摘要
应用人工降雨试验及野外小区观测资料,分析了人为加速侵蚀对土壤退化的影响。结果表明:植被破坏后,由于土壤侵蚀加剧,使土壤表层每年流失0.8cm 左右;林草地在开垦的第一二年,土壤养分损失量较大;损失的养分大部分随土壤的流失而流失,使泥沙养分富集,泥沙中速效磷与土壤中速效磷富集化高达1.4～3.41;大量肥沃表土流失使土壤容重增大,土壤孔隙度下降,土壤平均入渗速度较林草地减少60%～70%;夏季土壤表层温度较林地升高10℃左右,使土壤水的损失加快,导致农作物旱情加重,环境质量变差。
Influnce of man-made accelerated erosion of forest vegetation destroyed by human on soil degradation has been analysed in this paper,using data of simulated rainfall experiment and observated data of the large slope runoff plots,The results shows that soil loss of surface layer is 0.8cm/a caused by severe soil erosion,organicmatter loss 3～5%/a.available phosphorus loss 10%/a,in the first reclaimed year,soil nutrition loss occupies 20% of total amount of soil nutri- tion,Because soil nutrition losses with soil loss,nutrition in sediment is rich,available phospho- rus contents is j.4～3.4 times than that in soil.Soil porosity decreases, soil infltration decreases 60～70%,compared with forest land,Soil tempereture on reclaimed Lands is 10℃ higher than that of forest lands in summer,which results in increasing soil water loss and strengthing drought situation of crops.All this result in soil degradation and eco-environment worsening.
出处
《水土保持研究》
CSCD
1993年第1期44-49,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金资助重大项目
关键词
人为加速侵蚀
土壤退化
养分富集
man-made accelerated erosion
soil degradation
nutrient richness
