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<!DOCTYPE html><html><head><meta charSet="utf-8"/><meta name="viewport" content="width=device-width"/><link rel="canonical" href=""/><title>Forest margins may be more resilient to climate change than previously thought | Penn State University</title><meta name="title" content="Forest margins may be more resilient to climate change than previously thought | Penn State University" data-testid="title"/><meta name="description" content="A warming climate and more frequent wildfires do not necessarily mean the western United States will see the forest loss that many scientists expect. Dry forest margins may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers." data-testid="description"/><meta name="abstract" content="A warming climate and more frequent wildfires do not necessarily mean the western United States will see the forest loss that many scientists expect. Dry forest margins may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers." data-testid="abstract"/><meta name="robots" content="noodp, noydir" data-testid="robots"/><meta property="og:type" content="article" data-testid="og:type"/><meta property="og:title" content="Forest margins may be more resilient to climate change than previously thought | Penn State University" data-testid="og:title"/><meta property="og:description" content="A warming climate and more frequent wildfires do not necessarily mean the western United States will see the forest loss that many scientists expect. Dry forest margins may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers." data-testid="og:description"/><meta property="og:image" content="https://psu-gatsby-files-prod.s3.amazonaws.com/s3fs-public/styles/16_9_1000w/public/Eastern%20Sierra%20Nevada%20-%20Harris2.jpg?h=b8bfb7d8&itok=v-5GPFYA" data-testid="og:image"/><link rel="alternate" type="application/rss+xml" href="/news/rss/rss.xml"/><meta name="next-head-count" content="13"/><style type="text/css">.fresnel-container{margin:0;padding:0;} @media not all and (min-width:0px) and (max-width:767.98px){.fresnel-at-xs{display:none!important;}} @media not all and (min-width:768px) and (max-width:999.98px){.fresnel-at-sm{display:none!important;}} @media not all and (min-width:1000px) and (max-width:1199.98px){.fresnel-at-md{display:none!important;}} @media not all and (min-width:1200px){.fresnel-at-lg{display:none!important;}} @media not all and 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src="https://psu-gatsby-files-prod.s3.amazonaws.com/s3fs-public/Eastern%20Sierra%20Nevada%20-%20Harris2.jpg" srcSet="" sizes="(min-width: 1080px) 1092px, 95vw" alt="A forest margin of the eastern Sierra Nevada Mountains, California." data-testid="image" id="article-image-click"/></button><figcaption id="caption" class="caption_caption__NUVUU article-hero-image_caption__M94xx" data-testid="caption"><div class="caption_wrapper__TvVG_"><div class="caption_captionContentWrapper__DBIP0 caption-background"><div class="caption_captionContent__ooqwN"><p><span>Dry forest margins in the western United States may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers. The researchers studied forest regeneration at four sites that had experienced wildfires in the eastern Sierra Nevada Mountains in California. The sites sit at the forest margin, a drier area where forest meets sagebrush grassland and which may be the most vulnerable to climate change-driven forest loss.</span> <span class="caption_captionCredit___hoK5" data-testid="credit">Credit: Lucas Harris / Penn State. All Rights Reserved.