西安地区丰水年有林地土壤水分恢复效应研究

Restoration effect of soil moisture content under woodlands in Xi'an region in wet year

通过对西安南郊平水年与丰水年秋季有林地土壤含水量的测定,研究了地下0-6 m之间土壤含水量的变化与土壤水分恢复问题。研究结果表明,正常年西安地区人工林2-4 m土壤含水量为9%-10%,发育了明显的土壤干层,表明土壤干层在黄土高原分布具有普遍性;丰水年西安南郊人工林下2-4 m的土壤含水量在18%-24%之间,高出正常年份这一层位含水量的8%-14%,土壤干层已经消失;丰水年4-6 m的土壤含水量也明显升高。分析得出,在降水丰富的年份,土壤水分得到恢复,而且恢复的深度可达5 m,恢复的速度也较快。

Through determination of soil moisture under artificial forest in the southern suburb of Xi an in normal year and wet year,change and restoration of soil moisture underground from 0～6 m are studied.The results show that soil moisture content underground between 2～4 m under artificial forest is from 9% to 10% in Xi an region in normal year and soil moisture is low.However,in wet year soil moisture underground between 2～4 m is from 18% to 24%,and is 8% higher than that of normal year.The soil moisture content underground from 4 - 6 m goes up obviously in wet year. From analysis it is also found that, in wet year, the soil moisture can not only be restored but also the restoration depth can reach 5 m and the speed is also very quick.