Coupling relationship of ecological agro-system with commodity under grain for green project in Ansai County

Based on changes in the coupling relationship of ecological agro-system of commodities (EASC) under “Grain for Green Project”, the coupling evolution of agricultural eco-economic system in Ansai County was analyzed by utilizing the coupling degree model. The results showed that the coupling evolution of EASC could be compartmentalized into 4 phases: coordinated development, worn development, stressed degeneration, and reconversion. The composite evaluation index of agricultural eco-economic system in Ansai County was enhanced significantly from 1998 to 2008. The coupling evolution in Ansai County had experienced the stressed degeneration, reconversion and coordinated development phase. According to coupling degree fitting curves and coupling type classification, the current coupling relationship of EASC in Ansai County was in continual harmonizing situation. In future, positive coupling situation would be formed by optimizing the structure of agricultural resources and enhancing the consistency between agricultural production and resources.