</span></p></div></div><button id="article-caption-expand">Expand</button></div></figcaption></figure><div class="article-top-social-share_outer__tYbND"><div class="article-top-social-share_inner__hHyrG"><div class="article-top-social-share_articleTopGrid__uFbzB"><p class="article-top-social-share_publishDate__TX0Gj">September 21, 2020</p><p class="article-top-social-share_authorName__Ob6EX">By Francisco Tutella</p><div data-testid="addthis-widget" class="article-top-social-share_socialShare__GyAms"><div class="article-top-social-share_content__OYcDe article-top-social-share_inline__kSd0u"><button id="main-facebook" aria-label="facebook" class="react-share__ShareButton article-top-social-share_socialButton__Wi8LM article-top-social-share_inline__kSd0u" style="background-color:transparent;border:none;padding:0;font:inherit;color:inherit;cursor:pointer"><svg viewBox="0 0 64 64" width="64" height="64"><rect width="64" height="64" rx="0" ry="0" fill="#3b5998"></rect><path d="M34.1,47V33.3h4.6l0.7-5.3h-5.3v-3.4c0-1.5,0.4-2.6,2.6-2.6l2.8,0v-4.8c-0.5-0.1-2.2-0.2-4.1-0.2 c-4.1,0-6.9,2.5-6.9,7V28H24v5.3h4.6V47H34.1z" fill="white"></path></svg></button><button id="main-twitter" aria-label="twitter" class="react-share__ShareButton article-top-social-share_socialButton__Wi8LM article-top-social-share_inline__kSd0u" style="background-color:transparent;border:none;padding:0;font:inherit;color:inherit;cursor:pointer"><svg viewBox="0 0 64 64" width="64" height="64"><rect width="64" height="64" rx="0" ry="0" fill="#00aced"></rect><path d="M48,22.1c-1.2,0.5-2.4,0.9-3.8,1c1.4-0.8,2.4-2.1,2.9-3.6c-1.3,0.8-2.7,1.3-4.2,1.6 C41.7,19.8,40,19,38.2,19c-3.6,0-6.6,2.9-6.6,6.6c0,0.5,0.1,1,0.2,1.5c-5.5-0.3-10.3-2.9-13.5-6.9c-0.6,1-0.9,2.1-0.9,3.3 c0,2.3,1.2,4.3,2.9,5.5c-1.1,0-2.1-0.3-3-0.8c0,0,0,0.1,0,0.1c0,3.2,2.3,5.8,5.3,6.4c-0.6,0.1-1.1,0.2-1.7,0.2c-0.4,0-0.8,0-1.2-0.1 c0.8,2.6,3.3,4.5,6.1,4.6c-2.2,1.8-5.1,2.8-8.2,2.8c-0.5,0-1.1,0-1.6-0.1c2.9,1.9,6.4,2.9,10.1,2.9c12.1,0,18.7-10,18.7-18.7 c0-0.3,0-0.6,0-0.8C46,24.5,47.1,23.4,48,22.1z" fill="white"></path></svg></button><button id="main-linkedin" aria-label="linkedin" class="react-share__ShareButton article-top-social-share_socialButton__Wi8LM article-top-social-share_inline__kSd0u" style="background-color:transparent;border:none;padding:0;font:inherit;color:inherit;cursor:pointer"><svg viewBox="0 0 64 64" width="64" height="64"><rect width="64" height="64" rx="0" ry="0" fill="#007fb1"></rect><path d="M20.4,44h5.4V26.6h-5.4V44z M23.1,18c-1.7,0-3.1,1.4-3.1,3.1c0,1.7,1.4,3.1,3.1,3.1 c1.7,0,3.1-1.4,3.1-3.1C26.2,19.4,24.8,18,23.1,18z M39.5,26.2c-2.6,0-4.4,1.4-5.1,2.8h-0.1v-2.4h-5.2V44h5.4v-8.6 c0-2.3,0.4-4.5,3.2-4.5c2.8,0,2.8,2.6,2.8,4.6V44H46v-9.5C46,29.8,45,26.2,39.5,26.2z" fill="white"></path></svg></button><button id="main-email" aria-label="email" class="react-share__ShareButton article-top-social-share_socialButton__Wi8LM article-top-social-share_inline__kSd0u" style="background-color:transparent;border:none;padding:0;font:inherit;color:inherit;cursor:pointer"><svg viewBox="0 0 64 64" width="64" height="64"><rect width="64" height="64" rx="0" ry="0" fill="#7f7f7f"></rect><path d="M17,22v20h30V22H17z M41.1,25L32,32.1L22.9,25H41.1z M20,39V26.6l12,9.3l12-9.3V39H20z" fill="white"></path></svg></button><button class="article-top-social-share_printButton__EXFYY article-top-social-share_socialButton__Wi8LM article-top-social-share_inline__kSd0u" id="main-print"><svg xmlns="http://www.w3.org/2000/svg" aria-labelledby="at-svg-print-4" class="icon--print_inline_svg__at-icon icon--print_inline_svg__at-icon-print" style="fill:#fff;width:32px;height:32px" viewBox="0 0 32 32"><path d="M24.67 10.62h-2.86V7.49H10.82v3.12H7.95c-.5 0-.9.4-.9.9v7.66h3.77v1.31L15 24.66h6.81v-5.44h3.77v-7.7c-.01-.5-.41-.9-.91-.9zM11.88 8.56h8.86v2.06h-8.86V8.56zm10.98 9.18h-1.05v-2.1h-1.06v7.96H16.4c-1.58 0-.82-3.74-.82-3.74s-3.65.89-3.69-.78v-3.43h-1.06v2.06H9.77v-3.58h13.09v3.61zm.75-4.91c-.4 0-.72-.32-.72-.72s.32-.72.72-.72c.4 0 .72.32.72.72s-.32.72-.72.72zm-4.12 2.96h-6.1v1.06h6.1v-1.06zm-6.11 3.15h6.1v-1.06h-6.1v1.06z"></path></svg></button></div></div></div></div></div><div class="basic-story_paragraphContainer__TWxF3"><div class="text-content_outer__fxYfg text-intro"><div class="text-content_inner__OK4E9"><div class="text-content_textContent__f06k1"><div id="text-content-container"><p>UNIVERSITY PARK, Pa. – A warming climate and more frequent wildfires do not necessarily mean the western United States will see the forest loss that many scientists expect. Dry forest margins may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers.