气候变化领域集成服务门户(CCPortal): Elevation-dependent response of vegetation dynamics to climate change in a cold mountainous region

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DOI	10.1088/1748-9326/ab9466
	Elevation-dependent response of vegetation dynamics to climate change in a cold mountainous region
	Xu S.; Yu Z.; Lettenmaier D.P.; McVicar T.R.; Ji X.
发表日期	2020
ISSN	17489318
卷号	15 期号:9
英文摘要	Mountain regions are experiencing more pronounced climate change than other global land areas. How have vegetation dynamics responded to these changes and what are the implications for hydrology? To answer these questions, we examine the impacts of changes in mean air temperature (Tmean ), precipitation (P) and winter snow cover extent (SCE) in the headwaters of the Yellow River basin (HYRB) on two important vegetation dynamic metrics: (i) the maximum growing-season greenness (represented by the monthly maximum NDVI); and (ii) the beginning of growing season (BGS). Satellite-derived NDVI and SCE, along with observation-based gridded climate data, show that during the past 34 years (1982-2015) the HYRB experienced widespread vegetation greening, while no significant trend in BGS was observed. Spring greenness and phenology were significantly affected by SCE change, highlighting the importance of snow-related process to spring vegetation activity. We observed a clear signal of elevation-dependent warming below 4300 m elevation, which is absent at higher elevations. Changes in NDVI and BGS are elevation-dependent, and trends in Tmean, P, and SCE with elevation play different roles in this dependence. Both observed and estimated watershed annual evapotranspiration series show increasing trends, suggesting that vegetation greening imposes positive effects on evaporative fluxes. Given steady-state and non-stationary hydrological conditions, increasing evapotranspiration should result in runoff reduction, which agrees with catchment-scale runoff observations across the HYRB. These findings represent new knowledge regarding the vegetation response to climate change in alpine environments which has important implications for the hydrology of the region and for other high-water yielding mountainous regions worldwide. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	elevation-dependent warming; evapotranspiration; mountainous region; NDVI; runoff; vegetation phenology
语种	英语
scopus关键词	Catchments; Evapotranspiration; Runoff; Snow; Vegetation; Annual evapotranspirations; Hydrological condition; Mean air temperatures; Mountainous regions; Vegetation activity; Vegetation dynamics; Vegetation greening; Vegetation response; Climate change; climate effect; cold region; elevation; mountain region; temperature effect; topographic effect; vegetation dynamics; vegetation type
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153745
作者单位	State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, China; College of Hydrology and Water Resources, Hohai University, China; Department of Geography, University of California, Los Angeles, United States; CSIRO Land and Water, Canberra, Australia; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, China
推荐引用方式 GB/T 7714	Xu S.,Yu Z.,Lettenmaier D.P.,et al. Elevation-dependent response of vegetation dynamics to climate change in a cold mountainous region[J],2020,15(9).
APA	Xu S.,Yu Z.,Lettenmaier D.P.,McVicar T.R.,&Ji X..(2020).Elevation-dependent response of vegetation dynamics to climate change in a cold mountainous region.Environmental Research Letters,15(9).
MLA	Xu S.,et al."Elevation-dependent response of vegetation dynamics to climate change in a cold mountainous region".Environmental Research Letters 15.9(2020).