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(PDF) Tropical forest and savanna ecosystems show differential impact of N and P additions on soil organic matter and aggregate structure
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The findings reveal that N and P enrichments significantly affect the composition of soil micro- and macroaggregates, enhancing microbial biomass and nutrient retention. The results underline the importance of nutrient management in maintaining soil health and ecosystem stability following land use changes.","publication_date":"2008,1,1","publication_name":"Global Change Biology"},"document_type":"paper","pre_hit_view_count_baseline":0,"quality":"high","language":"en","title":"Tropical forest and savanna ecosystems show differential impact of N and P additions on soil organic matter and aggregate structure","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [303957]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loginModal = {}; window.loginModal.appleClientId = 'edu.academia.applesignon'; window.userInChina = "false";</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":51349012,"attachmentType":"pdf"}"><img alt="First page of “Tropical forest and savanna ecosystems show differential impact of N and P additions on soil organic matter and aggregate structure”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/51349012/mini_magick20190125-12780-1hcs095.png?1548465379" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/images/single_work_splash/adobe_icon.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Tropical forest and savanna ecosystems show differential impact of N and P additions on soil organic matter and aggregate structure</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="303957" href="https://bhu-in.academia.edu/CPKushwaha"><img alt="Profile image of C P Kushwaha" class="ds-work-card--author-avatar" src="//a.academia-assets.com/images/s65_no_pic.png" />C P Kushwaha</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">2008, Global Change Biology</p><div class="ds-work-card--work-metadata"><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">visibility</span><p class="ds2-5-body-sm" id="work-metadata-view-count">…</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">description</span><p class="ds2-5-body-sm">11 pages</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">link</span><p class="ds2-5-body-sm">1 file</p></div></div><script>(async () => { const workId = 581838; const worksViewsPath = "/v0/works/views?subdomain_param=api&work_ids%5B%5D=581838"; const getWorkViews = async (workId) => { const response = await fetch(worksViewsPath); if (!response.ok) { throw new Error('Failed to load work views'); } const data = await response.json(); return data.views[workId]; }; // Get the view count for the work - we send this immediately rather than waiting for // the DOM to load, so it can be available as soon as possible (but without holding up // the backend or other resource requests, because it's a bit expensive and not critical). const viewCount = await getWorkViews(workId); const updateViewCount = (viewCount) => { try { const viewCountNumber = parseInt(viewCount, 10); if (viewCountNumber === 0) { // Remove the whole views element if there are zero views. document.getElementById('work-metadata-view-count')?.parentNode?.remove(); return; } const commaizedViewCount = viewCountNumber.toLocaleString(); const viewCountBody = document.getElementById('work-metadata-view-count'); if (!viewCountBody) { throw new Error('Failed to find work views element'); } viewCountBody.textContent = `${commaizedViewCount} views`; } catch (error) { // Remove the whole views element if there was some issue parsing. document.getElementById('work-metadata-view-count')?.parentNode?.remove(); throw new Error(`Failed to parse view count: ${viewCount}`, error); } }; // If the DOM is still loading, wait for it to be ready before updating the view count. if (document.readyState === "loading") { document.addEventListener('DOMContentLoaded', () => { updateViewCount(viewCount); }); // Otherwise, just update it immediately. } else { updateViewCount(viewCount); } })();</script></div><p class="ds-work-card--detail ds2-5-body-md">AI-generated Abstract</p><p class="ds-work-card--work-abstract ds-work-card--detail ds2-5-body-md">This study investigates the differential impacts of nitrogen (N) and phosphorus (P) additions on soil organic matter and aggregate structure across tropical forest and savanna ecosystems in Indian dry tropics. The findings reveal that N and P enrichments significantly affect the composition of soil micro- and macroaggregates, enhancing microbial biomass and nutrient retention. The results underline the importance of nutrient management in maintaining soil health and ecosystem stability following land use changes.