Changes of land quality based on system dynamics

In order to comprehensively analyze the changes of land quality affected by land consolidation and reveal the variation of land system caused by projects along with land problems, system dynamics was used to simulate the land quality changes based on Vensim software. The results showed that under current model, areas of grassland and garden were increased after land consolidation, and area of cultivated land firstly was increased and then decreased, while the land quality was improved at beginning and then deteriorated. Supposing the residual field ridge was changed into cropland and unutilized lands were exploited into cropland, the monetization representation of land quality, the ecological service value of cultivated lands and the total value reached maximum in 2012, and subsequently decreased. This monetization representation of land quality was also represented by the maximum value in various scenarios. The results can provide a basis for optimal allocation of land resources and promote the coordinative development of land, economic, social and ecological system.