Research on Ecological Harmony Model Based on Multi-scale Coupling Dynamic Model and Efficiency Evaluation Model

The transformation of agricultural ecosystem has a profound impact on ecological balance. In order to achieve sustainable development, it is necessary to master the ecological coordination model. In this paper, multi-scale coupling dynamics model and efficiency evaluation model are used to analyze the dynamic changes of forest-agricultural conversion ecosystem. The multi-scale coupling dynamics model uses the Logistic growth model and the improved Lotka-Volterra equation to describe the population interaction, establish the agricultural ecological network, and solve the system stability through differential equations. The efficiency evaluation model evaluates the advantages of organic agriculture from the ecological, economic and sustainability dimensions, and constructs the optimization equations of pest control, soil nutrient balance and economic benefits. The results showed that the rational use of pesticides could achieve a balance between agricultural production and ecological stability, while organic agriculture had more advantages in pest control, species diversity and system stability than traditional agriculture. The analysis of the dynamic equations of migratory species further reveals the adaptability of agroecosystems to alien species.