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| Current status and comprehensive countermeasures of soil erosion for Karst rocky desertification areas in the Southwestern China |
| Jiang Zhongcheng 1,Cao Jianhua 1,Yang Desheng 2,Luo Weiqun 1 |
| 1.Institute of Karst Geology,CAGS,541004,Guilin,Guangxi;2.Pear River Water Resources Commission,510611,Guangzhou: China |
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Abstract Some data from the scientific investigation activities for soil erosion and ecological safety in Karst rocky desertification areas in Yunnan and Guizhou Provinces and Guangxi Autonomous Region in 2005 and remote sensing analyses show that,the soil erosion area is 143 064.7 km2 in the investigation area of 553 thousand km2,with 110 counties which soil erosion area is over 30% of the total land area,and many rocky desertification areas where is no soil for erosion.The strong soil erosion make the rocky desertification area from 65 900 km2 in 1989 increase to 88 100 km2 in 1999 and a lot of mud and sands deposited in the underground rivers.The investigation areas includes Karst plateau,Karst peak-cluster depression,Karst fault basin,Karst gorge,Karst peak-forest plain and Karst trough valley,six types of Karst landforms.Therefore a planning of soil and water conservation should be made firstly according to the environmental features of each Karst type.Because there are a lot of poor presents and leak bases of soil and water conservation in the Karst areas of the Southwestern China,it is necessary to arrange a state project for comprehensive control of soil erosion by government.In the project,the example sites,control of soil erosion combining with improving of production and life conditions of local farmers,should be gone on firstly,then spread to all Karst rocky desertification areas.Meanwhile,some preferential policies such as a special rule of the soil and water conservation,ecological compensation and ecological emigrant should be made.Moreover,the scientific researches of soil erosion in the Karst areas should be enhanced.Not only to study the reasonable standard of water and soil loss in the Karst areas,but also to study the special engineering and biological measures in the Karst areas,especially the ways of the natural rehabilitation of the Karst rocky desertification areas.
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Received: 30 November 2007
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