摘要
以子午岭土壤侵蚀与生态环境演变观测站长年观测的径流泥沙资料为基础 ,分析了林地及其开垦地不同侵蚀年限土壤的颗粒组成、>0 .2 5 mm水稳性团粒含量、抗剪强度和容重等土壤物理力学性质与土壤侵蚀强度的关系。研究结果表明 ,>0 .2 5 mm水稳性团粒含量对土壤侵蚀强度影响最大 ,其偏相关系数为 0 .972 8,其次为土壤的粗粉粒含量和抗剪强度。最后对 >0 .2 5 mm水稳性团粒含量和抗剪强度与土壤侵蚀强度的关系进行了分析 ,表明林地开垦后侵蚀第 1年和第 7年为土壤侵蚀强度加剧的转折点 ,说明了森林植被在防治黄土高原土壤侵蚀方面的作用。
Using the 10 years data about runoff and sediment in loess hilly forest region, the correlation between soil particle, water stable aggregate content, unit weight, sheer strength and the soil erosion intensity was analyzed, the result showed that >0.25 mm water stable aggregate was the maximum effect factor to soil erosion, then the coarse grain and sheer strength. At last, the relation between the >0.25 mm water stable aggregate content, soil sheer strength and the soil erosion modulus unit rainfall erosion force was analyzed, which showed that the first and seventh year were the turn year after the forestlands reclaimed, and reveled the important factor of vegetation to control the soil erosion in loess plateau.
出处
《水土保持学报》
CSCD
北大核心
2001年第3期20-23,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目资助 ( 19832 0 60 )
关键词
开垦林地
土壤物理力学性质
土壤侵蚀强度
时间变化
reclaimed forest lands
soil physical and force properties
soil erosion intensity
temporal change
