Abstract:

The deterioration of the ecological environment caused by soil erosion has become China's important ecological security problems. Comprehensive control of soil erosion is a multidisciplinary, comprehensive systems engineering, which plays an important role in reducing soil erosion and improving the ecological environment. It's important to control the scientific decisionmaking of soil and water loss, identify the implementation effect and promote the technology of soil and water conservation with a scientific and reasonable benefit evaluation. Focusing on the information shield and incompatibility of single index evaluation resulted in the comprehensive benefit evaluation of soil and water conversation, this paper adopted the matterelement extension model to evaluate water and soil conservation projects from World Bank and Europe union in six counties of Hubei Province. The results showed that the projects of ecological benefit above grade Ⅱ level accounted for 83.3% of all evaluated objects, and the proportion of economic benefit above grade Ⅱ level was 50%. The social benefit of all objects was above grade Ⅱ level. This indicated the whole project had better ecological, economic and social benefits. Lichuan's comprehensive benefit of soil and water conservation was grade Ⅰ level. Changyang and Xishui were of grade Ⅰ level trend, but Changyang had more potential than Xishui. Hongan and Macheng had the potential to transfer to grade Ⅲ level. Yiling's comprehensive benefit of soil and water conservation was the lowest. The projects of comprehensive benefit above grade Ⅱ level accounted for 83.3% of the whole evaluation objects. Implementation of the project made good ecological, economic, social benefits, and the overall project implementation effect was good. The evaluation result based on matterelement extension model was consistent with the result of traditional comprehensive index evaluation method, and indicated that this model was reliable. Matterelement extension model to solve the problem of incompatible factor evaluation grade of all the benefits of soil and water conservation had a wide application in the future, but the evaluation of matterelement classical domain and joint domain still needed to be further studied