</p><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":51349012,"attachmentType":"pdf","workUrl":"https://www.academia.edu/581838/Tropical_forest_and_savanna_ecosystems_show_differential_impact_of_N_and_P_additions_on_soil_organic_matter_and_aggregate_structure"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":51349012,"attachmentType":"pdf","workUrl":"https://www.academia.edu/581838/Tropical_forest_and_savanna_ecosystems_show_differential_impact_of_N_and_P_additions_on_soil_organic_matter_and_aggregate_structure"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div><div class="ds-signup-banner-trigger-container"><div class="ds-signup-banner-trigger ds-signup-banner-trigger-control"></div></div><div class="ds-signup-banner ds-signup-banner-control"><div id="ds-signup-banner-close-button"><button class="ds2-5-button ds2-5-button--secondary ds2-5-button--inverse"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">close</span></button></div><div class="ds-signup-banner-ctas"><img src="//a.academia-assets.com/images/academia-logo-capital-white.svg" /><h4 class="ds2-5-heading-serif-sm">Sign up for access to the world's latest research</h4><button class="ds2-5-button ds2-5-button--inverse ds2-5-button--full-width js-swp-download-button" data-signup-modal="{"location":"signup-banner"}">Sign up for free<span class="material-symbols-outlined" style="font-size: 20px" translate="no">arrow_forward</span></button></div><div class="ds-signup-banner-divider"></div><div class="ds-signup-banner-reasons"><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Get notified about relevant papers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Save papers to use in your research</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Join the discussion with peers</span></div><div class="ds-signup-banner-reasons-item"><span class="material-symbols-outlined" style="font-size: 24px" translate="no">check</span><span>Track your impact</span></div></div></div><script>(() => { // Set up signup banner show/hide behavior: // 1. 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Nutrient addition significantly increased aboveground plant biomass of herbs in these ecosystems. The fine root biomass responded positively to N addition with greater proportions in upper soil depth, whereas, P addition had little effect. Ammonification was dominant over nitrification in the forest and ecotone while the reverse was true in the savanna. Available nutrient status, N- mineralization rate and microbial biomass (C, N and P) were significantly affected by nutrient additions. Savanna ecosystem soil responded more rapidly to nutrient addition than the forest and ecotone. However, the responses were retained for a longer period in the forest and ecotone soils than in the savanna. It is concluded that when either N or P are added to tropical forest and savanna ecosystems the soil and plants attributes are affected differently depending on the amount and the quality of organic matter present in the soil. Contrary to the general belief, N addition seems to have more powerful control on the vegetation and soil nutrient dynamics than P addition in these ecosystems. Keywords: Nutrient addition, herbaceous composition, soil nutrients, dry tropical forests savanna ecosystems.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Nutrient addition effects on herbaceous composition and soil nutrient dynamics in Indian dry tropical forest and savanna ecosystems","attachmentId":31725018,"attachmentType":"pdf","work_url":"https://www.academia.edu/4243723/Nutrient_addition_effects_on_herbaceous_composition_and_soil_nutrient_dynamics_in_Indian_dry_tropical_forest_and_savanna_ecosystems","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/4243723/Nutrient_addition_effects_on_herbaceous_composition_and_soil_nutrient_dynamics_in_Indian_dry_tropical_forest_and_savanna_ecosystems"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="5596418" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/5596418/A_comparative_account_of_the_microbial_biomass_N_and_N_mineralization_of_soils_under_natural_forest_grassland_and_crop_field_from_dry_tropical_region_India">A comparative account of the microbial biomass-N and N-mineralization of soils under natural forest, grassland and crop field from dry tropical region, India.