Divergent spatial responses of plant and ecosystem water-use efficiency to climate and vegetation gradients in the Chinese Loess Plateau

doi:10.1016/j.gloplacha.2019.102995

	Divergent spatial responses of plant and ecosystem water-use efficiency to climate and vegetation gradients in the Chinese Loess Plateau
	Zheng, Han 1,6; Lin, Henry 5; Zhu, Xian-Jin 3; Jin, Zhao 2; Bao, Han 4
刊名	GLOBAL AND PLANETARY CHANGE
	2019-10-01
卷号	181 页码:11
关键词	Chinese Loess Plateau Climate gradient Plant water-use efficiency Precipitation sensitivity Vegetation gradient Water-use efficiency
ISSN号	0921-8181
DOI	10.1016/j.gloplacha.2019.102995
通讯作者	Zheng, Han(zhenghan@chd.edu.cn) ; Lin, Henry(henrylin@psu.edu)
英文摘要	Water-use efficiency (WUE) is an important indicator of carbon-water interactions and is defined as the ratio of vegetation productivity to water loss. However, how WUE varies along climate and vegetation gradients at the regional scale remains elusive. In this study, we investigated the spatial patterns of plant-canopy WUE (PWUE, i.e., ratio of gross primary productivity to plant transpiration) and ecosystem WUE (EWUE, i.e., ratio of gross primary productivity to evapotranspiration) in the Chinese Loess Plateau (CLP), which has seen large changes in the biosphere-atmosphere carbon and water cycles due to large-scale revegetation with the CLP. Spatial responses of PWUE and EWUE variations to the mean annual precipitation (MAP), mean annual air temperature (MAT), and normalized difference vegetation index (NDVI) gradients were examined based on remote-sensing and geostatistical model-based datasets. Results showed that mean EWUE estimated from two approaches was 1.26 +/- 0.28 and 1.37 +/- 0.68 g C kg(-1) H2O, respectively, lower than the mean PWUE (3.16 +/- 0.71 g C kg(-1) H2O) across the CLP. EWUE and PWUE estimates showed similar spatial distributions, generally with higher values in the areas with more water available. Precipitation sensitivities of EWUE and PWUE appeared to be positive except the very cold regions, and gradually decreased with increasing MAT in the forest-steppe and forest zones. Spatial variation in EWUE is intrinsically affected by both of PWUE and ecosystem water allocation (i.e., ratio of transpiration to evapotranspiration), and NDVI sensitivity of EWUE is dominant by ecosystem water allocation, leading to postive sensitivity of EWUE to NDVI for most MAP range in the CLP. PWUE variation depends on the geographic patterns of vegetation communities determined by precipitation pattern, leading to relatively lower and stable NDVI sensitivity than EWUE along the MAP gradient in the CLP. Our study revealed the divergent spatial responses of WUE to climate and vegetation gradients at the plant-canopy and ecosystem levels, which could enhance our understanding on the regional-scale carbon-water relationships across multiple organismic levels, and provide essential information for the WUE upscaling and modeling efforts.
资助项目	National Natural Science Foundation of China[31700414] ; National Natural Science Foundation of China[31500390] ; National Natural Science Foundation of China[41790444] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19020302] ; National Key Research and Development Program of China[2016YFA0600104] ; National Key Research and Development Program of China[2016YFA0600103]
WOS关键词	TERRESTRIAL ECOSYSTEMS ; CARBON-DIOXIDE ; LAND-USE ; EVAPOTRANSPIRATION ; WHEAT ; AFFORESTATION ; REVEGETATION ; IMPROVEMENTS ; VARIABILITY ; RADIATION
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000488666200010
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/13315]
专题	地球环境研究所_生态环境研究室
通讯作者	Zheng, Han; Lin, Henry
作者单位	1.Shandong Univ Sci & Technol, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Shandong, Peoples R China 2.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China 3.Shenyang Agr Univ, Coll Agron, Shenyang 110161, Liaoning, Peoples R China 4.Changan Univ, Sch Highway, Xian 710064, Shaanxi, Peoples R China 5.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA 6.Changan Univ, Key Lab Subsurface Hydrol & Ecol Effect Arid Reg, Minist Educ, Sch Environm Sci & Engn, Xian 710054, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Han,Lin, Henry,Zhu, Xian-Jin,et al. Divergent spatial responses of plant and ecosystem water-use efficiency to climate and vegetation gradients in the Chinese Loess Plateau[J]. GLOBAL AND PLANETARY CHANGE,2019,181:11.
APA	Zheng, Han,Lin, Henry,Zhu, Xian-Jin,Jin, Zhao,&Bao, Han.(2019).Divergent spatial responses of plant and ecosystem water-use efficiency to climate and vegetation gradients in the Chinese Loess Plateau.GLOBAL AND PLANETARY CHANGE,181,11.
MLA	Zheng, Han,et al."Divergent spatial responses of plant and ecosystem water-use efficiency to climate and vegetation gradients in the Chinese Loess Plateau".GLOBAL AND PLANETARY CHANGE 181(2019):11.