摘要
土壤蒸发是研究土壤水分平衡中一个重要组成部份。经在陕西省渭北旱原永寿县用苏式гги—500—100型土壤蒸发器对小麦农田土壤蒸发进行实测,结果表明:永寿县1983—1987年冬小麦农田实际蒸散量平均为444.9毫米,日平均蒸散量为1.6毫米。偏涝年降水量大于农田蒸散量,偏旱年小于农田蒸散量。同时农田蒸散量与植株发育状况及环境条件等有密切关系。经用水分平衡公式计算,1984—1987年永寿县除个别年份和个别小麦发育期水分收入大于水分支出外,总的说,水分的收入还不足支出,干旱是造成当地小麦减产的主要原因之一。
Soil moisture evaporation is on important part for soil moisture balance.Measuments,of soil moisture evaporation on farmlands grawing winter Wheatusing ΓΓИ-500-100 soil evaporimeter in Yongshou County Weibei LoessPlatcau shows that the average evapotranspiration on the farmlands is 444.9mm from 1983 to 1987.The daily evapotrantpirasion is 1.6mm,the preciplationin more rain year is more than the average evapotranspiratson,the precipla-tion in drough year is less than the average evapotranspiration.In the mean-while,the evapotranspiration on farmlands is very closely related to growthstate of plants and enviroriment condition.The calculaton results using thewater balance formula show that the water take by plants on farmlands is lessthan the evaporation apart from a few years and specific growth stage ofwheat therefore.Drought is one of primary factore redacing.
出处
《干旱地区农业研究》
CSCD
北大核心
1990年第1期70-75,共6页
Agricultural Research in the Arid Areas
基金
旱地农田水分动态水分平衡及调控措施的研究课题
关键词
土壤
蒸发
水分平衡
evapotranspiration of farmlands
soil water balance
drought
