Water use efficiency(WUE) is the ratio between the net amount of carbon absorbed by the plant(NPP) and the amount of water lost through evapotranspiration(ET).West China includes large arid and semi-arid regions and has suffered water shortage and ecosystem degradation in recent decades.Therefore,investigating the spatio-temporal characteristics of WUE for different vegetation ecosystems and identifying their distribution with low WUE and high WUE are important for the conservation and management of water a...
0引言水分利用效率(Water Use Efficiency,WUE)是指植被光合作用生产的干物质(或净初级生产力,NPP)与蒸散作用(ET)所消耗的水分之比[1],该指标反映了植被的光合生产过程与耗水特性之间的关系,可以采用单位面积上植物每蒸散1 mm水所能固定的有机碳克数来表示(gC·mm-1·m-2)[2].