土壤有效水分是土壤所含大于凋萎湿度的水分。它是土壤保水性好坏的一个实用指标。
随着土壤的通气性和渗透、排水率的改善，土壤有效水分增加。
With improvement of aeration, infiltration and drainage percent, the availability of moisture soil increases corresponsively.
结果表明，在年生长期中，刺槐林地水分条件严酷、土壤有效水分少。
The results show that the soil water conduction of the plantation was very poor and the available water content was very low during the growing season.
在土壤-植物-大气系统中，土壤有效水分贮存量、作物耗水量和有效降水量是农田水分平衡的主要组成因子。
In soil-plant-atmosphere system, soil available water content, crop water consumption, and effective precipitation are the main factors in water balance equation of farmland.
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