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| Benefit evaluation on soil and water conservation practices:A case study on Rongleihe Watershed in Guizhou province |
| Yang Yang1, Liu Yuxin1, Jin Pingwei2, Xiang Jiaping2, Xie Yun1 |
| 1. State Key Laboratory of Earth Surface Processes and Resource Ecology, School of Geography, Beijing Normal University,100875, Beijing, China;2. Pearl River Watershed Soil Conservation Monitoring Center of Pearl River Water Conservancy Committee, 510611, Guangzhou, China |
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Abstract Assessing the benefits of soil and water conservation practices and discovering the problems present in their applications are of great significance to soil conservation planning, management and
operation. The latest national standard, i. e. , “Comprehensive control of soil and water conservation—Method of benefit calculation (GB/ T 15774—2008)冶,describes different kinds of benefits and their evaluation techniques. However, this standard involves too many evaluation items, some of which are difficult or even impossible to directly attain or calculate in practice. In addition, certain benefits are counted more than once using the evaluation techniques suggested. These shortcomings have greatly limited the application of this standard. In the current study, a new benefit evaluation method is proposed. Targeted, quantifiable and unique evaluation items are selected for the assessment of soil and water conservation benefits as well as the ecological ones. Furthermore, the value of each ecological benefit is calculated based on its ecosystem service function, using related economic theories. This method has been applied in the benefit evaluation of the integrated soil conservation project operated on Rongleihe Watershed in Guizhouduring 2008—2010. It is predicted that this project would reduce the annual runoff depth by 11.0 mm/ a and the soil erosion depth by 2.0 mm/ a; and yield a total ecological benefit of 107.1×104 yuan/ a. Among the six main practices, soil and water conservation forests top in conserving water and reducing runoff; whereas, terraces exhibit the strongest ability in protecting soil from erosion. This study values the ecological benefits of soil and water conservation practices,and its results hold important implications for local policy making with regard to soil and water conservation.
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Received: 16 January 2015
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