</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4964400" href="https://bbau.academia.edu/DrJayShankarSingh">Jay Shankar Singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Plant Soil and Environment, 55 (6): 223-230., 2009</p><p class="ds-related-work--abstract ds2-5-body-sm">This study investigated microbial biomass-N (MB-N) and N-mineralization in soils of four different vegetation systems including forest (sal), mixed forest, savanna and cropland ecosystems in the Vindhyan region, India. A change was noted in the above region due to physiographic differences and anthropogenic disturbances. Annually the soil moisture (SM) content across the different study sites ranged from 7.5 to 24.3% being maximum in forest sites compared to savanna and cropland sites. The NH 4 + -N, NO 3 --N and MB-N concentrations varied from 4.3 to 10.2 µg/g, 1.1 to 5.8 µg/g and 21.3 to 90.2 µg/g dry soil, respectively, with minimum values in the wet and maximum values in the dry season. The trend of seasonal variation in net N-mineralization was similar to that of moisture content but counter to the concentrations of inorganic-N and MB-N. The net N-mineralization rates at different investigated sites ranged from 4.5 to 37.6 µg/g month. Cultivation reduced the N-mineralization and MB-N by 58.5% and 63.5%, respectively. Experiments showed that the percentage contribution of MB-N to total-N was 8.01 to 19.15%. MB-N was positively correlated with the inorganic-N (n = 180, r = 0.80, p < 0.001) but negatively with soil moisture (n = 180, r = 0.79, p < 0.001) and net N-mineralization rates (n = 180, r = 0.92, p < 0.0001). The higher N-mineralization and MB-N in the soil of forest ecosystem was reported compared to savanna and cropland and the order of soil MB-N levels and net N-mineralization followed the sequence: forest (sal) > mixed forest > savanna > cropland.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"A comparative account of the microbial biomass-N and N-mineralization of soils under natural forest, grassland and crop field from dry tropical region, India.","attachmentId":32675948,"attachmentType":"pdf","work_url":"https://www.academia.edu/5596418/A_comparative_account_of_the_microbial_biomass_N_and_N_mineralization_of_soils_under_natural_forest_grassland_and_crop_field_from_dry_tropical_region_India","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/5596418/A_comparative_account_of_the_microbial_biomass_N_and_N_mineralization_of_soils_under_natural_forest_grassland_and_crop_field_from_dry_tropical_region_India"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="25191100" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/25191100/Dynamics_of_soil_biomass_C_N_and_P_in_a_dry_tropical_forest_in_India">Dynamics of soil biomass C, N, and P in a dry tropical forest in India</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="26760232" href="https://independent.academia.edu/AkhileshRaghubanshi">Akhilesh Raghubanshi</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Biology and Fertility of Soils, 1991</p><p class="ds-related-work--abstract ds2-5-body-sm">Three dry tropical forest soils along a topographic sequence were examined to determine the seasonal dynamics of microbial C, N, and P. The lowest microbial biomass was found in forest soils at the foot of the hill followed by midslope forest soils. The hilltop soil, which had the most fine particles, water-holding capacity, organic C, and total N, reflected the presence of greater amounts of microbial C, N, and P. Mean annual microbial C, N, and P ranges were 466-662, 48-72 to 21 -30 gg g-l, respectively. The seasonal pattern of microbial biomass, C, N, and P was similar at all sites, the values being greatest during the dry season and lowest during the wet season. The seasonal values for microbial biomass C, N, and P were positively correlated with each other and a negative correlation was found between microbial biomass and the fine root mass in these forest soils.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Dynamics of soil biomass C, N, and P in a dry tropical forest in India","attachmentId":45505492,"attachmentType":"pdf","work_url":"https://www.academia.edu/25191100/Dynamics_of_soil_biomass_C_N_and_P_in_a_dry_tropical_forest_in_India","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/25191100/Dynamics_of_soil_biomass_C_N_and_P_in_a_dry_tropical_forest_in_India"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="5595597" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/5595597/Microbial_Biomass_C_N_and_P_in_Disturbed_Dry_Tropical_Forest_Soils">Microbial Biomass C, N and P in Disturbed Dry Tropical Forest Soils</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4964400" href="https://bbau.academia.edu/DrJayShankarSingh">Jay