</p> <p>“The basic narrative is it’s just a matter of time before we lose these dry, low elevation forests,” said Lucas Harris, a postdoctoral scholar who worked on the project as part of his doctoral dissertation. “There’s increasing evidence that once disturbances like drought or wildfire remove the canopy and shrub cover in these dry forests, the trees have trouble coming back. On the other hand, there’s growing evidence that there’s a lot of spatial variability in how resilient these forests are to disturbances and climate change.”</p> <p>The researchers studied forest regeneration at four sites that had experienced wildfires in the eastern Sierra Nevada Mountains in California. The sites sit at the forest margin, a drier area where forest meets sagebrush grassland. These dry forest margins may be the most vulnerable to climate change-driven forest loss, according to the researchers.</p> <p>Large fires in the area tend to consume the forest starting from the steppe margin then sweeping up the mountain, said Alan Taylor, professor of geography and ecology who has worked in the area for decades.</p> <p>“You wouldn’t see forest anymore over 10 or 20 years, and it seemed like the lower forest margin was getting pushed way up in elevation because it’s so dry near the sagebrush boundary,” Taylor said. “My research group wanted to look at this in detail because no one had actually done it.”</p> <p>Harris and Taylor’s research team measured tree diameters and litter depth, counted the number of seedlings and saplings and identified tree species at the research sites. They also quantified fire severity, the amount of moisture available for plant growth and water deficit, an indicator of drought intensity. They then fed the data into five models to see how the probability for tree regeneration varied based on fire severity, climate and location, and remaining vegetation and canopy cover. They report their results today (Sept. 21) in <a href="https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecs2.3258">Ecosphere</a>.</p> </div></div></div></div><div class="carousel article-gallery_carousel__IBeYm" data-testid="article-image-gallery"><div class="article-gallery_inner__QMhJw"><button class="article-gallery_button__PHRVt article-gallery_buttonBack__mM9ol" style="top:0px" id="image-gallery-next"><svg xmlns="http://www.w3.org/2000/svg" width="47" height="47"><g stroke="#FFF"><path fill="#FFF" stroke-width="0.5" d="m19.559 24.072 7.3-7.3a1.38 1.38 0 1 0-1.949-1.944l-8.276 8.27a1.377 1.377 0 0 0-.04 1.9l8.31 8.33a1.38 1.38 0 1 0 1.954-1.948Z"></path><path fill="none" stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M45.5 23.5a22 22 0 1 1-22-22 22 22 0 0 1 22 22Z"></path></g></svg></button><div class="article-gallery_tray__mT2Ep"><div class="horizontalSlider___281Ls carousel__slider carousel__slider--horizontal article-gallery_slider__Z3hI2" aria-live="polite" aria-label="slider" tabindex="-1" role="" id="slider_element"><div class="carousel__slider-tray-wrapper carousel__slider-tray-wrap--horizontal"><div class="sliderTray___-vHFQ sliderAnimation___300FY carousel__slider-tray carousel__slider-tray--horizontal article-gallery_sliderTrayCount2__9DgD5" style="display:flex;align-items:stretch;width:0%;transform:translateX(NaN%) translateX(0px);flex-direction:row" role="listbox" aria-label="gallery"><div