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杨树沟小流域自2003年被国家批准列入大凌河流域水土保持重点治理区项目后,截止2007年,共治理水土流失面积667 hm2,治理程度达76.8%。为了客观评价水土保持措施实际发挥的效益,根据调查观测及有关统计资料,采用静态分析法计算治理期各项措施产生的直接经济效益。结果表明:该流域水土保持综合治理工程建设的累计经济效益呈现逐渐增加的形势,而且增产幅度随运行期增加产生的效益逐年扩大。由于流域综合治理措施发挥了作用,增强了蓄水保土能力,经济效益、社会效益、生态效益都得到了很大提高。
Since Yangshugou catchment was approved by the state in 2003 as a key control area for water and soil conservation in the Daling River Basin, by the end of 2007, a total area of 667 hectares of water and soil erosion has been treated and the degree of governance has reached 76.8%. In order to objectively evaluate the actual benefits of soil and water conservation measures, the direct economic benefits arising from various measures during the governance period are calculated by static analysis based on the survey observations and relevant statistical data. The results showed that the cumulative economic benefits of the comprehensive management of soil and water conservation in the basin showed a gradual increase, and the benefits of increasing the yield with the increase of the operation period were expanding year by year. As a result of integrated watershed management measures have played a role in enhancing soil and water conservation capacity, economic, social, ecological benefits have been greatly improved.