【摘要】 对黄土高原丘陵沟壑区不同植被地连续10a的试验调查发现,人工草地和沙棘、油松林地土壤水分在长系列年内变化上基本一致,1m土层含水量处于100～140mm,生长期土壤水分基本上处于亏缺状态;而荒坡草地土壤含水量年内均比人工草地高约40mm,土壤水分一直处于适宜、稳定的水平。林地沙棘和油松均表现出适应该地气候特点的生长的状况,但从土壤水文循环状况看,土壤水分长时期处于亏缺状态不利于植被的再生长和生态效益的发挥。径流试验研究表明,人工草地、油松林地年内平均径流深分别为1.45mm和1.27mm,径流系数为0.08和0.07;荒坡草地和沙棘林地在年内基本上不发生大的径流,且多为清流。因此,植被恢复在治理措施上应当注重植被的自然修复和保护,并充分利用径流资源补充土壤水分,使其朝着利于植被生长的方向发展。更多还原

【Abstract】 The continuous investigation and experiment on different vegetation in the loess hilly and gully region in past 10 years were conducted. The results indicate that soil moisture content varieties among the artificial grass, the seabuckthorn and the Chinese pine woodland are basic consistence in the long series years, the water resources were 100-140 mm in 1 m soil layer, and the soil was in "dry horizon" stage during growth period. Soil water content in natural grass land was about 40mm higher than artificial grass land in a year, the soil humidity was always in proper and stable level. The woodlands, seabnckthorn and Chinese pine, express the growth condition that are adapte to the weather character. But from the point of hydrological circulation condition, the long time "dry horizon" stage of soil humidity was disadvantage for vegetation growth and ecosystem development. The runoff experiments indicate that the average runoff of artificial grass land and Chinese pine woodland was 1. 45 mm and 1. 27 mm, the runoff coefficient was 0. 08 and 0. 07; The natural pasture and the seabuckthorn woodland did not produce big runoff during a year. The runoff was also small, and lots of them were clear fluid. Therefore, the managing measures of vegetation instauration should appropriate to its natural restoration and protection, and make greatly use of the runoff resources to add soil humidity, and to develope toward the benefical vegetation growth direction.更多还原