Bai Hongying,Tang Keli,Zha Xuan,et al.Effect of Man-made Accelerated Erosion on Soil Degradation[J].Research of Soil and Water Conservation,1993,(01):44-49.
人为加速侵蚀对土壤退化的影响
- Title:
- Effect of Man-made Accelerated Erosion on Soil Degradation
- 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。
- Abstract:
- 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.
参考文献/References:
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[2] 中国科学院黄土高原综合科学考察队.黄上高原地区土壤侵蚀区域特征及其治理途径.中国科学技术出版社, 1990
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[4] 鲁坤强.浅淡奈曼旗目然因素, 人为因素与沙摸化的祸根.中国水土保持, 1989(1)
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备注/Memo
收稿日期:1993-3-1
基金项目:国家自然科学基金资助重大项目