摘要
采用人工模拟降水和自然降雨在毛乌素沙地对结皮与水分运动关系的试验和观测,人为控制降雨强度、降雨时长等方法测定沙地土壤结皮对降水的拦截、入渗规律的影响。在自然环境下,研究结皮对土壤水分的蒸发、损耗试验,揭示沙地土壤结皮对水分蒸发及保水能力的影响规律。结果表明:结皮对降雨入渗有拦截作用,降雨强度越大,拦截作用越大,反之,拦截作用越小。结皮可保持土壤水分,在地下5～60 cm土层中,结皮在降雨结束24 h后保持湿度是裸沙区湿度的4.6倍。结皮对深度入渗有延长时效的作用,有效地延缓了水分快速渗漏速度。结皮有效阻止水分快速蒸发,结皮区水分蒸发至3%要比裸沙区延后5～6 d。
Effects soil crust on the water movement in Maowusu sand land were investigated under the artificial rain and natural raing. The results showed that soil crust could intercept the rainfall infiltration. The greater the rainfall intensity, the greater interception, and vice versa. Crust can retaini soil humidity~ under 5~60 cm soil depth, the moisture of soil with crust was 4.6 times more than that without crust after 24-hour of rainfall. Soil crust can prolong the water infiltrations time in depth seep, slowdown the speed of leakage. The crust can be also to hold back the water to be evaporated quickly, the time of evaporation to 3%, soil moisture in the soil with crust was 5-6 days delay longer than that without crust.
出处
《西北林学院学报》
CSCD
北大核心
2010年第1期7-10,共4页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(30670339)
关键词
土壤结皮
模拟降雨
入渗
蒸发
soil crust
simulated rainfall
infiltration
evaporation
