甘肃省东部旱作区的气候条件、降水补给作用及作物生长发育状况的特殊性,导致土壤水分具有独特的时空分布规律。麦田2m土层水分的周年变化呈一峰一谷型,可划分为旱季失墒消耗阶段和雨季蓄墒贮水阶段;其垂直变化呈"S"型,可划分为水分多变层、过渡层及稳定层。

The difference between the climate condition and the precipitation supply function with the crop growing state causes that the soil moisture have a special spatial and temporal distribution rule in the dry land in the East Gansu.The annual variation of moisture in 2m soil layer for the wheat field shows one peak and one valley pattern and is divided into the moisture consuming period in drougnt season and the moisture storing period in rain season.Its vertical change appears "S" pattern,and it is divided into the changeable layer,the transitional layer and the stable layer.