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

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.