干旱区生态环境知识资源中心(Arid): Revegetation has increased ecosystem water-use efficiency during 2000-2014 in the Chinese Loess Plateau: Evidence from satellite data

Arid

DOI	10.1016/j.ecolind.2019.02.049
	Revegetation has increased ecosystem water-use efficiency during 2000-2014 in the Chinese Loess Plateau: Evidence from satellite data
	Zheng, Han 1,2; Lin, Henry 2,3; Zhou, Weijian 2; Bao, Han 4; Zhu, Xianjin 5; Jin, Zhao 2; Song, Yi 2; Wang, Yunqiang 2; Liu, Wenzhao 6; Tang, Yakun 6
通讯作者	Lin, Henry ; Jin, Zhao
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2019
卷号	102 页码:507-518
英文摘要	Vegetation coverage has been effectively increased across the Chinese Loess Plateau (CLP) mainly because of the implementation of large-scale revegetation programs. Understanding the entire CLP's ecosystem carbon-water relationship and its response to the vegetation coverage increase and climate change is essential for the water resources management in this semi-humid to arid region. Water-use efficiency (WUE), defined as the ratio of gross primary productivity (GPP) over evapotranspiration (ET), is an important indicator linking carbon and water cycles at the ecosystem scale. In this study, the spatial and temporal variations in the ecosystem WUE were analyzed to investigate the responses of WUE variation to regional climate and vegetation coverage changes in the CLP using MODerate Resolution Imaging Spectroradiometer (MODIS) datasets of GPP and ET from 2000 to 2014. Results indicate that the spatial pattern of annual WUE was different from that of WUE over active growing season (AGS), generally with higher annual WUE but lower AGS-WUE for the semi-humid southeastern CLP areas. Significant increases were observed in annual and autumn WUE during the study period at both the per-pixel and spatial-average levels, while AGS-WUE, spring WUE, and summer WUE remained quite stable. Correlations between WUE trends and interannual variability of vegetation coverage (expressed as Normalized Difference Vegetation Index or NDVI), precipitation (P), and air temperature (T-a) showed that WUE trends were positively correlated with NDVI variation due to faster increases in GPP as compared to ET caused by enhanced NDVI. Precipitation variation was generally negatively correlated to WUE variation by contributing to faster increases in ET than GPP especially at different seasons. The positive correlations between interannual variability of WUE and T-a were subject to negative feedbacks between ET and T-a. Similar results were also found using net primary productivity (NPP) to calculate ecosystem annual WUE (i.e., NPP/ET). Our findings suggest that revegetation-induced vegetation coverage change rather than P and T-a changes is the primary cause for the increasing ecosystem annual WUE in the CLP. This study contributes to our enhanced understanding of the coupled carbon-water dynamics over regional terrestrial ecosystem under climate and vegetation coverage changes.
英文关键词	Water-use efficiency Vegetation coverage change Evapotranspiration Gross primary productivity MODIS satellite dataset Chinese Loess Plateau
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000470964500050
WOS关键词	NET PRIMARY PRODUCTION ; TERRESTRIAL ECOSYSTEMS ; CARBON-DIOXIDE ; CLIMATE-CHANGE ; GREEN PROGRAM ; LAND-USE ; MODIS ; VEGETATION ; EVAPOTRANSPIRATION ; GRAIN
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	西北农林科技大学 ; 中国科学院地球环境研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215209
作者单位	1.Changan Univ, Key Lab Subsurface Hydrol & Ecol Effect Arid Reg, Sch Environm Sci & Engn, Minist Educ, Xian 710054, Shaanxi, Peoples R China; 2.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, CAS Ctr Excellence Quaternary Sci & Global Change, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China; 3.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA; 4.Changan Univ, Sch Highway, Xian 710064, Shaanxi, Peoples R China; 5.Shenyang Agr Univ, Coll Agron, Shenyang 110161, Liaoning, Peoples R China; 6.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Han,Lin, Henry,Zhou, Weijian,et al. Revegetation has increased ecosystem water-use efficiency during 2000-2014 in the Chinese Loess Plateau: Evidence from satellite data[J]. 西北农林科技大学, 中国科学院地球环境研究所,2019,102:507-518.
APA	Zheng, Han.,Lin, Henry.,Zhou, Weijian.,Bao, Han.,Zhu, Xianjin.,...&Tang, Yakun.(2019).Revegetation has increased ecosystem water-use efficiency during 2000-2014 in the Chinese Loess Plateau: Evidence from satellite data.ECOLOGICAL INDICATORS,102,507-518.
MLA	Zheng, Han,et al."Revegetation has increased ecosystem water-use efficiency during 2000-2014 in the Chinese Loess Plateau: Evidence from satellite data".ECOLOGICAL INDICATORS 102(2019):507-518.