The condition of distribution and utilization of the trees is presented in this paper.
此外还介绍了这些树种的分布与利用情况。
The results show that the main causes of small-old trees are the soil water deficiency, the low water utilization rate and the low fertility in soil.
研究结果表明，形成小老树的主要原因是土壤水分亏缺、水分利用率低和土壤肥力不足。
Because the soil storage water could not adjust the water utilization of apple trees, the yield of orchard was affected by precipitation.
由于土壤深层水对干旱的调节作用减弱或丧失，导致苹果产量受控于当季节降水。
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