河北平原吨粮田土壤水分平衡研究

Soil Water Balance in Cropfield Yielding One Ton of Grain Yield Per Mu on Hebei Plain

利用１９８９～１９９１年水泥池定位观测实验，分析了河北半湿润易旱区小麦—夏玉米为轮作方式的一年两作条件下０～１５０ｃｍ土层的土壤水分平衡，并根据其失水数量确定了土壤水的补充量。作物产量与耗水量的关系表明：两茬作物亩产量要达到吨粮田标准，最经济的耗水量为６４２．９～７５４．６ｍｍ，年需水分数量为６４２．９～７５７．４ｍｍ。

This paper analyses soil water balance in 0～150 cm soil layer in thecase of wheat and summer一corn rotation pattern of two crops a year using the 1989～1991 fixed─position observation tests in the cement pool in the semi一humid regionliable to drought in Hebei Province。The amount of supplement water in soil is deter-mined in accordance with the amount of water loss。Also,the relation between cropyields and water consumption indicates that the optimal economic water consuption forobtaining the ton of grain yield per mu can be 642.9～754. 6mm, and that the yearly wa-ter requirement will be 642.9～757.4mm。