Research On The Cultivated Land Protection Policy Based On SD

The cultivated landisthebasisoffood security and plays an irreplaceablerole in national economic developmentandsocial stability in China. Withthesocial and economic developmentofourcountry, theincreasing cultivated landprotectionissuesare facingserious challenges. How to strengthenthe protection of cultivated land, toensurethefood securityofourcountryisanimportant topicoftoday’s academic research today.The study uses System Dynamics as a research method and divides thecultivated landprotection policy system into five subsystems:the population subsystem, economic subsystem, food subsystem, cultivated land subsystem and construction land subsystem. Through the analysis of these systems, the study judges out the system boundary and internal variables. Two cultivated land protection policy are sorted out after selecting the variables of thecultivated land protection policy system: the proportion of financial support for agriculture and the balance of cultivated land pressure index as farmland protection policy entry point to the arable land, China’s grain yields and arable land supply and demand ratio variable as a reference. The use of Vensim software on quantitative model simulation and the analysis of the state of nature as well as three optimization state system simulation results in Fig.The research results show that the proportion of government financial support for agriculture and the balance of arable land pressure index for farmland protection and food security in China has a significant impact.If the financial support for agriculture is increase to10%and increase the index to the occupation and retrieval pressure to100%, the rate of decline in the number of China’s cultivated land can be slowed, and can greatly improve the single production of food and the supply and demand of the cultivated land. Onthe basis the study puts forward two proposals to promote the protection of cultivated land in China:increase financial support for agriculture, improve the quality of cultivated land and the food; improve the balance of cultivated land pressure, reduce the loss of cultivatedland.