tabindex="-1" aria-selected="true" aria-label="slide" role="option" class="slide___3-Nqo slideHorizontal___1NzNV carousel__slide article-gallery__visible carousel__slide--visible article-gallery_slide__2iLNN" style="width:Infinity%;padding-bottom:unset;height:unset" id="0"><div class="slideInner___2mfX9 carousel__inner-slide" style="position:unset"><figure itemscope="" itemType="http://schema.org/ImageObject" class="article-gallery-image_articleGalleryImage__kFX8s article-gallery-image_disabledImage__QrZnb disabled" data-testid="article-image-gallery-image"><button class="article-gallery-image_imageButton__BEFzG" tabindex="-1" disabled=""><div class="article-gallery-image_imageOverlay__bEADH image-overlay"></div><img itemProp="contentUrl" class="article-gallery-image_image__rjja4 image_image__VjCRd" loading="lazy" srcSet="" sizes="(min-width: 1080px) 644px, 95vw" data-testid="image" id="article-image-click"/></button></figure></div></div><div tabindex="-1" aria-selected="false" aria-label="slide" role="option" class="slide___3-Nqo slideHorizontal___1NzNV carousel__slide article-gallery_hiddenSlide__1weRM carousel__slide--hidden article-gallery_slide__2iLNN" style="width:Infinity%;padding-bottom:unset;height:unset" id="1"><div class="slideInner___2mfX9 carousel__inner-slide" style="position:unset"><figure itemscope="" itemType="http://schema.org/ImageObject" class="article-gallery-image_articleGalleryImage__kFX8s article-gallery-image_disabledImage__QrZnb disabled" data-testid="article-image-gallery-image"><button class="article-gallery-image_imageButton__BEFzG" tabindex="-1" disabled=""><div class="article-gallery-image_imageOverlay__bEADH image-overlay"></div><img itemProp="contentUrl" class="article-gallery-image_image__rjja4 image_image__VjCRd" loading="lazy" srcSet="" sizes="(min-width: 1080px) 644px, 95vw" data-testid="image" id="article-image-click"/></button></figure></div></div></div></div></div></div><button class="article-gallery_button__PHRVt article-gallery_buttonNext__n3Y6w" style="top:0px" id="image-gallery-next"><svg xmlns="http://www.w3.org/2000/svg" width="47" height="47"><g stroke="#FFF"><path fill="#FFF" stroke-width="0.5" d="m27.442 24.072-7.3-7.3a1.38 1.38 0 1 1 1.949-1.944l8.276 8.27a1.377 1.377 0 0 1 .04 1.9l-8.31 8.33a1.38 1.38 0 0 1-1.954-1.948Z"></path><path fill="none" stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M1.5 23.5a22 22 0 1 0 22-22 22 22 0 0 0-22 22Z"></path></g></svg></button></div></div><div class="text-content_outer__fxYfg text-intro"><div class="text-content_inner__OK4E9"><div class="text-content_textContent__f06k1"><div id="text-content-container"><p>The researchers found that 50% of the plots at the sites showed signs of tree regeneration, and water balance projections through the end of the current century indicate that there will be enough moisture available to support tree seedlings. The key is to prevent severe fire disturbances through proper management, according to the researchers, because tree regeneration was strongly associated with mature trees that survived fires.</p> <p>“In these marginal or dry forest areas, management approaches like prescribed burning or fuel treatments that thin the forest can prevent the severe fires that would push this ecosystem to a non-forest condition,” said Taylor, who also holds an appointment in the Earth and Environmental Systems Institute. “The study suggests that these low-severity disturbances could actually create very resilient conditions in places where most people have been suggesting that we’ll see forest loss.”</p> <p>The researchers also noticed a shift in tree composition from fire-resistant yellow pines to less fire-resistant but more drought-resistant species like pinyon pine. They attributed the shift to drying and fire exclusion policies in effect over the last century.