globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13704
论文题名:
Vulnerability to forest loss through altered postfire recovery dynamics in a warming climate in the Klamath Mountains
作者: Tepley A.J.; Thompson J.R.; Epstein H.E.; Anderson-Teixeira K.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:10
起始页码: 4117
结束页码: 4132
语种: 英语
英文关键词: Douglas-fir ; forest resilience ; Klamath Mountains ; postfire recruitment ; propagule pressure ; reburn ; stem analysis ; tipping point ; tree regeneration
Scopus关键词: Coniferophyta ; Pseudotsuga ; Pseudotsuga menziesii
英文摘要: In the context of ongoing climatic warming, certain landscapes could be near a tipping point where relatively small changes to their fire regimes or their postfire forest recovery dynamics could bring about extensive forest loss, with associated effects on biodiversity and carbon-cycle feedbacks to climate change. Such concerns are particularly valid in the Klamath Region of northern California and southwestern Oregon, where severe fire initially converts montane conifer forests to systems dominated by broadleaf trees and shrubs. Conifers eventually overtop the competing vegetation, but until they do, these systems could be perpetuated by a cycle of reburning. To assess the vulnerability of conifer forests to increased fire activity and altered forest recovery dynamics in a warmer, drier climate, we characterized vegetation dynamics following severe fire in nine fire years over the last three decades across the climatic aridity gradient of montane conifer forests. Postfire conifer recruitment was limited to a narrow window, with 89% of recruitment in the first 4 years, and height growth tended to decrease as the lag between the fire year and the recruitment year increased. Growth reductions at longer lags were more pronounced at drier sites, where conifers comprised a smaller portion of live woody biomass. An interaction between seed-source availability and climatic aridity drove substantial variation in the density of regenerating conifers. With increasing climatic water deficit, higher propagule pressure (i.e., smaller patch sizes for high-severity fire) was needed to support a given conifer seedling density, which implies that projected future increases in aridity could limit postfire regeneration across a growing portion of the landscape. Under a more severe prospective warming scenario, by the end of the century more than half of the area currently capable of supporting montane conifer forest could become subject to minimal conifer regeneration in even moderate-sized (10s of ha) high-severity patches. © 2017 John Wiley & Sons Ltd
资助项目: We are thankful to Chris So, Matthew Davis, Eleanor Pearson, Lily Clarke, Charles Maxwell, Kim Hack, and Dunbar Carpenter for assistance in the field. Bella Reyes, Mary McCabe, Christopher Fernandez, Olivia Christopher, Kate Aldrich, Ruth Cumberland, Thomas Blair, Anna Rollosson, and Maria Wang helped with sample preparation. Rob Pabst, Jeff Shatford, Tom Spies, Carl Skinner, Dan Blessing, Ken Wearstler, Todd Drake, and Patricia Hochhalter provided feedback and logistical support for the field work. Luca Morreale assisted with the climatic water-deficit layers. Jean-Daniel Bontemps provided feedback on the growth models. We are thankful to three anonymous reviewers for their valuable comments. Funding was provided by NSF grant #DEB-1353301.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60776
Appears in Collections:影响、适应和脆弱性

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作者单位: Smithsonian Conservation Biology Institute, Front Royal, VA, United States; Harvard Forest, Petersham, MA, United States; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States; Center for Tropical Forest Science – Forest Global Earth Observatory, Smithsonian Tropical Research Institute, Panama, Panama

Recommended Citation:
Tepley A.J.,Thompson J.R.,Epstein H.E.,et al. Vulnerability to forest loss through altered postfire recovery dynamics in a warming climate in the Klamath Mountains[J]. Global Change Biology,2017-01-01,23(10)
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