竺山湾湖滨缓冲带生态工程综合效益评价——以江苏省宜兴市周铁镇为例

Evaluation on Comprehensive Benefits of Lake Buffer Zone Ecological Engineering in Zhushan Bay——Taking an Example of Zhoutie Town,Yixing City,Jiangsu Province

[目的]对江苏省竺山湾地区宜兴市周铁镇湖滨缓冲带生态工程的综合效益进行评价,定量分析生态工程建设的价值,为太湖及其他流域湖滨缓冲带生态工程建设效益评价提供借鉴和参考。[方法]在长期定点观测周铁镇竺山湾湖滨缓冲带生态工程建设和运行基础上,从生态、社会、经济3层面构建包括水质净化、涵养水源、保护生物多样性、大气调节、提供就业、科研教育、社会稳定、旅游休闲、提供水产品等内容的综合效益评价指标体系,运用成果参照法、影子工程法、旅行费用法、条件价值法、替代法、直接市场法等对各项指标价值进行评价。[结果]周铁镇湖滨缓冲带生态工程综合效益价值约为176.66万元/a,生态效益、社会效益、经济效益的价值分别为125.55,33.61和17.5万元/a,表现为:生态效益>社会效益>经济效益。单项指标价值对比发现,水质净化价值最大,达60.52万元/a,大气调节价值次之,为47.15万元/a。[结论]周铁镇湖滨缓冲带生态工程建设有效改善了湖泊水环境,生态效益最为显著,符合生态工程建设的生态效益优先原则。

[Objective] The objective of this research is to evaluate comprehensive benefits of ecological engi- neering in the lake buffer zone in Zhushan Bay in Zhoutie Town, Yixing City, Jiangsu Province to quantitatively analyze the value of ecological conservation and to provide a basis and reference for the benefit assessment of ecological engineering in Taihu Lake basin and other watersheds. [Methods] Based on long-term fixed point observation of the ecological engineering construction in Zhoutie Town, we build an evaluation system from three aspects of economy, society and ecology. Indicators of evaluation system include water purification, water conservation, protection of biological diversity, air modulation, providing employment opportunities, research and education, social stability, leisure tourism, aquatic production and so on. Methods of indicators value evaluation are reference method, shadow project method, travel cost method, contingent valuation method, substitution method and direct market method. [Results] The comprehensive benefit of lake buffer zone ecological engineering in Zhoutie Town is 1. 766 6 million yuan per year, including 1. 255 5 million yuan per year of ecological benefits, 336.1 thousand yuan per year of social benefits and 175 thousand yuan per year of economic benefits, that means ecological benefits〉social benefits〉economic benefits. The result of single index value comparison found that the value of water purification is largest, up to 605.2 thousand yuan per year. The following is the value of air modulation, which is 471.5 thousand yuan per year. [Conclusion] Ecological engineering in Zhoutie Town effectively improved the aquatic environment of lakes. The ecological benefit is most remarkable, which is in accordance with the principal that priority of ecological value is in priority in ecological engineering.