</p> <p>“The shift could be beneficial if the species moving in is better suited to present and near-future climates,” said Harris. “However, it could be dangerous if a bunch of fire-sensitive species move into a place and then it all burns up. Many trees would die, and we could see lasting forest loss.”</p> <p>California’s climate is projected to warm, but many climate models also forecast an average increase in winter precipitation, especially in the northern part of the state and in the mountains, continued Harris.</p> <p>“On the one hand, you have greater drought intensity for sure, but also you’re going to have these wetter periods where there’s more moisture available for tree growth in the spring and maybe into the early summer,” he said. “So if the trees are able to survive that drought stress and take advantage of the additional moisture present in some years, they might be able to maintain or even expand their distribution.”</p> <p>This forest system is important for recreation, carbon storage, biodiversity and wildlife habitat, said Taylor. It also comprises part of the western side of the Great Basin, the largest area of contiguous watersheds that do not empty into an ocean in North America.</p> <p>“There’s not much forest in the Great Basin, which is a huge area of sagebrush grassland in Utah, Idaho, Oregon, Nevada and Arizona,” Taylor said. “So the forests of the eastern Sierra Nevada Mountains represent a significant component of the forest found in that system.”</p> <p>The National Science Foundation and Penn State, through a Center for Landscape Dynamics research award and a Ruby S. Miller Graduate Student Fellowship, funded this study. Marilyn Fogel, emerita professor in Earth and environmental sciences, University of California, Riverside, provided support for an undergraduate student conducting field work on the project.</p> </div></div></div></div></div><div class="basic-story_updatedContainer__fKQ60"><div class="basic-story_updated__EkcOf">Last Updated October 27, 2020</div></div><section class="media-contact-list_container__1uep6"><h3 class="media-contact-list_title__hpRtk">Contacts</h3><ul class="media-contact-list_list__FrkOp" data-testid="contacts"><li class="media-contact-list_contact__0yNSI"><div class="media-contact_contactGrid__7Sb7R"><ul class="media-contact_list__o2Db4"><li class="media-contact_listItem__uLkAF"><a data-link-type="nextjs" class="media-contact_itemLink__oc9dw" href="mailto:aem1@psu.edu">aem1@psu.edu</a></li><li class="media-contact_listItem__uLkAF">Cell Phone: <a data-link-type="nextjs" class="media-contact_itemLink__oc9dw" href="tel:814-865-9481">814-865-9481</a></li><li 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researchers found that 50% of the plots at the sites showed signs of tree regeneration, and water balance projections through the end of the current century indicate that there will be enough moisture available to support tree seedlings. The key is to prevent severe fire disturbances through proper management, according to the researchers, because tree regeneration was strongly associated with mature trees that survived fires.\u003c/p\u003e\n\u003cp\u003e“In these marginal or dry forest areas, management approaches like prescribed burning or fuel treatments that thin the forest can prevent the severe fires that would push this ecosystem to a non-forest condition,” said Taylor, who also holds an appointment in the Earth and Environmental Systems Institute. “The study suggests that these low-severity disturbances could actually create very resilient conditions in places where most people have been suggesting that we’ll see forest loss.”