Shankar Singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Pedosphere; 20(6): 780–788, 2010</p><p class="ds-related-work--abstract ds2-5-body-sm">Variations in microbial biomass C (MB-C), N (MB-N) and P (MB-P) along a gradient of different dominant vegetation covers (natural forest, mixed deciduous forest, disturbed savanna and grassland ecosystems) in dry tropical soils of Vindhyan Plateau, India were studied from January 2005 to December 2005. The water holding capacity, organic C, total N, total P and soil moisture content were comparatively higher in forest soils than in the savanna and grassland sites. Across different study sites the mean annual MB-C, MB-N and MB-P at 0-15 cm soil depth varied from 312.05 ± 4.22 to 653.40 ± 3.17, 32.16 ± 6.25 to 75.66 ± 7.21 and 18.94 ± 2.94 to 30.83 ± 23.08 μg g −1 dry soil, respectively. At all the investigated sites, the maximum MB-C, MB-N and MB-P occurred during the dry period (summer season) and the minimum in wet period (rainy season). In the present study, soil MB-C, MB-N and MB-P were higher at the forest sites compared to savanna and grassland sites. The differences in MB-C, MB-N and MB-P were significant (P < 0.001) among sites and seasons. The MB-C (P < 0.0001), MB-N (P < 0.001) and MB-P (P < 0.0001) were positively correlated with organic C, while the relationship between soil moisture and MB-C, MB-N and MB-P (P < 0.001, P < 0.01 and P < 0.0001, respectively) was negative. The decreasing order of MB-C, MB-N and MB-P along study ecosystems was natural forest > mixed deciduous forest > savanna > grassland. The results suggested that deforestation and land use practices (conversion of forest into savanna and grassland) caused the alterations in soil properties, which as a consequence, led to reduction in soil nutrients and MB-C, MB-N and MB-P in the soil of disturbed sites (grassland and savanna) compared to undisturbed forest ecosystems.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Microbial Biomass C, N and P in Disturbed Dry Tropical Forest Soils","attachmentId":32675389,"attachmentType":"pdf","work_url":"https://www.academia.edu/5595597/Microbial_Biomass_C_N_and_P_in_Disturbed_Dry_Tropical_Forest_Soils","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/5595597/Microbial_Biomass_C_N_and_P_in_Disturbed_Dry_Tropical_Forest_Soils"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="96608101" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/96608101/Temporal_change_in_soil_physicochemical_microbial_aggregate_and_available_C_characteristic_in_dry_tropical_ecosystem">Temporal change in soil physicochemical, microbial, aggregate and available C characteristic in dry tropical ecosystem</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="256817780" href="https://independent.academia.edu/RishikeshSingh66">Rishikesh Singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">CATENA, 2020</p><p class="ds-related-work--abstract ds2-5-body-sm">The holistic understanding of soil C dynamics with age of organic amendment is limited in dry tropical ecosystems, which may act as potential C sink if managed properly. Therefore, we studied soil physicochemical, microbial, aggregate and available C characteristic with age organic amendment across the season for mechanistic understanding of soil C accumulation. Organic systems under 1, 3, 5 and 10 years under organic amendment were selected along with a forest system as reference for this purpose. We observed that soil organic C and CO 2 efflux (SCE) increased significantly after ten years of organic amendment (though with no change in SCE on unit C basis), and approached closer to reference forest site. Soil fine particles, moisture content, ammonium-N, ammonium-N/nitrate-N ratio (ANR), microbial biomass C, N and C/N, crude dehydrogenase, glucosidase and phosphomonoesterase activity, macro-and mesoaggregate, mean weight diameter, macroaggregate water stability, and total and labile C concentration and carbon management index across aggregate fractions significantly increased with age. However, soil nitrate-N, C/N ratio, water soluble C, specific glucosidase and phosphomonoesterase activity, microaggregate and mineral fraction decreased. The seasonality of total and labile C concentration and stock differed distinctly across aggregate size fraction, which showed its linkage with microbial and plant C input dynamics. Though, total and labile C stock increased across aggregate fractions with age, it shifted towards macro-and mesoaggregate, opposite to smaller size fractions. Macro-aggregate stability along