干旱地区农业研究2012，Vol.30Issue(4)：9-13,5.
黄土丘陵区多次降雨补充下草灌地土壤水分空间变化规律
Spatial variation of soil moisture on the grass and shrub land under multiple rainfall's supplement in Loess hilly area
摘要
Abstract
Based on the observation data of soil moisture under 42 simulated rainfalls in Yangou watershed of the Loess hilly area, responses of soil moisture to the simulated rainfalls an grass land and shrub land under two slopes with different management methods (undisturbed, cutting, plowing) were studied. The results were as follows: Under five supplementary rainfalls, according to the standard deviation and variation coefficient of soil moisture, the effect of land management on soil moisture in the 0- 100 cm soil layers showed that: the soil moisture in undisturbed grassbush land could be divided into active layer, relatively steady layer and sub-active layer; the whole soil profile of cutting land was a relatively steady layer: plowed land was divided into active layer and relatively steady layer. Under a single rainfall, the active and relatively steady layers would become thinner gradually or disappear with the increase of precipitation, while the sub-active layer increased, changes of the moisture content in the whole soil profile tended to be uniform. It was suggested that more sensitive discrimination sandards which were standard deviation and variation coefficient should be used to divide the soil layer according to moisture variability under high intensity supplementary rainfall: active layer, standard deviation > 1.4% , variation coefficient > 12%; sub-active layer, 1.4% > standard deviation > 0.9% , 12% > variation coefficient > 8% ; relatively steady layer, standard deviation < 0.9% , variation coefficient < 8%. Soil moisture increased with the decreasing of slope- Slope had a more siganificant effect on soil moisture in undisturbed land and cutting land compared to plowed land, and the effect of slope on soil moisture in 50 ~ 100 cm soil layer was more siganificant than that in 0 - 50 cm soil layer. In conclusion, soil moisture in depth of 0 - 100 cm gradually increased after a single rainfall, and soil moisture of the profile became gradually stable. Land management as well as slope had siganificant effects on both the change intensity of soil moisture and changes of that in different soil depth.关键词
黄土丘陵区/土壤水分/空间变化/草灌地Key words
Loess hilly area/soil moisture/spatial variation/grass land and shrub land分类
农业科技引用本文复制引用
赵鹏宇,徐学选..黄土丘陵区多次降雨补充下草灌地土壤水分空间变化规律[J].干旱地区农业研究,2012,30(4):9-13,5.基金项目
2012年忻州师范学院专题研究项目(ZT201214) （ZT201214）
中科院知识创新工程西部项目"黄土高原水土保持与可持续生态建设试验示范研究"(KZCX2-XB2-05) （KZCX2-XB2-05）
