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《Journal of Northwest A & F University(Natural Science Edition)》 2011-01
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Study on comprehensive benefits of soil and water conservation of small watershed in semi-arid loess hilly region based on catastrophe progression method

JIAO Jin-yu1,GUI Li-de2,HE Qi-ming1,YANG Dong3(1 Department of Geography,Dingxi Teachers'College,Dingxi,Gansu 743000,China;2 Institute of Soil and Water Conservation of Dingxi City,Dingxi,Gansu 743000,China;3 College of Geography and Environmental Sciences,Northwest Normal University,Lanzhou,Gansu 730070,China)  
【Objective】 Catastrophe fuzzy membership function produced by combination of catastrophe and fuzzy mathematics theory was used to study problems about integrated multi-objective evaluation of soil and water conservation effectiveness of small watershed in semi-arid loess hilly region.【Method】 Catastrophe progression method was used to decompose contradictory multi-objective level of the small watershed comprehensive benefits in accordance with the requirements of catastrophe theory.This study evaluated comprehensive benefit of soil and water conservation of small Anjiapo watershed in semi-arid loess hilly region with 16 evaluating factors selected from 4 aspects on the basis of effectiveness,economic efficiency,ecological benefits and social benefits.【Result】 Anjiapo small watershed comprehensive benefit from 1960 to 1990 has two distinct growth periods,growing steadly since 2000.Ecological and economic environment of small watershed has entered into a virtuous circle simultaneously.【Conclusion】 Integrated catastrophe index of Anjiapo watershed soil and water conservation showed a fluctuated increase.The conclusion is consistent with the field survey.Examples showed that the progression method is reasonable,objective and feasible.It provides a new idea to solve multi-objective evaluation on soil and water conservation comprehensive benefits of small watershed in semi-arid loess hilly region.
【Fund】: 国家自然科学基金项目(40599424 40473006);; 甘肃省教育厅高校社科项目“西部县域经济发展研究”(0619B-01)
【CateGory Index】: S157
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