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Effectiveness of forest density reduction treatments for increasing drought resistance of ponderosa pine growth.
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- Author(s): Young, Derek J. N.1 (AUTHOR) ; Estes, Becky L.2 (AUTHOR); Gross, Shana2 (AUTHOR); Wuenschel, Amarina2 (AUTHOR); Restaino, Christina3 (AUTHOR); Meyer, Marc D.2 (AUTHOR)
- Source:
Ecological Applications. Jun2023, Vol. 33 Issue 4, p1-14. 14p.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: As the climate changes, it is increasingly important to understand how forests will respond to drought and how forest management can influence those outcomes. In many forests that have become unnaturally dense, "restoration treatments," which decrease stand density using fire and/or mechanical thinning, are generally associated with reduced mortality during drought. However, the effects of such treatments on tree growth during drought are less clear. Previous studies have yielded apparently contradictory results, which may stem from differences in underlying aridity or drought intensity across studies. To address this uncertainty, we studied the growth of ponderosa pine (Pinus ponderosa) in paired treated and untreated areas before and during the extreme California drought of 2012–2016. Our study spanned gradients in climate and tree size and found that density reduction treatments could completely ameliorate drought‐driven declines in growth under some contexts, specifically in more mesic areas and in medium‐sized trees (i.e., normal annual precipitation > ca. 1100 mm and tree diameter at breast height < ca. 65 cm). Treatments were much less effective in ameliorating drought‐associated growth declines in the most water‐limited sites and largest trees, consistent with underlying ecophysiology. In medium‐sized trees and wetter sites, growth of trees in untreated stands decreased by more than 15% during drought, while treatment‐associated increases in growth of 25% or more persisted during the drought. Trees that ultimately died due to drought showed greater growth reductions during drought relative to trees that survived. Our results suggest that density reduction treatments can increase tree resistance to water stress, and they highlight an important pathway for treatments to influence carbon sequestration and other ecosystem services beyond mitigating tree mortality. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Ecological Applications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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