The result showed that the availablesoilwater quantity varied and was affected by precipitation apparently during a year.
结果表明，①土壤有效水量年内变化明显，受降水影响显著；
2
At last, a drought index model was developed by considering the water requirement of winter wheat and the availablesoilwater content.
最后，根据冬小麦的需水规律和土壤有效水含量构造干旱指数模型。
3
Some areas, because of their soil texture, topographical position, or distance from rivers or groundwater, have virtually no wateravailable to plants, whereas others do.