摘要
水土保持生态效应评价对了解水土保持措施的合理性、适宜性具有重要意义。根据水土保持生态效应在减少土壤侵蚀、减小地表径流、增加植被覆盖率和改善大气环境等四方面的成效机制,借鉴国内外有关生态效应评价指标体系的研究成果,建立了包含七个指标的评价指标体系,并采用组合赋权法确定各指标权重;针对实施水土保持措施后不同时间段内评价对象的生态响应,引入了指标的响应强度用于评价生态效应四大方面的改善程度,并通过计算评价对象的综合评价值揭示其总体响应趋势。通过对生态效应定量评价模型的实例分析发现,采用组合赋权法确定指标权重更为合理;生态效应中的保土和调水作用响应时间更短;水土保持措施对于改善生态环境是有积极作用的。
The evaluation of the ecological effect of soil and water conservation is of great significance to understanding the rationality and suitability of soil and water conservation measures. According to the effectiveness mechanism of ecological effect of soil and water conservation and its main function, including reducing soil erosion, and surface runoff, increasing vegetation coverage and improving the atmospheric environment, and combining the experience in doing research on the ecological effect evaluation index system at home and abroad, this paper establishes the evaluation index system with seven index elements. The weight of each index is determined by the combination weighting subjective and objective method. In order to evaluate the ecological response of the evaluation object in different time periods after the implementation of soil and water conservation measures, the response intensity of the index is introduced to evaluate the improvement of the four aspects of ecological effect, and the comprehensive evaluation value of the evaluation object is calculated to reflect its overall response to trends. By using the quantitative assessment model of ecological effects, we find that it is more reasonable to use the combined weighting method of subjective and objective weights to determine the weight of indicators ; and the response time of soil conservation and water transfer in ecological effect is shorter; and soil and water conservation measures have a positive effect on improving the ecological environment.
出处
《中国农村水利水电》
北大核心
2017年第7期75-78,共4页
China Rural Water and Hydropower
基金
水利部公益性行业科研专项经费项目资助(201501045)
关键词
水土保持
生态效应
组合赋权
定量评价
soil and water conservation
ecological effect assessment
combination weighting
quantitative evaluation
