Study on three-dimensional measurement of recessive farmland use morphology and its regional types:A case of the Huang-Huai-Hai Region
This paper focuses on exploring the spatio-temporal evolution characteristics of recessive farmland use morphology in the process of rapid industrialization and urbanization.Aiming at the recessive farmland use morphology,we innovate the theoretical perspective and analytical framework from"input morphology,output morphology and scale potential morphology",propose theoretical hypothesis and conjecture,and try to quantify the recessive morphology.We take typical large-plain agricultural area(Huang-Huai-Hai Region)as the study area,and then carry out quantitative measurement,spatio-temporal analysis and regional types classification of recessive farmland use morphology,and confirm the theoretical hypothesis.The conclusions are as follows:(1)From 2000 to 2020,the comprehensive level of recessive farmland use morphology in the study area was continuously optimized,showing a spatial differentiation pattern of"higher in the south and lower in the north",and the North-South differentiation was constantly widening.(2)The input morphology and scale potential morphology of each unit in the study area differentiated slowly,the output morphology differentiated rapidly,and finally the three-dimensional recessive morphology showed a significant differentiation trend.(3)Theoretical hypothesis was generally confirmed:the overall input morphology in the study area was optimized first and then encountered negetive factors,which was attributed to the off-farm transfer of a large quantity of agricultural labor,slow agricultural mechanization and controlled application of chemical fertilizer.The output morphology was steadily and significantly optimized,and the scale potential morphology was accelerated for optimization.(4)There were 8 types of recessive farmland use morphology in the study area,which have formed obvious spatial differentiation by 2020.The input-significant type,output-significant type and input-output-significant type were mainly concentrated in the southern part of the study area(Jiangsu,Anhui and Henan).The scale-significant type mainly clustered in coastal plain of the Bohai Sea in the north.The comprehensive weak type was confined to marginal zones,while the general development type filled the remaining large number of areas.(5)The study area should strengthen agricultural mechanization,and modernization in the future,and cope with the input vacancy of agricultural labor timely;be vigilant against the dependence and ecological risk of chemical fertilizer;focus on the weakening of social security function by"non-grain"of farmland;promote new urbanization and create opportunities for moderate-scale operation of farmland;guide the spatial coupling of three-dimensional recessive morphology,so as to release the benefits and potential of farmland at a high level.
agricultureinput-outputscale of operationland use morphologyland use transitionsHuang-Huai-Hai Region
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