Research On The Cultivated Land Supply And Demand Balance In County Based On Results Of Agricultural Land Grading

The cultivated land is the essence of land, maintaining a certain amount and quality of cultivated land is not only the basis for the development and live for human,but also the key to food security. With the rapid social and economic development, industrialization and urbanization propulsion and ecological abandoned land, there has been large demand for cultivated land. What is more, the nationallife of vast population and limited cultivated land , and the lack of reserve cultivated land resource all make the contradiction more prominent. The cultivated land supply and demand balance requires not only the balance of quantity, but also to meet the balance of quality. Now,the research on cultivated land supply and demand balance lack research on the quality of supply. The agricultural land grading find out status of the cultivated land quantity and quality from the root, providing the basis of the quality of cultivated land supply, achieving balance on the double in quantity and quality of cultivated land .It can be not only for the preparation of a new round of land use planning to provide a basis and reference drawing, but also for social, economic and political stability to have important practical significance.On the base of research in domestic and foreign ,this paper probs the ideas of county land supply and demand balance based on the results of achievement agricultural land grading and analysis county land supply and demand balance of quality of supply making Lulong County, Hebei Province as an example to make a study. The main conclusions as follows:(1)It analysises the various factors affecting the demand of cultivated land from every angle,within minimum use of land-based food security demand method, forecasting the demand of land and food in the planning period.The result shows that it would require 46426.30 hm2 cultivated land and 195489.33 t food in Lulong County in 2020.(2)It analysises the various factors affecting reduction of cultivated land and forecasts the reduction in the planning period with different methods for different factors.The result shows that it would require 449.48 hm2 cultivated land for construction and loss 3966.07 t food largest; it would require 565.08 hm2 cultivated land for ecological restoration and loss 4245.71 t food in the largest;it do not occupy cultivated land fornatural disasters and agricultural restructuring. (3)It constructs the largest supply model of the cultivated land reserve resources development, consolidation, reclamation from the quantity and quality based on comprehensive analysis of the impact of land reserve capacity of the various factors, It enhancs the quantity and quality of supply accuracy of arable land for the government to provide a full and reliable data. The results show that it would increase 12470hm2 cultivated land and 94064.78 t food in the largest for reserve resources; It would increase 2079.2hm2 cultivated land and 18405.8 t food in the largest for consolidation; It would increase 56.40 hm2 cultivated land and 391.95 t food in the largest for reclamation.(4) It makes the empirical research using an example of Lulong in Hebei Province, The results show that it would require 46426.30 hm2 cultivated land and 195489.33 t food and provide 56931.21 hm2 cultivated land and 362826.80 t food in 2020 in Lulong County ,it achieve a balance of quantity and quality of the double by through comparison.