基于能值分析的土地开发整理后效益评价

Emergy-based analysis of expost benefits of land exploitation and consolidation

土地整理项目后效益评价是土地开发整理事业可持续发展的重要条件。为完善土地整理项目后效益评价指标体系,促进土地开发整理的可持续发展,应用能值分析方法,以山东省淄博市杨峪地域土地整理项目为例,对土地开发整理前、后自然环境与人类社会系统能值输入与输出的变化进行分析,研究土地开发整理的后效益。结果表明,项目实施后项目区土地利用结构发生变化,总能值投入产出比增加,取得明显的经济效益、社会效益。但由于项目区开发了大面积未利用土地,造成土地环境负荷率加大,土地可持续利用指数降低。分析认为,在土地开发整理时,要尽可能减少土地开发,增加土地整理,最大限度不破坏生态系统的整体性,维持生态系统的稳定。

The analysis on expost benefits is regarded as an essential contributor to sustainable development of land exploitation and consolidation.In order to improve efficiency evaluation index system on expost benefits of land exploitation and consolidation project,Yangyu Valley regional land consolidation project in Zibo City,Shandong Province,was taken as a sample for empirical research.The solar energy of factors before and after land consolidation and eco-efficiency of land consolidation were calculated by the emergy theory.The results indicated that,after the project carried out,the land use structure of the project area had changed and the total emergy input-output ratio had increased.The economic and social benefits were significant.But since large uncultivated land had been developed in project area,it reduced the land environmental loading index and energy-based sustainable index.From the results,it can be concluded that,it is necessary to reduce the uncultivated land development and increase the land consolidation,and to protect the biodiversity to the largest extent and keep the stability of the ecological and economic systems.