耦合连片度与宜耕性的耕地空间布局优化研究OACHSSCD

To address the coordinated development of"quantity—layout—quality"in cultivated land protection and explore optimization path cultivated land layout in ecologically sensitive areas,this study focuses on Junshan District,Yueyang City,and constructs a dual-driven evaluation framework combining"contiguity—cultivability".By constructing a 512 m-16 m non-uniform grid system,this study quantifies the indicators of contiguous degree including Purity Index(PI),Connectivity Index(CI),Fragmentation Index(FI),Shape Index(SI)and cultivability(topography,soil,location).The four-quadrant method was employed to divide optimized zones and propose differentiated management strategies.Results indicate:(1)Junshan District's cultivated land exhibits a"large concentration,small dispersion"pattern,with overall contiguous degree of cultivated land reaching 77.02%.However,83.19%of the 16 m grid units are fragmented,while the 64 m grid accommodates 27.30%of the cultivated land;(2)the cultivability is predominantly highly suitable(77.63%of area),spatially forming a high-quality agglomeration area in the northern plain and a transitional zone in the central region;(3)the study area is divided into four types of optimized zones based on the four-quadrant method:Core Protection Zones(high contiguous degree high cultivability,60.89%)prioritizing stable production capacity maintenance;Production Enhancement Zones(high contiguous degree low cultivability,18.72%)focusing on quality barrier remediation;Layout Optimization Zones(low contiguous degree high cultivability,19.35%)to advance the merger of small fields into large fields;Replacement Potential Zones(low contiguous degree low cultivability,1.04%)to establish a flood and drought coordinated withdraw mechanisms.