Risk Pattern Analysis of Soil Erosion Based on RUSLE and SPs一A Case Study of Diebu County,Gansu Province

YAO Yu; ZHANG Pei; YAN Li-jiao; FAN Ji

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Risk Pattern Analysis of Soil Erosion Based on RUSLE and SPs一A Case Study of Diebu County,Gansu Province

- Risk Pattern Analysis of Soil Erosion Based on RUSLE and SPs一A Case Study of Diebu County,Gansu Province
- Bulletin of Soiland Water Conservation Vol. 30, Issue 3, Pages: 161-167(2011)
- 作者机构：
  
  浙江大学生命科学学院生态规划与景观设计研究所,浙江,杭州,310058
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- Published：2011
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YAO Yu, ZHANG Pei, YAN Li-jiao, et al. Risk Pattern Analysis of Soil Erosion Based on RUSLE and SPs一A Case Study of Diebu County,Gansu Province[J]. Bulletin of Soiland Water Conservation, 2011, 30(3): 161-167.
DOI：

YAO Yu, ZHANG Pei, YAN Li-jiao, et al. Risk Pattern Analysis of Soil Erosion Based on RUSLE and SPs一A Case Study of Diebu County,Gansu Province[J]. Bulletin of Soiland Water Conservation, 2011, 30(3): 161-167. DOI：

摘要

土壤侵蚀是我国目前面临的重大生态问题之一。利用GIS技术和修正的水土流失方程(RUSLE)模型对降雨侵蚀造成的土壤流失进行预测估算是目前较为常用的一种土壤侵蚀研究方法。以RUSLE模型的基本构建方法为基础，结合景观生态安全格局理论，对甘肃省甘南州迭部县县域内的土壤侵蚀状况进行了估测性。分析了模型中各个作用因子在当地的分布及表现特点，并构建了该县的土壤侵蚀风险格局。提出在土壤侵蚀格局的关键点或地带，依靠坡改梯，增加护坡，种植等高植物篱，提高植被郁闭度等手法，提高流失斑块的破碎度，降低地表径流能量，弱化土壤侵蚀的规模化效应，以期起到解决或减弱当地土壤严重流失问题的作用。土壤流失风险格局也可以为土地利用格局的改造提供指导性依据。

Abstract

As one of the most serious ecological problem in China

soil erosion has attracted extensive attention.Currently

the RUSLE model and GIS technology are commonly used to estimate rainfall and runoff erosion.This study introduced the theory of security patterns(SPs)into the estimation of soil erosion based on RULSE and GIS

and then constructed a risk pattern of soil erosion for Diebu County in Gansu Province.The risk pattern proposed a series of specific solutions targeting the soil erosion

such as transforming slopes into terraces

enhancing the protection of slopes

increasing the vegetation coverage in the key point or zone in the risk pattern and so on.These methods would help enhance fragmentation of erosion patches

decrease erosive power of surface runoff

and weaken the scale-effect of erosion

and eventually decrease or solve the soil erosion problem. Besides

the risk pattern could also be used to guide the reform and change of land use patterns.

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