Analysis of the Spatio-Temporal Characteristics of Water Use Efficiency of Vegetation and Its Relationship with Climate in the Heihe River Basin

doi:10.7522/j.issn.1000-694X.2016.00065

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (4): 733-741.DOI: 10.7522/j.issn.1000-694X.2016.00065

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Analysis of the Spatio-Temporal Characteristics of Water Use Efficiency of Vegetation and Its Relationship with Climate in the Heihe River Basin

Li Xiaojuan, Zhang fuping, Wang Huwei, Lei Shengjian, Gao Zhang

College of Tourism and Environment/National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an 710119, China

Received:2016-03-05 Revised:2016-05-18 Online:2017-07-20 Published:2017-07-20

Abstract

Abstract: Accurate assessments of spatio-temporal variations in gross primary productivity (GPP),evapotranspiration (ET),and water use efficiency (WUE) play a crucial role in the evaluation of carbon and water balance as well as have considerable effects on climate change.Study found that the year mean value of GPP was 314.44 gC·m^-2,evapotranspiration was 363.35 mm,estimated on the basis of the average years of vegetation WUE 1.15 gC·mm^-1·m^-2,Heihe River Basin WUE showing increasing from south to north of the spatial distribution,the distribution of the year show a "single peak" type pattern;WUE high values distributed in Jiuquan-Linze stuff online and Ejin Andean desert riparian forest zone,while Tuole southeastern region was the WUE low area;Heihe River Basin ecosystem WUE has obviously seasonal variation,the performance of summer > spring > autumn > winter,features summer up 1.32 gC·mm^-1·m^-2;Increase water use efficiency and the distribution of annual trend rate has a certain relationship,Yingluoxia-folk music along the high water use efficiency bucket is also the entire basin area Fast trend rate of growth,in ecosystem WUE stability,River oasis area changes the most significant in the middle and lower reaches,upstream high-altitude and the middle and lower of the Gobi region does not change significantly;correlation between WUE and annual rainfall,the annual average temperature is main negative correlation,where rainfall is the major factor affecting vegetation WUE.WUE positively correlated with the regional distribution of water in Shandan County,east of Minle County,Sunan southern lakes region,while the temperature was positively correlated only oasis in the downstream area.

Key words: water use efficiency (WUE), gross primary production (GPP), evaptranspiration (ET), Heihe River Basin

CLC Number:

Q948.15

Li Xiaojuan, Zhang fuping, Wang Huwei, Lei Shengjian, Gao Zhang. Analysis of the Spatio-Temporal Characteristics of Water Use Efficiency of Vegetation and Its Relationship with Climate in the Heihe River Basin[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(4): 733-741.

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Analysis of the Spatio-Temporal Characteristics of Water Use Efficiency of Vegetation and Its Relationship with Climate in the Heihe River Basin

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