摘要
苜蓿地土壤水动态受降雨和地下水埋深的影响。当地下水位埋深小于5m 时,地下水位埋深上升为影响土壤水动态的主要因素。研究表明,苜蓿耗水高峰值出现在6月中下旬至8月中下旬,日蒸散量最大可达23mm,苜蓿总耗水量760～810mm,最大水分利用效率为22.95kg/(mm·hm^2)。
Soil water moving patterns in alfalfa fields is effected by precipitation and underground wa- ter level.When the depth of underground water level is less than 5m,it becomes the major factor effecting soil water moving patterns.The study indicates that the peak water consumption of alfalfa appears in the period from the second or last ten days of June to that of Aug.,the maximum of daily evaporation can be 23mm and the amount of water consumption is(760～810)mm,the maximum of water utilization rate is 22.95kg/(mm·hm^2)
出处
《海河水利》
1997年第4期9-11,共3页
Haihe Water Resources
基金
国家自然科学基金资助
关键词
苜蓿
土壤水动态
耗水规律
苜蓿地
含水量
alfalfa
soil water moving patterns
water consumption regulation
