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基于识别-筛选-置换逻辑的赣东南耕园错配区布局优化

Optimizing the layout in farmland orchard mismatch areas in Southeast Jiangxi using identification-screening-replacement logics

  • 摘要: 因地制宜地解决农业生产空间错配问题,合理优化耕地空间布局,对于提升耕地质量、保障粮食安全和推进农业高质量发展具有重要意义。该研究以赣东南耕园错配区为例,针对存在的耕园错位问题,将可恢复园地纳入布局优化置换对象,构建基于识别-筛选-置换逻辑的耕园布局优化框架,并综合运用博弈论组合赋权法、GIS空间分析、景观格局指数等方法,实现耕园错配区布局优化。结果表明:1)研究区特征劣势地块总面积3332.33 hm2,Ⅰ等地较少,耕地中Ⅲ等地占比最高,占33.99%,可恢复园地中Ⅳ等地占比最高,为25.89%;布局优化后研究区耕地Ⅰ、Ⅱ、Ⅲ等地面积均增加,Ⅳ、Ⅴ、Ⅵ等地面积均减少,耕地平均等别提升了0.63,耕地整体质量水平提高;2)研究划定耕地初步调出区6253.04 hm2、整治区2914.30 hm2,最终调出区3338.74 hm2。根据面积平衡原则,从3511.37 hm2宜耕区中划定置换区3341.38 hm2;3)布局优化后研究区耕地景观格局特征得到改善,同时,6°以上坡耕地数量减少,6°以上园地面积增加;4)建议具体的耕园地布局优化工作应结合现实,依据各研究分区的特点及发展需要,进一步制定不同的工作规划。研究结果可为加强耕地保护、保障粮食安全和推进高质量发展提供科学依据。

     

    Abstract: Spatial mismatch has posed a serious threat on the agricultural production. The spatial layout of the farmland can be expected to rationally optimize, according to the local conditions. The high quality of farmland can also be obtained for the food security in the sustainable agriculture. However, only a few studies have been focused on the optimization of the spatial layout in the farmland-orchard mismatch areas. It is still lacking on the landscape pattern of the farmland at the time of the replacement. This study aims to implement the quantitative analysis of the landscape pattern before and after optimization. A case study was also taken from the farmland-orchard mismatch area in Southeast of Jiangxi province, China. The recoverable orchard was incorporated into the object of the layout optimization and replacement. The current problem of farmland-orchard mismatch was solved to optimize the layout, according to the logic of the identification-screening-replacement. A framework was then constructed in the farmland-orchard areas. The game theory combination empowerment, GIS spatial analysis and the landscape pattern index were finally utilized to optimize the layout of the farmland-orchard mismatch area. The results show that: 1) The total area of characteristically disadvantaged land in the study area was 3332.33 hm2, with the fewer Ⅰ class land. Among them, the highest proportion of Ⅲ class land in farmland was 33.99%, while the highest proportion of Ⅳ class land in the recoverable orchard was 25.89%; There was the great increase in the areas of Ⅰ, Ⅱ and Ⅲ class farmland after the layout optimization. While there was the decrease in the areas of Ⅳ, Ⅴ, and Ⅵ class farmland. The average class of farmland was improved by 0.63, indicating the high quality level of farmland; 2) The study areas were delineated by the preliminary transfer area of 6253.04 hm2 of farmland, the remediation area of 2914.30 hm2, and the final transfer area of 3338.74 hm2. According to the area balance, 3,341.38 hm2 of the replacement area was designated from 3,511.37 hm2 of farmland; 3) The farmland landscape pattern was improved after the optimization. There was the great increase in the degree of farmland contiguity, regularity and aggregation, whereas, the degree of finesse was reduced. The farming conditions were also promoted for the economic benefits. At the same time, the number of the sloping farmland above 6° was reduced, whereas, there was the increase in the area of orchard above 6°. The water retention capacity of the farmland was improved to fully utilize the soil/water conservation and erosion control of the fruit tree, indicating the high ecological benefits. 4) The spatial layout of the farmland-orchard mismatch area should be optimized with the local conditions and decision making on the development needs of each subregion. The finding can provide a strong reference to protect the regional farmland, food security and high-quality development. A typical sample can be obtained for the layout optimization of farmland-orchard mismatch areas.

     

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