摘要
通过对陕西渭北旱原有代表性地区—富干旱原三年的土壤水分定位观测可以看出,该地区自然降水相对变率大,分散程度低,相对湿度不高/水分亏缺严重;土壤蓄水能力强。小麦播前二米土层贮水量三年平均521毫米,土壤水分变化有明显阶段性;从麦田土壤水分动态与小麦阶段耗水看,小麦有两个需水高峰期。亩产小麦165—325公斤,田间耗水量为394.6毫米,耗水系数1175公斤水/公斤麦。气候越干旱,耗水系数越高,水分生产效率越低。三年平均水分生产效率为0.58公斤麦/毫米。
The three years results of fixed observatons of soil moisture in wheat fields on the Rainfed Highland in Fuping County showed that the relative rate of natural rainfall varied greatly in its low dispersion rate and relative low humidity so that there is a serious lack of moisture in soil. Soil has a high capacity to store moisture So that the three years average moisture in 2-mewter-deep soil layer is 521mm before wheat sowing. The variations of soil moisture are eharacterized with stages. As viewed from soil moisture dynamics in wheat fields and water consumption in wehat growing stage、there are two high peaks of water consumption by wheat. The field water consumption for wheat yield of 165-325 kg per mu is 394.6 mm. The water consumption coefficient is 1175kg(water)kg-1(wheat). The drier the climate, the higher the water consumption coefficient and the lower the water production efficiency. The water production efficiency of three year average is 0.58 kg (wheat) per mu.
出处
《干旱地区农业研究》
CSCD
北大核心
1989年第2期52-60,共9页
Agricultural Research in the Arid Areas
