论文部分内容阅读
用张力计对甘肃４个不同地点的黑垆土持水特征的研究结果表明，黑垆土低吸力段水分特征曲线可用指数式、幂函数以及双曲线表达，相关系数均达极显著水平。土壤质地与结构显著地影响水分特征曲线，但结构的影响主要在３０～４０ｋＰａ之前。供试的几种黑垆土当吸力为８０ｋＰａ时，其比水容量基本都达到１０￣（－２），８０ｋＰａ以下的有效水均为易效水。土壤有效水量为８８～１７０ｇ／ｋｇ，易效水量为３５～６３ｇ／ｋｇ，易效水占全部有效水的２５．０％～５３．９％。
The results of the tensiometer on the water holding characteristics of the black soil in four different places in Gansu Province showed that the water content curve of the black soil can be expressed exponentially, power function and hyperbola with the correlation coefficient reaching the significant level. Soil texture and structure significantly affected the water characteristic curve, but the major effect of the structure was at 30-40 kPa. When the suction pressure is 80kPa, the specific water capacity of several black mulched soils reaches 10 ~ (-2), and the effective water below 80kPa is easy to be effective. Soil effective water is 88-170g / kg, easy-to-effect water is 35-63g / kg, easy-to-effect water accounts for 25.0% ~ 53.9% of the total effective water.