基于生态环境需水的大凌河生态系统服务功能价值评估

目前对河流生态系统服务功能价值的评估,均没有考虑河流生态环境需水的问题。河流的来水量如果达不到河流生态环境需水量,河流的生态系统服务功能将不能正常发挥。对大凌河生态系统服务功能进行分类,用市场价值法、代替花费法和机会成本法经行计算,并且在计算供水功能价值、贮水功能价值和输沙功能价值时考虑了河流的生态环境需水,其它功能的实现也是在满足河流生态环境需水的基础上。结果表明：直接使用价值为92.64亿元/a,间接使用价值为215.17亿元/a,总价值为307.81亿元/a。通过分析,得出大凌河河流生态系统的核心服务功能是调蓄洪水功能、水产品功能和栖息地功能,应在充分发挥核心功能的同时兼顾其它功能。

Evaluation on the service function of River Dalinghe ecosystem based on ecological water requirement

At present the research about evaluation on the service function of river ecosystem all did not consider the problem of river’s ecological water requirement.If the river’s inflow can not reach river’s ecological water requirement,the service function of river ecosystem will not normal to play.Based on the classification of the service function of River Dalinghe ecosystem,market value method,cost substitution method and opportunity cost method were used in the calculation in this paper,and river’s ecological water requirement was considered in the calculation of the water supply function value,the storage water function value,and the sediment transport function value,and the other function also realized on the basis of it.The results showed that： the direct using value is 9.264 billion yuan per year,the indirect using value is 21.517 billion yuan per year,the total value is 30.781 billion yuan per year.Through the analysis,concluded that the core service function of River Dalinghe ecosystem is functioned water function,aquatic products function and habitat function.It should be given full play to the core function and taken the other function into ac-count.