Estimation of Natural Erosion and Accel erated Erosion of Human Action on Loess Pl ateau —Taking Ansai County as an Example

Jia Shaofeng

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Estimation of Natural Erosion and Accel erated Erosion of Human Action on Loess Pl ateau —Taking Ansai County as an Example

- Estimation of Natural Erosion and Accel erated Erosion of Human Action on Loess Pl ateau —Taking Ansai County as an Example
- Bulletin of Soiland Water Conservation Vol. 14, Issue 4, Pages: 25-32(1995)
- 作者机构：
  
  中国科学院国家计划委员会地理研究所,北京市,100101
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- Published：1995
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Jia Shaofeng. Estimation of Natural Erosion and Accel erated Erosion of Human Action on Loess Pl ateau —Taking Ansai County as an Example[J]. Bulletin of Soiland Water Conservation, 1995, 14(4): 25-32.
DOI：

Jia Shaofeng. Estimation of Natural Erosion and Accel erated Erosion of Human Action on Loess Pl ateau —Taking Ansai County as an Example[J]. Bulletin of Soiland Water Conservation, 1995, 14(4): 25-32. DOI：

摘要

植被具有很好的水土保持作用。已有的研究成果证实：当森林郁被度或植被群落总盖度或森林覆盖度达到40％左右时，植被的水土保持效益发生质的飞跃，较之裸荒地可减少土壤流失50％以上；当植被群落总盖度达到80％时，就能基本控制水土流失。目前黄土高原的植被很差，以安塞县为例，林草总覆盖度只有45％，而且群落盖度很低，大多在30％～50％。而若无人类破坏，在同样的气候、地质条件下，安塞县的自然植被类型为森林和疏林灌丛草原，植被群落总盖度在80％、乃至90％以上，根据植被的水土保持规律和有无人类破坏情况下的植被对比情况，计算了黄土高原安塞县无人类破坏情况下的自然侵蚀及其占目前的总侵蚀量的比重。结果表明：位于黄土高原丘陵沟壑区的安塞县，自然侵蚀仅占总侵蚀量的9．55％，按最不利的情况估计也只占16．76％，而若按较有利的情况估计则只占12．03％。说明人为加速侵蚀占目前黄土高原总侵蚀量的绝大部分。

Abstract

It is showed by many studies that vegetation has very strong effect on water and soil conservation. When the total vegetation coverage density of plant community is great than 40%

vegetation can diminish more than 50% of the total soil erosion with respect to naked land.If the total coverage density of plant community is great than 80%

vegetation will basically control all the soil erosion.Now

under the condition of human disturbing

the real vegetation coverage density on loess plateau is generally lower than 40%.If there were no human action of clamate and geology

under the same condition the total vegetation (whether forest or steppe) great than 80% on loess plateau according to the ecologic theory and the coverage density would be remnant good vegetation in some rare areas on loess plateau.Through the comparison of the real vegetation and the possible vegetation under the condition of no human action to all kinds of land

we come to the conclution that the accelerated erosion by human action is about 90% of the total erosion at present on loess plateau.

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