with macro-aggregate labile C, dehydrogenase activity, microbial biomass C/N and mesoaggregate C majorly determined the SOC. However, specific glucosidase activity along with mesoaggregate, ammonium/ nitrate ratio and microbial biomass majorly governed the SCE. The study indicates that macro-aggregate characteristic (including mesoaggregate) play a crucial role in soil C accumulation in dry tropical ecosystem under organic amendment, with microbial community characteristics and ANR. Moreover, the study indicates towards key role of macro-mesoaggregate equilibrium and inorganic N dynamics in the soil C dynamics of the studied ecosystems, in which seasonality and C input play a crucial role.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Temporal change in soil physicochemical, microbial, aggregate and available C characteristic in dry tropical ecosystem","attachmentId":98459597,"attachmentType":"pdf","work_url":"https://www.academia.edu/96608101/Temporal_change_in_soil_physicochemical_microbial_aggregate_and_available_C_characteristic_in_dry_tropical_ecosystem","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/96608101/Temporal_change_in_soil_physicochemical_microbial_aggregate_and_available_C_characteristic_in_dry_tropical_ecosystem"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="13107130" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/13107130/Soil_nitrogen_and_microbial_biomass_carbon_dynamics_in_native_forests_and_derived_agricultural_land_uses_in_a_humid_tropical_climate_of_India">Soil nitrogen and microbial biomass carbon dynamics in native forests and derived agricultural land uses in a humid tropical climate of India</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32358485" href="https://independent.academia.edu/sanjaysingh182">sanjay singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Plant and Soil, 2010</p><p class="ds-related-work--abstract ds2-5-body-sm">Conversion of tropical forests to agricultural land uses is known to alter soil nitrogen (N) transformation processes and microbial biomass carbon (MB-C ), which affect productivity and stability of the derived land uses. Information about how conversion of moist evergreen forest to agricultural land uses affects soil nitrogen (N) transformation processes and MB-C in hot humid tropics is meager. The present study explores the following questions: (1) how does conversion of native moist evergreen forest to agricultural production systems (grassland, home garden and silvopasture) affect net soil N mineralization rates, pools of mineral nitrogen (NH 4 + -N and NO 3 --N) and MB-C in the hot humid tropical climate of South Andaman, India and (2) are changes in soil N transformations and MB-C related to differences in soil moisture and temperature induced with forest conversion? Variations in net soil N mineralization, NH 4 + -N and NO 3 − -N pools, MB-C and soil temperature and moisture were measured across wet, post-wet and dry seasons at ten sites of each derived agricultural land use and native forest. In addition, inputs of carbon (C ) and N to the soils and outputs of C and N from the land use systems through harvests were also measured. We measured the N mineralization rate by the buried bag technique using 2 M KCl as an extractant. The NO 3 − -N and NH 4 + -N were measured at the beginning and end of incubation. The MB-C was measured by a chloroform fumigation-extraction method. We found that forest conversion resulted in a decline in carbon input, but caused rise in soil temperature (from 0.4 to 9.8% across the seasons) in derived agricultural land uses compared to native forest. The soil temperature increase was the highest in the grassland and lowest in the home garden. Across the three seasons, net soil N mineralization rates increased 27 to 55 % in the derived agricultural land uses compared to the native forest, with the increase highest in the grassland and lowest in the home garden. Soil organic C (SOC), MB-C, and NO 3 declined in the derived agricultural land uses relative to native forest, with the greatest effect again seen in the grassland. These observations suggest that native forest conversion to agricultural uses results in lower soil organic C content over time, due to increased mineralization rates stimulated by a rise in soil temperature, and that these soil changes may be most pronounced in grasslands. Therefore, tree based land uses offer good options for soil carbon build up and protection against N loss in the hot humid tropics.