Seasonal responses of terrestrial ecosystem water-use efficiency to climate change

doi:10.1111/gcb.13180

	Seasonal responses of terrestrial ecosystem water-use efficiency to climate change
	Poulter, B (Poulter, Ben)3,5; Shi, XY (Shi, Xiaoying)1,2; Yao, YT (Yao, Yitong)6; Yang, H (Yang, Hui)6; Wang, YP (Wang, Yingping)4; Piao, SL ; Huang, MT (Huang, Mengtian)6; Piao, SL (Piao, Shilong)6,7,8; Zeng, ZZ (Zeng, Zhenzhong)6; Peng, SS (Peng, Shushi)6
刊名	GLOBAL CHANGE BIOLOGY
	2016
卷号	22 期号:6 页码:2165-2177
关键词	Difference Vegetation Index Grassland Ecosystems European Forests Eddy Covariance Northern China Productivity Variability Exchange Trends
DOI	10.1111/gcb.13180
文献子类	Article
英文摘要	Ecosystem water-use efficiency (EWUE) is an indicator of carbon-water interactions and is defined as the ratio of carbon assimilation (GPP) to evapotranspiration (ET). Previous research suggests an increasing long-term trend in annual EWUE over many regions and is largely attributed to the physiological effects of rising CO2. The seasonal trends in EWUE, however, have not yet been analyzed. In this study, we investigate seasonal EWUE trends and responses to various drivers during 1982-2008. The seasonal cycle for two variants of EWUE, water-use efficiency (WUE, GPP/ET), and transpiration-based WUE (WUEt, the ratio of GPP and transpiration), is analyzed from 0.5 degrees gridded fields from four process-based models and satellite-based products, as well as a network of 63 local flux tower observations. WUE derived from flux tower observations shows moderate seasonal variation for most latitude bands, which is in agreement with satellite-based products. In contrast, the seasonal EWUE trends are not well captured by the same satellite-based products. Trend analysis, based on process-model factorial simulations separating effects of climate, CO2, and nitrogen deposition (NDEP), further suggests that the seasonal EWUE trends are mainly associated with seasonal trends of climate, whereas CO2 and NDEP do not show obvious seasonal difference in EWUE trends. About 66% grid cells show positive annual WUE trends, mainly over mid-and high northern latitudes. In these regions, spring climate change has amplified the effect of CO2 in increasing WUE by more than 0.005 gC m(-2) mm(-1) yr(-1) for 41% pixels. Multiple regression analysis further shows that the increase in springtime WUE in the northern hemisphere is the result of GPP increasing faster than ET because of the higher temperature sensitivity of GPP relative to ET. The partitioning of annual EWUE to seasonal components provides new insight into the relative sensitivities of GPP and ET to climate, CO2, and NDEP.
学科主题	普通生物学
语种	英语
WOS记录号	WOS:000378721700014
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7682]
专题	青藏高原研究所_图书馆
通讯作者	Piao, SL
作者单位	1.Oak Ridge Natl Lab, Climate Change Sci Inst, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA 2.Oak Ridge Natl Lab, Div Environm Sci, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA 3.Montana State Univ, Inst Ecosyst, Bozeman, MT 59717 USA 4.CSIRO Ocean & Atmosphere Flagship, PMB 1, Aspendale, Vic 3195, Australia 5.Montana State Univ, Dept Ecol, Bozeman, MT 59717 USA 6.Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing 100871, Peoples R China 7.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 8.CEA, CNRS, LSCE, UMR, Bat 709, F-91191 Gif Sur Yvette, France 9.CSIRO Land & Water Flagship, GPO Box 1666, Canberra, ACT 2601, Australia
推荐引用方式 GB/T 7714	Poulter, B ,Shi, XY ,Yao, YT ,et al. Seasonal responses of terrestrial ecosystem water-use efficiency to climate change[J]. GLOBAL CHANGE BIOLOGY,2016,22(6):2165-2177.
APA	Poulter, B .,Shi, XY .,Yao, YT .,Yang, H .,Wang, YP .,...&Mao, JF .(2016).Seasonal responses of terrestrial ecosystem water-use efficiency to climate change.GLOBAL CHANGE BIOLOGY,22(6),2165-2177.
MLA	Poulter, B ,et al."Seasonal responses of terrestrial ecosystem water-use efficiency to climate change".GLOBAL CHANGE BIOLOGY 22.6(2016):2165-2177.