摘要
林地被人为开垦破坏后 ,加速侵蚀是导致坡面土壤养分流失的根本原因。坡面土壤养分流失的空间分布与坡面侵蚀方式和侵蚀强度的空间分布相一致 ,浅沟沟槽是坡面土壤养分流失最严重的部位。土壤养分流失在开垦初期非常迅速 ,开垦耕种 5 a后 ,土壤养分含量可减少 5 0 %。土壤剖面中 A层的流失是土壤养分流失的标志。
Man made accelerated erosion is a key reason for soil nutrient loss after forestlands were disturbed by human being. Sloping spatial distribution of soil nutrient loss responds to spatial distribution of soil erosion patterns erosion intensity. Shallow gully ditch is the severest position of soil nutrient loss. Soil nutrients abruptly loss in the beginning stage of forest removal. After five years of forest removal, soil nutrient content reduces by 50%. A layer loss in soil profile is a sign of soil nutrient loss.
出处
《水土保持学报》
CSCD
北大核心
2002年第A01期44-46,共3页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目"黄土坡面土壤侵蚀与养分流失过程响应关系及其机理研究"(4 98710 5 0 )资助
关键词
人为加速侵蚀
土壤养分流失
子午岭次生林区
man made accelerated erosion
soil nutrient loss
Ziwuling second forest area
