Impoverishment of Soil Nutrients in Gully Erosion Areas in Yuanmou Basin

查看全文 作　　者：Zhang Jian-guo, Li Hui-xia, He Xiao-rong, Sheng Xin-ju, Fan Jian-rong, Zhu BoInstitute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China 出　　处：《Wuhan University Journal of Natural Sciences》索引2003年第8卷第03B期,共7页 基　　金：Supported by the Knowledge Innovation Program of Chinese Academy of Sciences(KZCX2-SW-319);National Key Technologies Research and Development Program in the 10th Five Year Plan of China(2001BA606A-07). 摘　　要：The impoverishment of soil nutrients of nine gully head areas in Yuanmou Basin is assessed through an integrated evaluation method established on the basis of Fuzzy mathematics and multivariate mathematical theory. Results show that soil erosion of gully erosion area in Yuanmou basin has resulted in severe impoverishment of soil nutrients. All gully head areas are at high leves of impoverishment except for one at middle. By probing into and analyzing the mechanism of impoverishment of soil nutrients, we find that soil erosion has led to impoverishment of soil nutrients in a way of compacting soil, heightening position of obstacle horizon, and reducing the content of organic matter, as well as the direct loss of nutrient elements. Finally, this paper points out that soil and water conservation arming at the prevention of soil erosion is the most effective way against impoverishment of soil nutrients in Yuanmou basin. 关 键 词：元某盆地 土壤侵蚀 土壤养分 模糊数学