A STUDY ON THE DYNAMIC CHARACTERISTICS OF SOIL EROSION AND ECO-BENEFIT EVALUATION IN KARST REGION ——A Case Study on Qingzhen Demonstrating Site of Returning Farmland to Wood( Grass) , Guizhou
A STUDY ON THE DYNAMIC CHARACTERISTICS OF SOIL EROSION AND ECO-BENEFIT EVALUATION IN KARST REGION ——A Case Study on Qingzhen Demonstrating Site of Returning Farmland to Wood( Grass) , Guizhou
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发表时间：
2003
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通讯作者：
M. Zai
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作者：
M. Zai
土壤侵蚀是喀斯特地区生态环境退化的重要因素，严重制约着喀斯特地区农业的可持续发展。如何合理利用坡耕地资源（如植物资源）是控制水土流失、改善生态环境的关键。清镇示范区土壤侵蚀监测结果表明，通过退耕还林，土壤侵蚀模数由2000年的2500~5000 t/ km 2·a减少到2002年的78.4~ 185.7t/ km 2·a，使32.16km2土地减少表土流失38563.6t，相当于每年减少化肥损失886.96t。生态效益、经济效益和社会效益十分明显。
Soil erosion, an important factor to ecological degradation, seriously controlled the sustainable development of agriculture in karst region. How to make use of the resources in slope land(such as the plant resources)is the key to control soil erosion and improve ecoenvironment. The soil erosion monitoring results in Qingzhen demonstrating site proves that the soil erosion mold number reduced from 2500~5000 t/ km2·a in 2000 to 78.4~185.7 t/ km2·a in 2002 through reforestation, which makes 32.16 km2 land reduced 38563.6 t of topsoil lose, equals to reducing 886.96 t of chemical fertilizer lose every year. So, the ecologic, economic and social benefits is very obvious.