\u003c/p\u003e\n\u003cp\u003eThe researchers also noticed a shift in tree composition from fire-resistant yellow pines to less fire-resistant but more drought-resistant species like pinyon pine. They attributed the shift to drying and fire exclusion policies in effect over the last century.\u003c/p\u003e\n\u003cp\u003e“The shift could be beneficial if the species moving in is better suited to present and near-future climates,” said Harris. “However, it could be dangerous if a bunch of fire-sensitive species move into a place and then it all burns up. Many trees would die, and we could see lasting forest loss.”\u003c/p\u003e\n\u003cp\u003eCalifornia’s climate is projected to warm, but many climate models also forecast an average increase in winter precipitation, especially in the northern part of the state and in the mountains, continued Harris.\u003c/p\u003e\n\u003cp\u003e“On the one hand, you have greater drought intensity for sure, but also you’re going to have these wetter periods where there’s more moisture available for tree growth in the spring and maybe into the early summer,” he said. “So if the trees are able to survive that drought stress and take advantage of the additional moisture present in some years, they might be able to maintain or even expand their distribution.”\u003c/p\u003e\n\u003cp\u003eThis forest system is important for recreation, carbon storage, biodiversity and wildlife habitat, said Taylor. It also comprises part of the western side of the Great Basin, the largest area of contiguous watersheds that do not empty into an ocean in North America.\u003c/p\u003e\n\u003cp\u003e“There’s not much forest in the Great Basin, which is a huge area of sagebrush grassland in Utah, Idaho, Oregon, Nevada and Arizona,” Taylor said. “So the forests of the eastern Sierra Nevada Mountains represent a significant component of the forest found in that system.”\u003c/p\u003e\n\u003cp\u003eThe National Science Foundation and Penn State, through a Center for Landscape Dynamics research award and a Ruby S. Miller Graduate Student Fellowship, funded this study. Marilyn Fogel, emerita professor in Earth and environmental sciences, University of California, Riverside, provided support for an undergraduate student conducting field work on the project.\u003c/p\u003e\n","parentTypeName":"node--story"}],"hero":{"type":"paragraph--image_gallery","id":"d6e7c1fa-bd42-4442-a0e1-9bfc7628a5d6","links":{"self":{"href":"https://sc-cms.psu.edu/jsonapi/paragraph/image_gallery/d6e7c1fa-bd42-4442-a0e1-9bfc7628a5d6?resourceVersion=id%3A1283691"}},"resourceIdObjMeta":{"targetRevisionId":1283691,"drupalInternalTargetId":1283066},"relationshipNames":["field_images"],"backgroundColor":null,"title":null,"images":[{"type":"paragraph--image","id":"9b5ee7af-049d-43c1-aaff-677a69a2c205","links":{"self":{"href":"https://sc-cms.psu.edu/jsonapi/paragraph/image/9b5ee7af-049d-43c1-aaff-677a69a2c205?resourceVersion=id%3A1283666"}},"resourceIdObjMeta":{"targetRevisionId":1283666,"drupalInternalTargetId":1283041},"relationshipNames":["field_image"],"captionOverride":null,"heroImagePosition":null,"image":{"type":"media--image","id":"4b05d430-63b0-430a-872c-dc04a5f4ec8f","name":"Eastern Sierra Nevada Mountains 1","created":"2020-08-13T16:43:46+00:00","changed":"2020-09-21T19:21:40+00:00","links":{"self":{"href":"https://sc-cms.psu.edu/jsonapi/media/image/4b05d430-63b0-430a-872c-dc04a5f4ec8f?resourceVersion=id%3A476531"}},"resourceIdObjMeta":{"drupalInternalTargetId":476531},"relationshipNames":["field_image","field_terms"],"drupalInternalMid":476531,"publishOn":null,"unpublishOn":null,"publishState":null,"unpublishState":null,"caption":"\u003cp\u003eDry forest margins in the western United States may be more resilient to climate change than previously thought if managed appropriately, according to Penn State researchers. 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