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DOI	10.1016/j.agrformet.2020.107980
	Asymmetric impacts of dryness and wetness on tree growth and forest coverage
	Gao, Shan; Zhou, Tao; Yi, Chuixiang; Shi, Peijun; Fang, Wei; Liu, Ruishun; Liang, Eryuan; Julio Camarero, J.
通讯作者	Gao, S (通讯作者)
发表日期	2020
ISSN	0168-1923
EISSN	1873-2240
卷号	288
英文摘要	The prevalence of legacy effects, especially in drought-prone forests, makes the accurate assessment of forest dynamics under frequent climate fluctuations challenging. Here, we investigated the dynamic impacts of inter-annual water deficit on both tree radial growth and forest coverage in the southwest USA. We designed a series of regional-scaled natural experiments, specifically, we preset hypothetical water conditions of current- and antecedent-hydrological years and conducted quantitative analysis on grouped tree-ring records and sub-pixel changes of forest coverage under these conditions. Results showed that the temporal patterns of growth legacy changed dynamically when studying it on multiple events level (i.e., both past and current climate condition are taken into consideration): under current-hydrological year dry conditions, legacy effects over 3 years could be detected; while under current-hydrological year wet conditions, only previous 1 year's legacy could be detected, and its intensity was only 57% of that under current-hydrological year dry conditions. Furthermore, our results revealed that growth dynamics observed in tree rings were not fully consistent with the dynamic of forest coverage. Wetness enhanced growth pronouncedly, whereas normal to wet conditions only barely maintained the stability of forest coverage, suggesting that tree growth is more sensitive to wetness than forest coverage. In addition, the impact of consecutive dry years on tree radial growth showed no significant difference from that of a single dry year, but the decline of forest coverage accelerated after consecutive droughts. A possible explanation is that trees sampled from environmentally harsh locations though climate sensitive are not subjected to strong competitive constraints. These findings suggest that examining the responses at multiple scales in forests can help us gain more comprehensive understanding of processes involved in forest dynamics.
关键词	LONG-TERM CLIMATE MORTALITY DROUGHT PATTERNS TEMPERATURE VARIABILITY RESPONSES RINGS PLANT
英文关键词	Forest coverage; Legacy effects; Natural experiment; Temporal dynamics; Tree-ring; The southwest USA
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000538107200001
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
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/259949
推荐引用方式 GB/T 7714	Gao, Shan,Zhou, Tao,Yi, Chuixiang,et al. Asymmetric impacts of dryness and wetness on tree growth and forest coverage[J]. 中国科学院青藏高原研究所,2020,288.
APA	Gao, Shan.,Zhou, Tao.,Yi, Chuixiang.,Shi, Peijun.,Fang, Wei.,...&Julio Camarero, J..(2020).Asymmetric impacts of dryness and wetness on tree growth and forest coverage.AGRICULTURAL AND FOREST METEOROLOGY,288.
MLA	Gao, Shan,et al."Asymmetric impacts of dryness and wetness on tree growth and forest coverage".AGRICULTURAL AND FOREST METEOROLOGY 288(2020).