Study on Zoning of Fallow Land in the Chengdu-Chongqing Economic Circle Based on the Theory of Polarization and Trickle-down Effect
The purposes of this study are to introduce the theory of polarization and trickle-down effect into the research on fallow land,and to explore inter-provincial fallow land zoning control strategies and technical methods.The research methods are the PSR model,Grey GM(1,1)model and GIS spatial analysis.The results show that:1)the polarization grade of cultivated land in the Chengdu-Chongqing economic circle is relatively high,and the cultivated land conservation should be strengthened urgently.2)The constraint on the scale of fallow land is the amount of cultivated land based on the food security.The annual scale of fallow land in the Chengdu-Chongqing economic circle can reach 397.66 million ha objectively,the proportion of which can reach 35.11%of the total cultivated land in the study area.The two main cluster areas that present in the space of fallow land are"middle"and"east".3)According to the composite index,the study area is divided into four types,including priority fallow region,key fallow region,conditional fallow region and reserved fallow region.According to different types,different strategies of fallow land are put forward.In conclusion,the spatial allocation of fallow land is constrained by"polarization grade"and"fallow scale".The health status of cultivated land in the future deserves more attention and fallow land in different regions should be delineated reasonably based on the principle of regional food security.
fallow landzoningthe theory of polarization and trickle-down effectfood securityChengdu-Chongqing economic circle
万方数据
