江苏省耕地细碎化评价与土地整治分区研究

在明确耕地细碎化内涵空间尺度特征的基础上,从资源规模性、空间集聚性和生产便利性3方面构建耕地细碎化空间测度体系,以江苏省为例,综合运用地理空间分析、数理统计分析等方法,开展了省域尺度耕地细碎化多维评价及相应的土地整治协同探讨。研究表明：① 江苏省资源规模属性值总体偏低,呈现苏北-苏中-苏南逐级递减的分异格局;空间集聚属性值总体较高,但区域差异明显,高值区主要集中在徐淮平原及里下河平原地区;利用便利属性值总体呈现与资源规模及集聚状况相反的格局特征,苏南明显高于苏中和苏北地区,两极分化明显,地域差异较大;② 在乡镇尺度对各分维属性进行耦合形成江苏省耕地细碎化指数,省域尺度下该指数呈现从北到南逐渐增加的格局特征,表现为北部的低值聚集区和西南部的高值聚集区;③ 基于区域耕地细碎化不同属性特征的层次组合特点,全省可划分为利用提升区、集约归并区、设施改造区、规模流转区、资源优配区和综合整治区6种类型分区,据此提出不同分区土地整治的主要整治方向及关键问题。

Evaluation of Cultivated Land Fragmentation and Guidance of Land Consolidation at Provincial Level

The macro social security function of cultivated land resources and the livelihood maintenance function of micro farmers determine that the connotation and characteristics of the fragmentation of cultivated land are quite different in different spatial scales. In view of the fact that the connotation of cultivated land fragmentation is single, the spatial index measurement is limited, and few attention has been paid to the regional differences in land consolidation, such as the characteristics and spatial distribution of cultivated land resources. This study takes a case study in Jiangsu Province, and constructs an evaluation system of cultivated land fragmentation from aspects such as resource scale, spatial agglomeration and production convenience which based on the definition of spatial scale characteristics of the connotation of cultivated land fragmentation. The results show that: 1) The value of resource scale is generally low, showing a pattern of gradual decline from north to south in Jiangsu; The value of spatial agglomeration is generally high, but the regional differences are obvious, and the high value areas are mainly distributed in Xuhuai Plain and Lixiahe Plain; The value of convenience property was significantly higher in southern than that in central and northern of Jiangsu Province, and the regional differences are obvious; 2) At the township scale, the fractal dimension of cultivated land was coupled to form the index of cultivated land fragmentation in Jiangsu Province. The index showed a gradually increasing pattern from north to south under the provincial scale, which was characterized by the low value aggregation areas in the north and the high value aggregation areas in the southwest; 3) Combined with the characteristics of different attributes of cultivated land fragmentation, Jiangsu Province has been classified into six categories: the utilization efficiency improvement area, the intensive merging area, the facility reformation area, the scale circulation area, the resource optimization area and the comprehensive consolidation area. The study can provide a useful reference for identifying the problems of regional cultivated land resource, determining the key direction of land consolidation, and making the consolidation plans for the stage.