摘要
采用田间试验和观测方法研究了渭北旱原东部旱作区的农田土壤水分特征和水分生产效率,结果表明,该区在麦田夏闲蓄水期(7—9月)降水量在212.7毫米以下时,1—1.2米深处存在一相对干土层,使小麦生育后期对深层土壤水分利用产生一定影响。研究还看出,旱地农田水分生产效率具有明显地随播前土壤储水量增加而提高的趋势,说明渭北旱原东部的土壤水库在旱农条件下作物供水调节中的不可代替作用。
The field experinents and observations were made to study soil moisture behaviorsand its productive efficiency in farmlands showed that when rainfall was below 212.7mmin the water storage period of summer fallow (July to August )in this region, there ex-isted a dry soil layer in the depth of 1--1.2 meters, which has an important impact uponthe utilization of soil moistuer in deep layer by winter wheat in its late developing stage. Itcan also be seen from the studies that soil moisture productive efficiency has an apparenttendencyto raise sa soil moisture storage increases before sowing .This indicates that thesoil moisture reservoir has an important role in regulating water supplies to crop growthin the case of dryland farming.
出处
《干旱地区农业研究》
CSCD
北大核心
1990年第4期37-43,共7页
Agricultural Research in the Arid Areas
关键词
土壤水分
农田
旱地
水分生产效率
dry soil layer
storage reservoir period
water productive effiviency
