农用地生态功能价值的评估——以宜兴农用地系统固定CO_2释放O_2生态价值评估为例

借鉴了生态系统生态价值评估的理论,对农用地的生态价值、价值评估作了简要介绍。以宜兴市农用地作为实例研究,运用植被第一性生产力的Miami模型计算了农用地净第一性产量,根据光合作用方程式计算了固定CO2释放O2的量。最后,采用造林成本法、碳税率法、工业制氧法对宜兴农用地固定CO2释放O2生态价值进行评估,宜兴市农用地系统固定CO2释放O2生态价值评估结果为102 951.29万元/a。

Assessment of Value of Ecological Function in Farmland

The ecological value of farmland and the value assessment was introduced using the ecological value assessment theory of the ecosystem.Taking the farmland in the city of Yixing as an example,the Miami model in the primary productivity of the vegetation was used to assess the net primary output of the farmland,and the equation was used to calculate the amount of O2 released from fixed amount of CO2.Finally,the ecological value of the O2 released by the certain amount of CO2 was assessed by afforestation cost,carbon tax rate and industry making oxygen.The results showed that the assessment in Yixing was 1 029.512 9 million RMB per year.