摘要
使用对比、回归分析和主成分分析的方法,研究影响农牧交错带退耕还草地土壤风蚀的因子。结果认为,试验地区土壤在3月～5月间潜在风蚀最强,相同气候条件下,退耕还草地比农田受风力侵蚀的几率低;被试范围内随土壤体积质量、植物基盖度、留茬高度、地表粗糙度和土壤非侵蚀性团聚体含量的增加,风蚀强度均呈下降趋势;构建的2个相互对立的土壤风蚀影响因子中,对土壤风蚀的影响最大的是留茬高度因子,其次为地表粗糙度因子。
The study, analyzing the effect factors of grassland that has been transformed from cropland in the agro-pastoral transi-tional zone by comparing, regression analyzing and main component analyzing, revealed that: (1) It has a strongest potential soil erosion from March to May in the experiment area; (2) Under the same weather conditions grassland transforming from cropland has lower chance to be erode by wind than cropland; (3) With the increasing of soil bulk density、plant coverage、stubble height、rough degree and >1mm nonerodible aggregates content, the soil erosion reduce (4) Among the affecting factors ,which is established in this study and is absolute independent, stubble height factor is the first and rough degree factor is the second.
出处
《生态环境》
CSCD
北大核心
2005年第3期382-386,共5页
Ecology and Environmnet
基金
国家重点基础研究发展规划项目(G2000018606)
关键词
农牧交错带
退耕还草
土壤风蚀
agro-pastoral transitional zone
transforming cropland into grassland
soil erosion
