Spatial-temporal patterns of water use efficiency and climate controls   in China&apos;s Loess Plateau during 2000-2010

doi:10.1016/j.scitotenv.2016.04.126

CORC > 北京大学 > 城市与环境学院

	Spatial-temporal patterns of water use efficiency and climate controls in China's Loess Plateau during 2000-2010
	Zhang, Tian ; Peng, Jian ; Liang, Wei ; Yang, Yuting ; Liu, Yanxu
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2016
关键词	Water use efficiency Net primary productivity Evapotranspiration Meteorological factors Loess Plateau, China NET PRIMARY PRODUCTIVITY ECOSYSTEM CARBON SEQUESTRATION DROUGHT SEVERITY INDEX LIGHT USE EFFICIENCY MAIZE ZEA-MAYS TERRESTRIAL EVAPOTRANSPIRATION WINTER-WHEAT NORTHERN SHAANXI ATMOSPHERIC CO2 MODIS DATA
DOI	10.1016/j.scitotenv.2016.04.126
英文摘要	Accurate assessments of spatial-temporal variations in water use efficiency (WUE) are important for evaluation of carbon and water balances. In this study, the spatial and temporal patterns of WUE and associated climate controls in China's Loess Plateau are investigated over 2000-2010 by utilizing remote sensing data and multiple statistical methods; which provides a greater understanding about how WUE changed after the Grain to Green Program (GTGP) launched. Carbon sequestration (i.e., net primary productivity, NPP) is estimated with the CASA model and water consumption (i.e., evapotranspiration, ET) is obtained from the MODIS product (i.e., MOD16). Our results identify an increasing trend in the regional mean NPP that amounted to 7.593 g C/m(2) center dot yr with an average value of 310.035 g C/m(2) center dot yr. Changes in ET are segmented into three stages, the growth (2000-2003), decline (2004-2006) and stable (2007-2010) stages. Regional WUE is measured at 0.915 g C/mm center dot m(2) and shows an upward trend at a rate of 0.027 g C/mm center dot m(2) center dot yr. Spatially, significant regional heterogeneity is found in both NPP and WUE with gradients decreasing from the southeast to the northwest, but sharp rises detected in northern Shaanxi. At the biome level, the annual average WUE of the four groups decrease in the order of grasslands > woodlands > shrublands > croplands. Moreover, all biomes in the grassland ecosystems exhibit a growth in WUE as does the arid desert zone in the northwestern region, suggesting that vegetation in moderately water-deficient areas may have a higher tolerance to drought. Among different meteorological factors, precipitation and drought severity index (DSI) in the Loess Plateau show a latitudinal zonality and influences the WUE, which indicated that the moisture rather than temperature would be the major control factor of the regional WUE. Finally, significant variation in vegetation WUE sensitivity in response to meteorological factors is noted. Temperature is found to be the dominant driving factor of shrublands WUE, whereas precipitation primarily influenced the WUE of grasslands, croplands, and woodlands. (C) 2016 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China [41322004]; SCI(E); EI; PubMed; ARTICLE; zhangtiangis@163.com; jianpeng@urban.pku.edu.cn; liangwei@snnu.edu.cn; Yuting.yang@csiro.au; liuyanxu@pku.edu.cn; 105-122; 565
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/433803]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Zhang, Tian,Peng, Jian,Liang, Wei,et al. Spatial-temporal patterns of water use efficiency and climate controls in China's Loess Plateau during 2000-2010[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016.
APA	Zhang, Tian,Peng, Jian,Liang, Wei,Yang, Yuting,&Liu, Yanxu.(2016).Spatial-temporal patterns of water use efficiency and climate controls in China's Loess Plateau during 2000-2010.SCIENCE OF THE TOTAL ENVIRONMENT.
MLA	Zhang, Tian,et al."Spatial-temporal patterns of water use efficiency and climate controls in China's Loess Plateau during 2000-2010".SCIENCE OF THE TOTAL ENVIRONMENT (2016).