基于外部性理论的成都市耕地资源价值测算

Positive externalities value farmland resources estimate of Chengdu

在耕地资源外部性价值外溢且没有内部化的情况,我国耕地一直没有得到有效保护,耕地面积仍持续减少。耕地资源的外部性价值是指社会功能价值和生态服务功能价值的总和。以成都市为例,对其耕地资源正外部性价值进行定量评估。计算结果显示:成都市耕地资源的外部性价值为219.68万元/hm2。其中,社会保障价值88.64万元/hm2,社会稳定价值为119.50万元/hm2,生态服务功能价值为11.54万元/hm2。耕地资源外部性价值中社会服务功能价值所占约为94.75%,生态服务功能价值所占比例为5.25%。由此可知耕地系统不同于其他绿地生态系统,它的外部性价值更多体现在社会服务功能上。在耕地外部效益价值计量化的基础上,为探讨耕地外部效益"内部化"的途径以及建立合理的耕地保护体系提供了依据。

In the case of spillover of external value of arable land resources and without internalization, the ar- able land has not been effectively protected. External value of arable land resources refers to the social func- tion value and ecosystem services value. A Case Study, a quantitative assessment of its external value of arable land resources is made based on practices in Chengdu. The results showed that the external value of farmland resources is 2. 1968 million yuan/hm2. Among them, the social security value reaches 886,400 yuan/hm：, social stability value of 1. 195 million yuan/hm2, ecological services function value is 115,400 yuan/ hm2. the share of social services values of arable land resources in the external value reaches 94.75 % , and the pro- portion of ecological service function value reaches 5.25%. The arable system differs from other green space ecosystem ; its external value reflected in its social services in greater degree. The measurement of the external benefit value of arable land for external benefits provided basic approaches and methods of internalization for external value of arable land resources and reasonable farmland protection system.