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Soil nitrogen and microbial biomass carbon dynamics in native forests and derived agricultural land uses in a humid tropical climate of India","attachmentId":45679433,"attachmentType":"pdf","work_url":"https://www.academia.edu/13107130/Soil_nitrogen_and_microbial_biomass_carbon_dynamics_in_native_forests_and_derived_agricultural_land_uses_in_a_humid_tropical_climate_of_India","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/13107130/Soil_nitrogen_and_microbial_biomass_carbon_dynamics_in_native_forests_and_derived_agricultural_land_uses_in_a_humid_tropical_climate_of_India"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="79182807" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/79182807/Increases_in_Soil_Aggregation_Following_Phosphorus_Additions_in_a_Tropical_Premontane_Forest_are_Not_Driven_by_Root_and_Arbuscular_Mycorrhizal_Fungal_Abundances">Increases in Soil Aggregation Following Phosphorus Additions in a Tropical Premontane Forest are Not Driven by Root and Arbuscular Mycorrhizal Fungal Abundances</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33121805" href="https://uni-goettingen.academia.edu/JHomeier">Jürgen Homeier</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Frontiers in Earth Science, 2016</p><p class="ds-related-work--abstract ds2-5-body-sm">Tropical ecosystems have an important role in global change scenarios, in part because they serve as a large terrestrial carbon pool. Carbon protection is mediated by soil aggregation processes, whereby biotic and abiotic factors influence the formation and stability of aggregates. Nutrient additions may affect soil structure indirectly by simultaneous shifts in biotic factors, mainly roots, and fungal hyphae, but also via impacts on abiotic soil properties. Here, we tested the hypothesis that soil aggregation will be affected by nutrient additions primarily via changes in arbuscular mycorrhizal fungal (AMF) hyphae and root length in a pristine tropical forest system. Therefore, the percentage of water-stable macroaggregates (> 250 µm) (WSA) and the soil mean weight diameter (MWD) was analyzed, as well as nutrient contents, pH, root length, and AMF abundance. Phosphorus additions significantly increased the amount of WSA, which was consistent across two different sampling times. Despite a positive effect of phosphorus additions on extra-radical AMF biomass, no relationship between WSA and extra-radical AMF nor roots was revealed by regression analyses, contrary to the proposed hypothesis. These findings emphasize the importance of analyzing soil structure in understudied tropical systems, since it might be affected by increasing nutrient deposition expected in the future.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Increases in Soil Aggregation Following Phosphorus Additions in a Tropical Premontane Forest are Not Driven by Root and Arbuscular Mycorrhizal Fungal Abundances","attachmentId":85984619,"attachmentType":"pdf","work_url":"https://www.academia.edu/79182807/Increases_in_Soil_Aggregation_Following_Phosphorus_Additions_in_a_Tropical_Premontane_Forest_are_Not_Driven_by_Root_and_Arbuscular_Mycorrhizal_Fungal_Abundances","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/79182807/Increases_in_Soil_Aggregation_Following_Phosphorus_Additions_in_a_Tropical_Premontane_Forest_are_Not_Driven_by_Root_and_Arbuscular_Mycorrhizal_Fungal_Abundances"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="6617370" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/6617370/Soil_aggregates_in_a_tropical_deciduous_forest_effects_on_C_and_N_dynamics_and_microbial_communities_as_determined_by_t_RFLPs">Soil aggregates in a tropical deciduous forest: effects on C and N dynamics, and microbial communities as determined by t-RFLPs</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="10705073" href="https://independent.academia.edu/FELIPEGARCIAMENDOZA">FELIPE GARCIA MENDOZA</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Biogeochemistry, 2008</p><p class="ds-related-work--abstract ds2-5-body-sm">The aim of this study was to analyze C and N dynamics, as well as, soil bacterial community structure within soil micro- and macro-aggregates in a tropical deciduous forest in México. We measured, for three landscape positions and three seasons of the year: total, microbial and available forms of C and N; potential C and N mineralization; and soil bacterial communities by using t-RFLPs. The highest total C concentrations were found in the north-slopes and in the dry season (DS) samples. In general, micro-aggregates had higher concentrations than macro-aggregates of available C and N forms, and microbial C. Similarly, micro-aggregates had the highest