摘要
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 moisture characteristics of Heilu Soils sampled from four different locations of Gan-su province was studied with suction meter.It was showed that soil moisture curve in low suction phase can be expressed by power founction,exponential founction,and reciprocal founction,and the correlation coefficients of them all reach significant level.Soil texture and structure condition significantly influence moisture curve,however,the influence of structure mainly takes place in the phase of suction below 30～40 kPa,When the suctions of Heilu soil become 80 kPa,soil specific water capacities all reach at 10￣(-2) level,so the available water be-low 80 kPa of studied soils is quickly available water.The available water contents range from 88～170g/kg, of which the quickly available water contents account for 25%～53.9% per cent and vary from 35～63 g/kg.
出处
《西北农业学报》
CSCD
1994年第3期23-26,共4页
Acta Agriculturae Boreali-occidentalis Sinica
关键词
甘肃
黑垆土
持水特征
Heilu Soil
Molsture character curve
Specific water capacity
Available water
