江汉平原农地保护的外部效益研究

农地保护外部效益的货币化计量可为缓解我国农地流失形势，制定及实施农地生态保护政策，探寻农地保护和经济发展的均衡点提供理论及决策依据。运用条件价值评估法估算江汉平原农地保护的外部效益，研究表明：①随着农地保护意识的增强，受访居民已意识到农地外部效益的存在，8550%的受访居民对农地有正的支付意愿；受访居民的性别、年龄、家庭人口(老年人口、参加工作人口)、经济状况(土地面积、月生活开支、职业)等特征对支付意愿有显著影响。②江汉平原农地保护的年均总支付意愿达2805×108元，折合单位农地的保护效益为48 658元/hm2；区内现有农地目前无法通过市场价格表现的外部效益约1 24682×108元，具有无法忽略的重要地位。

EXTERNAL BENEFITS IN PRESERVING AGRICULTURAL LAND IN JIANGHAN PLAIN

It is important to evaluate the external benefits by preserving agricultural land,because this can provide a scientific basis for rural urban land conversion decision making,and also decrease the risk of high quality agricultural land loss.In this paper,the authors use the contingent valuation method (CVM) to evaluate the external benefits of agricultural land preservation in Jianghan Plain based on 789 valid questionnaires.Several conclusions can be drawn from the study.Firstly,the residents (both farmers and urban citizens) recognize the external benefits of preserving agricultural land,based on an increased awareness of agricultural land protection.According to the survey,8550% of the respondents have a positive willingness to pay (WTP) to protect agricultural lands.Secondly,according to the residents’ WTP to protect local agricultural lands,the external benefits of preserving agricultural land may be quantified as at a total of 2805×108 RMB Yuan,being almost 48 658 Yuan per hectare.Nowadays,the external benefits of agricultural land preservation in Jianghan plain reach a total of 2 45623 hundred millions Yuan,which is about 9 fold of the whole gross domestic product of Xiantao City in Hubei Province.