potential C mineralization and net N mineralization. We detected 149 different OTUs (operational taxonomic units) from which 50% was shared by the two aggregate size fractions, 25% was exclusive to micro-aggregates and the 25% left was found only in macro-aggregates. Top-hills were richer in OTUs than north and south-slopes. The Unweighted Pair Group Method with Arithmetic mean (UPGMA) analysis indicated clear differences in community composition between the two aggregate size-fractions in relation to the presence of OTUs. These results suggest that the main difference between micro- and macro-aggregates is due to the community structure within each soil fraction and this difference could affect soil nutrients dynamics.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Soil aggregates in a tropical deciduous forest: effects on C and N dynamics, and microbial communities as determined by t-RFLPs","attachmentId":48782252,"attachmentType":"pdf","work_url":"https://www.academia.edu/6617370/Soil_aggregates_in_a_tropical_deciduous_forest_effects_on_C_and_N_dynamics_and_microbial_communities_as_determined_by_t_RFLPs","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/6617370/Soil_aggregates_in_a_tropical_deciduous_forest_effects_on_C_and_N_dynamics_and_microbial_communities_as_determined_by_t_RFLPs"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="19267799" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/19267799/Phosphate_addition_enhanced_soil_inorganic_nutrients_to_a_large_extent_in_three_tropical_forests">Phosphate addition enhanced soil inorganic nutrients to a large extent in three tropical forests</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="39520925" href="https://independent.academia.edu/XiankaiLu">Xiankai Lu</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Scientific Reports, 2015</p><p class="ds-related-work--abstract ds2-5-body-sm">Elevated nitrogen (N) deposition may constrain soil phosphorus (P) and base cation availability in tropical forests, for which limited evidence have yet been available. In this study, we reported responses of soil inorganic nutrients to full factorial N and P treatments in three tropical forests different in initial soil N status (N-saturated old-growth forest and two less-N-rich younger forests). Responses of microbial biomass, annual litterfall production and nutrient input were also monitored. Results showed that N treatments decreased soil inorganic nutrients (except N) in all three forests, but the underlying mechanisms varied depending on forests: through inhibition on litter decomposition in the old-growth forest and through Al 31 replacement of Ca 21 in the two younger forests. In contrast, besides great elevation in soil available P, P treatments induced 60%, 50%, 26% increases in sum of exchangeable (K 1 1Ca 21 1Mg 21 ) in the old-growth and the two younger forests, respectively. These positive effects of P were closely related to P-stimulated microbial biomass and litter nutrient input, implying possible stimulation of nutrient return. Our results suggest that N deposition may result in decreases in soil inorganic nutrients (except N) and that P addition can enhance soil inorganic nutrients to support ecosystem processes in these tropical forests.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Phosphate addition enhanced soil inorganic nutrients to a large extent in three tropical forests","attachmentId":40526274,"attachmentType":"pdf","work_url":"https://www.academia.edu/19267799/Phosphate_addition_enhanced_soil_inorganic_nutrients_to_a_large_extent_in_three_tropical_forests","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/19267799/Phosphate_addition_enhanced_soil_inorganic_nutrients_to_a_large_extent_in_three_tropical_forests"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="27920439" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/27920439/Cultivation_impacts_soil_microbial_dynamics_in_dry_tropical_forest_ecosystem_in_India">Cultivation impacts soil microbial dynamics in dry tropical forest ecosystem in India</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="28856687" href="https://raj10webs.academia.edu/RajSSingh">Raj S. Singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Acta Ecologica Sinica, 2013</p><p class="ds-related-work--abstract ds2-5-body-sm">and sharing with colleagues.