气候变化领域集成服务门户(CCPortal): Climate-induced tree-mortality pulses are obscured by broad-scale and long-term greening

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DOI	10.1038/s41559-024-02372-1
	Climate-induced tree-mortality pulses are obscured by broad-scale and long-term greening
	Yan, Yuchao; Piao, Shilong; Hammond, William M.; Chen, Anping; Hong, Songbai; Xu, Hao; Munson, Seth M.; Myneni, Ranga B.; Allen, Craig D.
发表日期	2024
ISSN	2397-334X
起始页码	8
结束页码	5
卷号	8 期号:5
英文摘要	Vegetation greening has been suggested to be a dominant trend over recent decades, but severe pulses of tree mortality in forests after droughts and heatwaves have also been extensively reported. These observations raise the question of to what extent the observed severe pulses of tree mortality induced by climate could affect overall vegetation greenness across spatial grains and temporal extents. To address this issue, here we analyse three satellite-based datasets of detrended growing-season normalized difference vegetation index (NDVIGS) with spatial resolutions ranging from 30 m to 8 km for 1,303 field-documented sites experiencing severe drought- or heat-induced tree-mortality events around the globe. We find that severe tree-mortality events have distinctive but localized imprints on vegetation greenness over annual timescales, which are obscured by broad-scale and long-term greening. Specifically, although anomalies in NDVIGS (Delta NDVI) are negative during tree-mortality years, this reduction diminishes at coarser spatial resolutions (that is, 250 m and 8 km). Notably, tree-mortality-induced reductions in NDVIGS (\|Delta NDVI\|) at 30-m resolution are negatively related to native plant species richness and forest height, whereas topographic heterogeneity is the major factor affecting Delta NDVI differences across various spatial grain sizes. Over time periods of a decade or longer, greening consistently dominates all spatial resolutions. The findings underscore the fundamental importance of spatio-temporal scales for cohesively understanding the effects of climate change on forest productivity and tree mortality under both gradual and abrupt changes. Using multiple remote-sensing datasets, the authors show that temporal and spatial scale influence the detection of tree-mortality events and explain why there has been a seemingly conflicting pattern of both overall greening but also extensive tree mortality in recent decades.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
WOS类目	Ecology ; Evolutionary Biology
WOS记录号	WOS:001185553400001
来源期刊	NATURE ECOLOGY & EVOLUTION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302893
作者单位	Peking University; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; State University System of Florida; University of Florida; Colorado State University; Colorado State University; United States Department of the Interior; United States Geological Survey; Boston University; University of New Mexico
推荐引用方式 GB/T 7714	Yan, Yuchao,Piao, Shilong,Hammond, William M.,et al. Climate-induced tree-mortality pulses are obscured by broad-scale and long-term greening[J]. 中国科学院青藏高原研究所,2024,8(5).
APA	Yan, Yuchao.,Piao, Shilong.,Hammond, William M..,Chen, Anping.,Hong, Songbai.,...&Allen, Craig D..(2024).Climate-induced tree-mortality pulses are obscured by broad-scale and long-term greening.NATURE ECOLOGY & EVOLUTION,8(5).
MLA	Yan, Yuchao,et al."Climate-induced tree-mortality pulses are obscured by broad-scale and long-term greening".NATURE ECOLOGY & EVOLUTION 8.5(2024).