永定河(北京段)河流生态系统服务价值评估

Evaluation of ecosystem services of the Yongding River in Beijing

借鉴《千年生态系统评估》中对生态系统服务的划分(供给、调节、文化与支持四项服务),建立生态服务价值评价指标体系,开展永定河(北京段)供水、调蓄洪水、气候调节、休闲娱乐、生物多样性等功能的调查研究,明确永定河(北京段)生态系统主要功能与服务.研究结果如下:永定河(北京段)生态服务总价值432.82亿元.其中供给功能价值为2.67亿元、调节功能价值为251.17亿元、文化功能价值为164.48亿元、支持功能价值为14.50亿元.可以看出,在永定河生态服务价值中,调节和文化功能占主导地位,约占总服务价值的90%以上.通过估算永定河生态系统服务价值,为制定永定河(北京段)生态修复目标和河道生态服务价值的评估提供一定的科学依据.

Based on the classification of ecosystem services（i.e.provisioning services,regulating services,cultural services and supporting services） in the ＂Millennium Ecosystem Assessment＂,an evaluation index system is set up which includes water supply,flood control,climate regulation,recreation,biological diversity and others to clearly assess the main ecosystem functions of the Yongding River in Beijing.Results show that the total value of the ecosystem services of the Yongding River in Beijing is 43.28 billion Yuan RMB at current prices.The values of the provisioning,regulating,cultural and supporting services are 0.27 billion,25.12 billion,16.45 billion and 1.45 billion Yuan（all in RMB）,respectively.Among the four different services,the regulating and cultural ecosystems account for over 90% of the total ecosystem values.This study provides theoretical basis for the ecological restoration of the Yongding River in Beijing and the assessment of river ecosystem services.