区域土地开发整理新增耕地潜力及其贡献分析

为了指引重庆市土地开发整理项目的时空配置，保障区域“耕地数量和质量占补平衡”，从单位可整理面积新增耕地潜力出发，应用等级折算系数法，分别测算了耕地整理、农村居民点整理、未利用地开发和土地复垦新增耕地潜力，并借助分层聚类法划分出单位新增耕地潜力区，阐明了不同土地开发整理类型对区域新增耕地总潜力的贡献率。结果表明：重庆市不同土地开发整理类型按等折算单位可整理面积新增耕地潜力存在显著区域差异。耕地整理单位潜力Ⅰ、Ⅱ级区主要分布在渝东北中山区和渝东南低、中山区；农村居民点整理单位潜力Ⅰ、Ⅱ级区主要分布在渝西方山丘

Analysis of potentialities and contribution rate of newly-increased cultivated land from land development and consolidation

Potential analysis of newly-increased cultivated land becomes an increasingly important part of the feasibility research for the spatial-temporal allocation of land development and consolidation project and quantity-quality balance of land requisition-compensation. Based on the perspective of newly-increased cultivated land on unit area, in this paper, potentialities of the newly-increased cultivated land from cultivated land consolidation, rural residential consolidation, unutilized land development and land reclamation were calculated by the method of conversion in accordance with grade, respectively. The various potential rank zones of newly-increased cultivated land on unit area were identified by hierarchical clustering method. Moreover, the contribution rate of the newly-increased cultivated land from land development and consolidation was studied. Results indicated that there were significant regional differences of newly-increased cultivated land on unit area from the four different types of land development and consolidation in Chongqing, in which cultivated land consolidation the northeast of low, medium mountains areas and the southeast of medium mountainous areas, rural residential consolidation the western of mountain and hilly areas, unutilized land development the western of mountain and hilly areas and the central of parallel to the ridge valley hilly areas, and land reclamation the western of mountain and hilly areas also with the northeast of low, medium mountains areas and the southeast of medium mountainous areas. Not only can the newly-increased cultivated land on unit area calculated by the method of conversion in accordance with grade closely link the quantity and quality of the newly-increased cultivated land to the grade distribution of the occupied cultivated land in Chongqing, but also can weak the influence of the total areas of land development and consolidation in different county on the real potential analysis of newly-increased cultivated land. Therefore, the results can provide scientific instruction for the spatial-temporal allocation of land development and consolidation project to make regional cultivated land requisition-compensation balance possible.