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Cultivation impacts soil microbial dynamics in dry tropical forest ecosystem in India","attachmentId":48215113,"attachmentType":"pdf","work_url":"https://www.academia.edu/27920439/Cultivation_impacts_soil_microbial_dynamics_in_dry_tropical_forest_ecosystem_in_India","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/27920439/Cultivation_impacts_soil_microbial_dynamics_in_dry_tropical_forest_ecosystem_in_India"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":51349012,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":51349012,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_51349012" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="17193596" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/17193596/Influence_of_different_land_uses_on_soil_nitrogen_transformations_after_conversion_from_an_Indian_dry_tropical_forest">Influence of different land uses on soil nitrogen transformations after conversion from an Indian dry tropical forest</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="36653961" href="https://independent.academia.edu/rajsingh218">raj singh</a></div><p class="ds-related-work--metadata ds2-5-body-xs">CATENA, 2009</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Influence of different land uses on soil nitrogen transformations after conversion from an Indian dry tropical forest","attachmentId":39383433,"attachmentType":"pdf","work_url":"https://www.academia.edu/17193596/Influence_of_different_land_uses_on_soil_nitrogen_transformations_after_conversion_from_an_Indian_dry_tropical_forest","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/17193596/Influence_of_different_land_uses_on_soil_nitrogen_transformations_after_conversion_from_an_Indian_dry_tropical_forest"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="1" data-entity-id="542909" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/542909/Changes_in_microbial_community_characteristics_and_soil_organic_matter_with_nitrogen_additions_in_two_tropical_forests">Changes in microbial community characteristics and soil organic matter with nitrogen additions in two tropical forests</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="55348" href="https://colostate.academia.edu/DanielaCusack">Daniela Cusack</a><span>, </span><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="36837885" href="https://independent.academia.edu/SarahBurton6">Sarah Burton</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Ecology</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Changes in microbial community characteristics and soil organic matter with nitrogen additions in two tropical forests","attachmentId":2715081,"attachmentType":"pdf","work_url":"https://www.academia.edu/542909/Changes_in_microbial_community_characteristics_and_soil_organic_matter_with_nitrogen_additions_in_two_tropical_forests","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/542909/Changes_in_microbial_community_characteristics_and_soil_organic_matter_with_nitrogen_additions_in_two_tropical_forests"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="2" data-entity-id="14487271" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/14487271/Integrated_Soil_Fertility_Management_Aggregate_carbon_and_nitrogen_stabilization_in_differently_textured_tropical_soils">Integrated Soil Fertility Management: Aggregate carbon and nitrogen stabilization in differently textured tropical soils</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33433018" href="https://ethz.academia.edu/JohanSix">Johan Six</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Soil Biology and Biochemistry, 2013</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Integrated Soil Fertility Management: Aggregate carbon and nitrogen stabilization in differently textured tropical soils","attachmentId":44117299,"attachmentType":"pdf","work_url":"https://www.academia.edu/14487271/Integrated_Soil_Fertility_Management_Aggregate_carbon_and_nitrogen_stabilization_in_differently_textured_tropical_soils","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download 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class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="43973895" href="https://independent.academia.edu/ShriKantTripathi2">Shri Kant Tripathi</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Applied Soil Ecology, 2001</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Soil organic matter and water-stable aggregates under different tillage and residue conditions in a tropical dryland agroecosystem","attachmentId":47157707,"attachmentType":"pdf","work_url":"https://www.academia.edu/26893585/Soil_organic_matter_and_water_stable_aggregates_under_different_tillage_and_residue_conditions_in_a_tropical_dryland_agroecosystem","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span 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