西安附近丰水年秋季苹果林地土壤水分恢复研究

Soil moisture condition and dry-layer development under Xi'an southern suburb apple orchard in rainy years

摘要: 通过对西安市附近曲江池村丰水年春季和秋季15龄苹果林地土壤含水量的测定，以及不同季度该地土壤含水量的对比，研究了苹果林地0～6m土层间土壤含水量的变化与土壤干层的恢复问题。研究结果显示，春季西安市南郊苹果林地2～4m土层含水量为8%～10%，表明该地有弱的干层发育；丰水年秋季西安南郊苹果林地2～4m土层含水量在23%以上，远高于春季该层位的土壤含水量，说明该地区的土壤干层己经消失。分析得出，在降水丰富的年份，发育较弱的土壤干层水分不仅可以得到恢复，且恢复的深度可达5m，恢复速度也很快。

Abstract: Through the determination and comparison of autumn and spring(for rainy years) soil moisture contents under 15-year old apple orchards in the southern suburb of Xi'an,a change in the moisture content within 0～6m depth of soil and the development of dry-layers were analyzed.It is shown that soil moisture within 2～4m soil depth is 8%～10% in spring indicating developed dry-layers of soil.Moisture content within 2～4m soil depth in autumn is more than 23%,far higher than that in spring showing that dry-layers have dispeared.Therefore soil moisture of dry-layer developed in the spring can be recovered rapidly to 5m deep in rainy years.