而降水利用效率(RUE)是NPP与年降水量的比值,在评估NPP随降水的时空变化上是个有效、完整的指标(Le Houerou,1984;Le Houerou et al.,1988;Bai etal.
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充分提高农田降水利用效率是旱地农业中有限水高效利用的基础。
Fully raising rainfall use efficiency of farm-land is the basis of high efficient utilization to limited water in dry-land farming.
水分是限制旱地作物产量最主要的因素，提高自然降水利用效率是增加旱地作物产量的有效途径。
Water is the main factor influencing crop yield in dryland areas, and the efficient way to increase crop yield is to improve utilization efficiency of precipitation.
提高自然降水和灌溉水利用效率是节水农业要解决的中心问题。
The key problem needed to be solved in water saving agriculture is to increase the utilization efficiency of rainfall and irrigation.
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