关中西部冬小麦蒸发蒸腾与棵间蒸发试验研究

Research on the Evapotranspiration and Soil Evaporation of Winter Wheat in Western Guanzhong

小麦生育期内土壤蒸发平均约占总蒸发蒸腾量的32%,播种返青期是小麦生长的初期阶段,以蒸发耗水为主,蒸发平均约占总蒸发蒸腾量的65%;返青收获期以蒸腾耗水为主,蒸发平均仅占20%,但蒸发耗水量却与前期相差不大。减少棵间蒸发(E)对冬小麦水分利用率的提高有很重要的作用。

The average evaporation accounts for about 32% of evapotranspiration in growing period of winter wheat,and green returing period is the preliminary stage of wheat growth,and its evaporation accounts for about 65% of evapotranspiration;in harvest time the transpirational water-consumption is the main moisture loss,and evaporation accounts for only 20% averagely,but the amount of evaporation of water is as the same as the previous period.So it is very important to reduce evaporation in order to increase water use efficiency of winter wheat.