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Assessing soil erosion risk in karst area using fuzzy modeling and method of the analytical hierarchy process

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Abstract

Soil erosion is a geo-ecological problem in Southwest China, which can result in karst rocky desertification when it is very serious. The grade delineation of soil erosion risk can be used as a guide for controlling regional and hierarchical soil erosion, and provide scientific references for restraining rocky desertification. Chaotian Town, an area of Karst Mountains and hills in Guilin, northeast part of Guangxi Zhuang Autonomous Region, China, was chosen as the study area. Settlement buffer, roadway buffer, lithology, slope, elevation, and aspect were selected as the main indicators of soil erosion in the karst area. After the indicators were scored by fuzzy modeling, the potential risk of soil erosion was quantified using indicator-weight union method. Five grades of soil erosion risk were delineated based on Geographic Information System. The grades of minimal, low, medium, high, and extreme soil erosion risk accounted for 1.62, 19.46, 52.35, 24.86, and 1.71 %, respectively. As a whole, the soil erosion risk was moderate, because the proportion data of different grades of soil erosion risk were a normal distribution, and about 52.35 % of the study area was in the medium grade. Soil erosion risk was higher in the southeast of the study area and lower in the northwest. Obvious variances have been found in the grade distribution of soil erosion risk, corresponding to different indicators.

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Acknowledgments

This research was supported by the National science and technology support program (NO. 2012BAC16B02), the Guangxi Natural Science Foundation (NO. 2012GXNSFAA053186), the Remote Sensing Survey and Ground Monitoring on Karst Rocky Desertification in Southwest China (NO. 1212011220958), the Ministry of Water resources of China (Grant No. 2005SBKK05), the Ministry of Science and Technology of China (Grant No. 2010BAE00739), and the Institute of Karst Geology, CAGS (Grant No. 2012015). We would also like to thank Dr. James W. LaMoreaux for his valuable comments and Ms. Lily Zeng for polishing the English language of the paper, which greatly improved the original manuscript.

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Authors and Affiliations

  1. Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China

    Qiyong Yang, Yunqiu Xie, Zhongcheng Jiang, Hui Li & Xingming Qin

  2. College of Resources and Environment and Tourism, Hunan University of Arts and Science, Changde, 415000, China

    Wenjun Li

  3. College of Environment and Resources, Guangxi Normal University, Guilin, 541004, China

    Hui Li

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  1. Qiyong Yang
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  2. Yunqiu Xie
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  4. Zhongcheng Jiang
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  5. Hui Li
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Correspondence to Qiyong Yang.

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Yang, Q., Xie, Y., Li, W. et al. Assessing soil erosion risk in karst area using fuzzy modeling and method of the analytical hierarchy process. Environ Earth Sci 71, 287–292 (2014). https://doi.org/10.1007/s12665-013-2432-x

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  • DOI: https://doi.org/10.1007/s12665-013-2432-x

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