土壤水分供应充足的晴天，苹果幼树叶片水分亏缺影响净光合效率(PN)。
Leaf water deficits influents net photosynthesis efficiency (PN) of the apple leaves on a sunny day when there is enough water in soil.
蒸发蒸腾作用能消耗土壤水分，减少地下水的水量供应。
Evapotranspiration may deplete the soil moisture and rob supplies of ground water.
丘间低地土壤水分变化特征表现为：水分变化频繁活动层，水分潜在供应层，水分相对稳定层。
The changing features of the soil water in the lowland around by sand dune are: the frequent changing layer, the potential supplying layer and the relatively stable layer.
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