西安南郊曲江丰水年苹果林地土壤干层恢复

Reconstruction of dried layer under apple tree plantation at Qujiang in Southern of Xi′an City with plentiful raining year

通过对西安南郊曲江丰水年秋季15龄苹果林地土壤含水量的测定,以及与正常年份该地土壤含水量的对比,研究了该区苹果林地0～6 m之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,正常年份西安南郊曲江苹果林地2～4 m土层含水量介于8%和10%之间,表明该地有弱的干层发育;丰水年苹果林地2～4 m的土壤含水量在23%以上,远远高于正常年份同一层位的土壤含水量,这说明该地区的土壤干层已经消失.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,而且恢复的深度可达5 m,其恢复的速度也很快.

Through comparing the soil moisture content under 15-year-old apple tree plantation at Qujiang of Xi＇an City between autumn of plentiful raining year and the normal year, the change of the moisture content of 0-6 m deep under the ground and reconstruction of dried layer are studied. It is shown that dried layer of soil has developed in this area. The result shows that the moisture content of 2-4 m under the ground is more than 23 %, far higher than that of the normal annual. So dried layer of soil in Xi＇an will be reconstructed in plentiful raining year and reconstruction depth can be 5 m.