水土保持研究2012，Vol.19Issue(4)：16-20,29,6.
模拟降雨条件下地表糙度动态变化特征研究
Study on Dynamical Variation Characteeistics of Surface Roughness under Field Simulated Rainfall Condition
摘要
Abstract
Soil surface roughness is one of the main factors affecting soil erosion. To further determine effects of soil surface roughness on the erosion, dynamical variation characteristics of surface roughness, variation regularity and affecting factors were obtained under following conditions, i.e. rainfall sequence, slope, vegetation coverage and spatial slope section through field simulated rainfall experiment. Results showed that surface roughness was always affected by the above factors during rainfall period. Soil surface roughness in- creased with rainfall events. The richer the vegetation coverage was, the less the surface roughness was. The steeper the slope was, the more increase extent of surface roughness was, and the more obvious of increase tendency was in experimental range. The variation rules of each slope section were overall following the above patterns, but there was spatial variability in some slope sections. Due to the spatial variability, some slope sectionls function was water storage and sediment reduction as well as erosion reduction. On the con-trary, the effect on sediment and runoff was potential flushing and erosion aggravation in other slope section. The factors and interaction effect were the main affecting factors on variation of surface roughness. The results provide theoretic basis for revealing the erosion characteristics through soil surface roughness, and at the same time, it can serve for controlling soil and water loss on the Loess Plateau.关键词
地表糙度/降雨/侵蚀/动态变化Key words
surface roughness/rainfall/erosion/dynamical variation分类
农业科技引用本文复制引用
张霞,贾莲莲,李占斌,于国强,武金慧..模拟降雨条件下地表糙度动态变化特征研究[J].水土保持研究,2012,19(4):16-20,29,6.基金项目
中国博士后基金 （）
陕西省自然科学基础研究计划项目 （）
国家自然科学基金项目 （）
国土资源部科研专项 （）
