An Analysis on Dynamic Changes of Soil Erosion in Semiarid Loess Area Based on Uniform Sampling

ZHAO Wei-jun; LIU Xian-chun; ZHANG Yan; ZHU Qing-ke; YAO Wen-jun

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An Analysis on Dynamic Changes of Soil Erosion in Semiarid Loess Area Based on Uniform Sampling

- An Analysis on Dynamic Changes of Soil Erosion in Semiarid Loess Area Based on Uniform Sampling
- Bulletin of Soiland Water Conservation Vol. 32, Issue 4, Pages: 125-130(2013)
- 作者机构：
  
  1. 水土保持与荒漠化防治教育部重点实验室北京林业大学,北京,100083
  2. 水利部水土保持监测中心,北京,100053
- 作者简介：
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- Published：2013
- 稿件说明：
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ZHAO Wei-jun, LIU Xian-chun, ZHANG Yan, et al. An Analysis on Dynamic Changes of Soil Erosion in Semiarid Loess Area Based on Uniform Sampling[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 125-130.
DOI：

ZHAO Wei-jun, LIU Xian-chun, ZHANG Yan, et al. An Analysis on Dynamic Changes of Soil Erosion in Semiarid Loess Area Based on Uniform Sampling[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 125-130. DOI：

摘要

为评估近年来植被恢复对土壤侵蚀强度动态变化的影响

按照1%的均匀抽样比例分别于2009和2011年调查了陕北吴起县39个小流域的土壤侵蚀影响因子

结合2009年SPOT多光谱影像遥感解译的土地利用结果

分析了抽样方法的精度和吴起县土壤侵蚀动态变化及其影响因素。结果表明:(1)1%的抽样比例能够很好地代表吴起县整体土壤侵蚀状况;(2)2009-2011年吴起县微度侵蚀等级面积比例显著增加

中度、强烈、极强烈和剧烈侵蚀等级比例均有不同程度的减少

强烈侵蚀和剧烈侵蚀的面积比例都减少了5%以上

但不同小流域的土壤侵蚀变化差异较大;(3)土壤侵蚀变化的原因主要是2011年降雨侵蚀力低于2009年;与2009年相比

2011年灌木林面积减少

而草地和林地面积增加

但各种类型植被的覆盖度都有增加

因此

植被因子明显减小。其他因子变化不大。

Abstract

The aim of this study is to assess the effect of vegetation restoration on soil erosion dynamic changes in recent years.Based on the uniform sampling(1%)

the impact factors of soil erosion were surveyed in 39watersheds in Wuqi County

Northern Shaanxi Province in 2009and 2011respecitively.With the comparison of land use interpreting result from 2009SPOT multi-spectral image

the accuracy of the sampling method

soil erosion dynamic changes and the impact factors were analyzed in Wuqi County.The results showed that:(1)The 1%uniform sampling ratio could well represent current situation of soil erosion in Wuqi County.(2)From 2009to 2011

the area of slight erosion increased significantly

while the proportion of moderate

intensive

extreme intensive and severe erosion has reduced in varying degrees.All the areas of intense erosion

extreme intensive and severe erosion decreased by more than 5%

while the erosion intensity varied significantly within the single watershed.(3)The main reason that causes soil erosion changes was the rainfall erosivity

which was smaller in 2011than in 2009.Compare to 2009

although the area of shrub land decreased

the area of grassland and all the other types of vegetation cover increased in 2011.Due to this

the soil conservation biological factor decreased

and the changes of other factors were small.

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