干旱区生态环境知识资源中心(Arid): Unraveling the relative impacts of climate change and human activities on grassland productivity in Central Asia over last three decades

Arid

DOI	10.1016/j.scitotenv.2020.140649
	Unraveling the relative impacts of climate change and human activities on grassland productivity in Central Asia over last three decades
	Chen, Tao; Tang, Guoping; Yuan, Ye; Guo, Hao; Xu, Zhenwu; Jiang, Guo; Chen, Xiaohua
通讯作者	Tang, GP
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	743
英文摘要	Climate change (CC) and human activities (HA) have severely influenced grassland productivity in Central Asia since the 1980s. However, the relative impacts of CC and HA on grassland productivity are not adequately documented, especially over the past three decades. In this study, we adapted the Ensemble Empirical Mode Decomposition (EEMD) to reveal potential timescales at which grassland productivity varied in Central Asia and to investigate the spatiotemporal variations of grassland productivity during 1982-2015. We developed a quantitative method that incorporated the EEMD, along with six scenarios, to disentangle the effects of CC and HA on grassland productivity in Central Asia. Results showed that grassland productivity in Central Asia trended upward significantly at a rate of 0.66 gC m(-2)yr(-1) and was dominated by a 3-year time scale oscillation. The impacts of CC and HA on grassland productivity varied significantly over space and time. CC mainly facilitated grassland productivity restoration, whereas HA decreased grassland productivity in Central Asia. Besides, varied HA in six regions of Central Asia were due to different policy implementations across these regions. In particular, HA in Xinjiang significantly promoted grassland restoration, accounting for 22.5% of the total human-affected area, mostly because of the implementation of the Grazing Withdrawal Program (GWP), while HA significantly accelerated grassland productivity degradation in Uzbekistan and Turkmenistan over last three decades. Additionally, HA promoted the restoration of grassland productivity in Kazakhstan in a short period due to the disintegration of the Soviet Union, but degraded it at long-term scale. Further, precipitation was found to be the main climatic factor while grazing be the main human factor for controlling grassland productivity variations in Central Asia, respectively. Overall, our study provides not only a novel way of quantifying the impacts of CC and HA on vegetation variations but also new insights into mechanisms mediating grassland productivity in Central Asia. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Grassland productivity EEMD Multiple timescale analysis Climate change Human activities Central Asia
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000573539300019
WOS关键词	NET PRIMARY PRODUCTION ; EMPIRICAL MODE DECOMPOSITION ; VEGETATION DYNAMICS ; HUMAN APPROPRIATION ; ANTHROPOGENIC ACTIVITIES ; QUANTITATIVE ASSESSMENT ; ALPINE GRASSLAND ; LAND DEGRADATION ; CHINA ; DESERTIFICATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326547
作者单位	[Chen, Tao; Tang, Guoping; Xu, Zhenwu; Chen, Xiaohua] Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Peoples R China; [Yuan, Ye; Jiang, Guo] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; [Yuan, Ye] Key Lab GIS & RS Applicat Xinjiang Uygur Autonomo, Urumqi 830011, Peoples R China; [Yuan, Ye; Jiang, Guo] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Guo, Hao] Qufu Normal Univ, Sch Geog & Tourism, Rizhao 276825, Peoples R China; [Guo, Hao] Qufu Normal Univ, Rizhao Key Lab Terr Spatial Planning & Ecol Const, Rizhao 276825, Peoples R China
推荐引用方式 GB/T 7714	Chen, Tao,Tang, Guoping,Yuan, Ye,et al. Unraveling the relative impacts of climate change and human activities on grassland productivity in Central Asia over last three decades[J]. 中国科学院新疆生态与地理研究所,2020,743.
APA	Chen, Tao.,Tang, Guoping.,Yuan, Ye.,Guo, Hao.,Xu, Zhenwu.,...&Chen, Xiaohua.(2020).Unraveling the relative impacts of climate change and human activities on grassland productivity in Central Asia over last three decades.SCIENCE OF THE TOTAL ENVIRONMENT,743.
MLA	Chen, Tao,et al."Unraveling the relative impacts of climate change and human activities on grassland productivity in Central Asia over last three decades".SCIENCE OF THE TOTAL ENVIRONMENT 743(2020).