Evaluation of Land Resource Carrying Capacity in China's Major Grain-producing Areas Based on DPSIR Model
The scientific evaluation of the land resource carrying capacity in major grain-producing areas provides a scientific basis for the sustainable use of land resources in major grain-producing areas and ensures national food security.Thirteen provinces(districts)of Heilongjiang,Jilin,Liaoning,Inner Mongolia,Hebei,Henan,Shandong,Jiangsu,Anhui,Jiangxi,Hubei,Hunan and Sichuan in the major grain-producing areas were selected as the research objects.Based on the driver-pressure-state-impact-response(DPSIR)model,an evaluation index system for land resource carrying capacity was constructed,and the analytic hierarchy process and entropy method was used to determine the comprehensive weight of the evaluation indexes.The development status of each subsystem of land resource carrying capacity in major grain-producing areas from 2000 to 2020 was analyzed,and the level and grade of land resource carrying capacity was evaluated.The results showed that in the subsystem of land resource carrying capacity of major grain-producing areas from 2000 to 2020,except the level of pressure subsystem showed a decreasing and then increasing trend,the levels of driver,state,impact,and response subsystems all showed a growing trend,with average annual growth rates of 5.78%,2.71%,3.79%,and 5.25%,respectively.From 2000 to 2020,the average level of land resource carrying capacity in major grain-producing areas showed a growth trend,growing from 0.224 7 in 2000 to 0.387 3 in 2020 at an average annual rate of 2.76%,with an increase of 72.36%.The average annual growth rate of land resource carrying capacity level in Jiangxi,Heilongjiang,Hubei,Henan,Hebei,Sichuan,Hunan,and Shandong exceeded the average level of major grain-producing areas.The land resource carrying capacity level in Heilongjiang,Liaoning,Jiangxi and Hubei increased from 2000 to 2020,while it decreased in Anhui,and fluctuated widely in Jilin,Inner Mongolia,Shandong and Hunan,and remained basically unchanged for a long time in Hebei,Henan,Jiangsu and Sichuan.There is an evident difference in the distribution of land resource carrying capacity of in major grain-producing areas.In 2020,the land resources of Liaoning and Henan were in a weak carrying capacity state,the land resources of Shandong and Anhui were in a low carrying capacity state,the land resources of Heilongjiang,Jilin,and Jiangxi were in a medium carrying capacity state,the land resources of Inner Mongolia,Hebei,Hubei,and Hunan were in a high carrying capacity state,and the land resources of Jiangsu and Sichuan were in a strong carrying capacity state.Socio-economic development and land resource utilization and protection policies are the main reasons affecting the land resource carrying capacity in major grain-producing areas.
万方数据
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