Xie Xianjian.Spatiotemporal Characteristics of Urban Construction Land Expansion and Occupation of Arable Land in Sichuan Province[J].Research of Soil and Water Conservation,2024,31(03):342-349.[doi:10.13869/j.cnki.rswc.2024.03.020]
四川省城市建设用地扩张及其占用耕地的时空特征
- Title:
- Spatiotemporal Characteristics of Urban Construction Land Expansion and Occupation of Arable Land in Sichuan Province
- 文章编号:
- 1005-3409(2024)03-0342-08
- Keywords:
- Sichuan Province; expansion of construction land; arable land occupation; RS; GIS; food security
- 分类号:
- TP79
- 文献标志码:
- A
- 摘要:
- [目的]研究四川省城市建设用地扩张及其占用耕地的时空特征,为保护四川省耕地资源的可持续利用,保障区域内粮食安全提供理论依据。[方法]以四川省为研究对象,基于遥感数据和GIS技术,分析了2000—2020年城市建设用地扩张对耕地占用过程的时空变异特征。[结果]20年间四川省城市建设用地持续扩张,增加了3260.56 km2,增长率达到110.34%,其中新增建设用地2 900.34 km2流转于耕地,耕地是四川省城市建设用地扩张的主要来源,建设用地持续扩张不断蚕食城市周边耕地资源,进而有可能威胁到区域的粮食生产安全; 四川省建设用地扩张在空间上具有集中分布的特征,各地市州建设用地扩张空间差异显著,扩张建设用地分布表现为以成都市为中心的高值区,然后向东部城市呈面状逐渐蔓延,而西部城市呈零星点状分布的特点; 四川省建设用地扩张高度依赖对耕地的占用,近年来,虽然四川省积极推行粮食生产结构优化措施,持续实施土地整治、农业结构调整,不断加大对粮食生产的支持力度。[结论]总体上,四川省耕地面积的减少对粮食产量形成的影响程度不大,但建设用地扩张继续占用耕地加大的趋势假如得不到有效遏制,对未来粮食生产安全仍会构成潜在的威胁。
- Abstract:
- [Objective] The aims of this study are to investigate the spatiotemporal characteristics of urban construction land expansion and its occupation of arable land in Sichuan Province, and to provides a theoretical basis for protecting the sustainable use of arable land resources in Sichuan Province and ensuring regional food security. [Methods] Sichuan Province was taken as the research object. The spatiotemporal variation characteristics of urban construction land expansion on arable land occupation process from 2000 to 2020 were analyzed based on remote sensing data and GIS technology. [Results] Over the past 20 years, urban construction land in Sichuan Province had continued to expand, increasing by 3 260.56 km2, with a growth rate of 110.34%. Among them, 2 900.34 km2 of newly added construction land had been transferred to arable land, which was the main source of urban construction land expansion in Sichuan Province. The continuous expansion of construction land continued to occupy the arable land resources around the city, which might threaten the regional food production security. The expansion of construction land in Sichuan Province was characterized by centralized distribution in space. The spatial difference of construction land expansion among cities and prefectures was significant. The distribution of expanded construction land was a high-value area which centered in Chengdu, and then gradually spreaded to the eastern cities in a plane shape, while distribution of the expanded construction land in the western cities was characterized as sparse spots. The expansion of construction land in Sichuan Province was highly dependent on occupying arable land. In recent years, although measures had been actively implemented to optimize the grain production structure, to continue to implement land consolidation, agricultural structure adjustment, and to continuously increase support for grain production in Sichuan Province. [Conclusion] Overall, the decrease in arable land area in Sichuan Province has little impact on the formation of grain production, but if the trend of expanding construction land and occupying more arable land is not effectively curbed, a potential threat will be still posed to future food production security.
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备注/Memo
收稿日期:2023-06-17 修回日期:2023-06-30
资助项目:长江科学院开放研究资助项目(CKWV2017523/KY); 四川省教育厅重点项目(16ZA0312)
第一作者:谢贤健(1978—),男,四川广汉人,博士,教授,主要从事水土保持理论及技术研究。E-mail:249983710@qq.com