气候变化领域集成服务门户(CCPortal): California forest die-off linked to multi-year deep soil drying in 2012

CCPortal

DOI	10.1038/s41561-019-0388-5
	California forest die-off linked to multi-year deep soil drying in 2012–2015 drought
	Goulden M.L.; Bales R.C.
发表日期	2019
ISSN	17520894
卷号	12 期号:8
英文摘要	Widespread episodes of recent forest die-off have been tied to the occurrence of anomalously warm droughts, although the underlying mechanisms remain inadequately understood. California’s 2012–2015 drought, with exceptionally low precipitation and warmth, and widespread conifer death, provides an opportunity to explore the chain of events leading to forest die-off. Here, we present the spatial and temporal patterns of die-off and moisture deficit during California’s drought, based on field and remote sensing observations. We found that die-off was closely tied to multi-year deep-rooting-zone drying, and that this relationship provides a framework with which to diagnose and predict mortality. Marked tree death in an intensively studied Sierra Nevada forest followed a four-year moisture overdraft, with cumulative 2012–2015 evapotranspiration exceeding precipitation by ~1,500 mm, and subsurface moisture exhaustion to 5–15-m depth. Observations across the entire Sierra Nevada further linked tree death to deep drying, with die-off and moisture overdraft covarying across latitude and elevation. Unusually dense vegetation and warm temperatures accelerated southern Sierran evapotranspiration in 2012–2015, intensifying overdraft and compounding die-off by an estimated 55%. Climate change is expected to further amplify evapotranspiration and moisture overdraft during drought, potentially increasing Sierran tree death during drought by ~15–20% °C−1. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	climate change; coniferous forest; drought; evapotranspiration; moisture content; mortality; remote sensing; California; Sierra Nevada [California]; United States; Coniferophyta
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124637
作者单位	Department of Earth System Science, University of California, Irvine, CA, United States; School of Engineering, University of California, Merced, CA, United States; Sierra Nevada Research Institute, University of California, Merced, CA, United States
推荐引用方式 GB/T 7714	Goulden M.L.,Bales R.C.. California forest die-off linked to multi-year deep soil drying in 2012–2015 drought[J],2019,12(8).
APA	Goulden M.L.,&Bales R.C..(2019).California forest die-off linked to multi-year deep soil drying in 2012–2015 drought.Nature Geoscience,12(8).
MLA	Goulden M.L.,et al."California forest die-off linked to multi-year deep soil drying in 2012–2015 drought".Nature Geoscience 12.8(2019).