中文摘要：

通过对不同降水年份西安南郊、北郊和东郊人工林地土壤含水量的测定，研究了地下0～600cm土壤含水量的变化与土壤干层水分恢复和消耗。结果表明：贫水年西安地区人工林地200～400cm土壤含水量小于10％，发育了弱的土壤干层；丰水年人工林地200—400cm土壤含水量大于20％，明显高于贫水年这一层位的含水量，指示土壤干层水分得到了恢复；平水年人工林地200—400cm土壤含水量小于15．5％，表明恢复的水分再次被消耗。分析得出，在降水丰富的年份，发育较弱的土壤干层不仅可以得到恢复，而深层恢复在时间上具有滞后性。同时，土壤水分含量对西安城市绿化树种的选取具有指导意义。

英文摘要：

Through determination of soil moisture under the plantations in the southern, northern and eastern suburbs of Xi＇an in different precipitation years, change of soil moisture of 0- 600cm soil layer, restoration and consumption of the dried layer were studied. The results showed that soil moisture of 200 - 400cm soil layer under plantation is less than 10% in dry year and dried layer has developed. However, in moist year soil moisture of 200 -400cm soil layer is more than 20%, and is higher than that of dry year, soil moisture of dried layer was restored. In normal year, the soil moisture of 200 -400cm soil layer is less than 15.5% , so the soil moisture was consumed again. The analysis obtained that in the enough wet year, the weak soil dried layer can be restored, but the restoration of deep layer is in later, Meanwhile, soil moisture is a guide of the urban plantation construction.