粮食主产区非粮化耕地整治潜力与分区调控——以成都平原为例

Potential and differentiated control of non-grain cultivated land consolidation in major grain producing areas:A case study of the Chengdu Plain

非粮化耕地是耕地补充来源和用途管控的重点区域,科学识别非粮化耕地整治潜力并对其进行分区调控是落实新时期耕地保护目标的重要基石。论文以成都平原为研究区,遵循“内涵界定—潜力识别—分区调控”的研究思路,基于非粮化耕地整治潜力系统解析,统筹资源环境适宜性和社会经济约束性构建非粮化耕地整治潜力评价体系,明晰非粮化耕地理论和现实整治潜力阈值及其空间分异特征,借助两维图论聚类算法构建非粮化耕地整治潜力分区并提出调控策略。结果表明:(1)研究区非粮化耕地理论整治潜力面积为2461.14 km^(2),空间分布呈现不均衡性;(2)研究区非粮化耕地现实整治潜力约束系数对不同县(市、区)的影响强度存在差异性,规划管控约束、耕作条件约束、经济支撑约束和社会意愿约束下的非粮化耕地整治潜力分别为2348.31、1347.89、1676.52和1292.74 km^(2);(3)按照“约束类型+时序引导”的规则可划分5类整治潜力分区,不同分区之间的约束类型组合与整治时序安排可为差异化调控策略提供依据。研究结果可为成都平原强化耕地“非粮化”治理和保障耕地“进出平衡”制度实施提供科学支撑。

Non-grain cultivated land is the key area of cultivated land supplementary source and use control.Realizing the objective of protecting cultivated land in the new era depends on scientifically determining the potential of non-grain cultivated land consolidation and clarifying the differentiated control strategies.Taking the Chengdu Plain as the study area,this study developed a research framework of"connotation definition-potential identification-differentiated control".Based on a systematic analysis of non-grain cultivated land consolidation potential,the theoretical potential of non-grain cultivated land consolidation was clarified by identifying nongrain cultivated land patches and applying relevant resource and environmental carrying capacity and territorial spatial development suitability evaluation methods.On this basis,an evaluation system for the actual potential of non-grain cultivated land consolidation was constructed,which includes planning and control constraints,farming condition constraints,economic support constraints,and societal willingness constraints.Finally,the two-dimensional graph theory clustering algorithm was used to develop the non-grain cultivated land consolidation zoning,and the control strategies were proposed.The results show that:1)The agricultural production conditions of non-grain cultivated land on the Chengdu Plain are favorable.The theoretical potential area of non-grain cultivated land consolidation is 2461.14 km^(2),which shows a spatially imbalanced distribution.2)The coefficients of planning and control constraints,farming condition constraints,economic support constraints,and societal willingness constraints are 0-0.43,0.25-0.70,0.18-0.86,and 0.41-0.77,respectively.Correspondingly,the actual potential area of non-grain cultivated land consolidation is 2348.31 km^(2),1347.89 km^(2),1676.52 km^(2),and 1292.74 km^(2).There are significant differences in the actual consolidation potential scale driven by multi-factor constraints.3)Using the"constraint type+timing"method,the non-grain cultivated land consolidation areas on the Chengdu Plain was divided into five zones.The combination of constraint types and consolidation timing arrangement of different zones determines the differentiated non-grain cultivated land consolidation control strategy.The results of this study provides some scientific support for strengthening the governance of cultivated land non-grain use and ensuring the implementation of the"balanced entering and exiting"system of cultivated land on the Chengdu Plain.