四川省土地整治项目时空分异格局分析

Spatio-temporal variation of land consolidation projects in Sichuan Province

  • 摘要: 从不同空间尺度分析特定时期土地整治项目的分布特征,可为制定下一阶段土地整治规划及优化空间布局提供决策参考。基于2011—2015年土地整治项目数据,以县域为评价单元,采用变异系数法、重心模型法和空间自相关模型法,探讨了四川省土地整治项目在不同空间尺度的分布特征,分析了重心转移和空间格局演变特征。研究表明:①从时间维度看,四川省土地整治项目总量呈下降趋势,项目绝对规模差异、相对规模差异逐步减小,呈现均衡化趋势。②不同空间尺度下土地整治项目具有不同特征。区域层面上,土地整治项目集中分布在盆地丘陵农用地整治区;市域层面上,项目主要集中在成都市和宜宾市,而甘孜藏族自治州、凉山彝族自治州和攀枝花市分布较少。③重心移动轨迹中所有重心点均落在盆地丘陵农用地整治区内,空间分布具有一定的地域均衡性。④土地整治项目在县域尺度分布存在较为显著的集聚性。高-高集聚区主要集中在盆地丘陵农用地整治区的东北部,低-低集聚区主要分布在川西北高山高原生态整治区。由于受项目区社会经济、人口、地形条件和政策的影响,四川省土地整治项目时空格局均衡性有待进一步提高。该研究明确了四川省土地整治规划重心在盆地丘陵农用地整治区,今后土地整治发展方向在于适时适度地开展川西南山地河谷农用地整治区、川西北高山高原生态整治区土地整治,有利于优化四川省土地空间开发利用格局。

     

    Abstract: Land consolidation has developed into a strategic national deployment. Analysis of the distribution characteristics of land consolidation projects can provide a reference for decision-making on developing new plans and optimizing spatial patterns of future land consolidation. Based on 2011-2015 data on county-scale land consolidation projects in Sichuan Province combined with coefficient of variation analysis, gravity center model, and spatial auto-correlation analysis, the paper analyzed spatio-temporal variation of land consolidation in Sichuan Province. The novelty of the study was in the analysis for the balances in land consolidation activities in different periods at different spatial scales. Multi-scale land consolidation has gained considerable attention in recent time. There was a negative trend in total land consolidation projects number in Sichuan Province for the period 2011-2015. By calculating standard deviation and coefficient of variation of land consolidation projects, absolute differences were found among land consolidation projects in each district or county with a general declining trend for 2011-2015. The absolute scale of land consolidation projects in each district or county and the relative difference also declined, which indicated a balanced development trend in the districts or counties. Remarkably different features were noted at different spatial scales. At regional scale, land consolidation projects were concentrated in agricultural land consolidation region in basin hilly area. The realization of the macro-objectives of land consolidation should be based on regional natural conditions. At city-scale, land consolidation projects were mainly concentrated in Chengdu and Yibin Cities, with less distribution in Ganzi Tibetan Autonomous Prefecture, Liangshan Yi Autonomous Prefecture and Panzhihua City. The number of land consolidation projects was positively correlated with population concentration. Gravity centers of land consolidation projects were mostly in agricultural land consolidation region in basin hilly area, with basicaly balanced spatial variation of the projects. The gravity center of land consolidation projects moved eastward compared with the standard gravity center (102°41'29.92"E, 30°37'44.83"N). It was found that the spatial patterns of land consolidation projects had strong spatial autocorrelation. High-high concentration areas were mainly in the northeastern region of the agricultural land consolidation region in basin hilly area. On the contrary, low-low concentration areas were in the ecological rehabilitation region in Northwest Plateau of Sichuan. In general, due to the socio-economic, demographic, terrain and policy conditions of the project area, the spatial and temporal patterns of land consolidation projects needed further improvement. This study explained the focus of land consolidation planning on agricultural land consolidation in hilly areas of Sichuan Province. Timely and appropriate execution of land consolidation projects in agricultural land remediation in mountain valley area of Southwest Sichuan was also explained. Ecological rehabilitation region in Northwest Plateau of Sichuan was the direction of future land consolidation development. It was conducive to optimize landscape development and utilization patterns in Sichuan Province.

     

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