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| Suitability evaluation of typical soil and water conservation measures in hilly areas of purple soil |
| Dai Fuqiang1, 2,3, Liu Gangcai1, 4 |
| 1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Resources, 610041, Chengdu; 2. College of Tourism and Land Resources, Chongqing Technology and Business University, 400067, Chongqing;
3. Graduate University of the Chinese Academy of Sciences, 100039, Beijing; 4. Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, 610041, Chengdu: China |
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Abstract In order to select soil and water conservation (SWC) measures appropriately, both Delphi method and fuzzy sets were used to evaluate the suitability of typical SWC measures in hilly areas of purple soil. Evaluation indices were selected based on questionnaire and two evaluation index systems were established from the point of view of requirement-supply and output-expectation respectively. The membership function was set up for each of index according to the relationship between the index and the suitability of SWC measures. Delphi method was used to determine the weights of indices and SWC suitability index was calculated by combining weighted sum with geometric mean. A case study was conducted from Qunli Village in Suining City, Sichuan Province. The results reveal that the specialists place emphasis on the benefits of soil and water conservation as well as natural environment improvement, while the local farmers pay attention to economic benefits of SWC measures. The suitability indices imply that converting cropland to grassland and to forest are more suitable for Qunli Village, in comparison with terrace and contour tillage. It is consistent with the implemented area of these four measures since 1990. The low suitability of terrace and contour tillage is attributed to the factors including lack of labor and investment and low economic benefits.
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Received: 11 January 2011
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