区域一体化背景下土地覆盖变化及其对地表热环境的影响

Land Cover Changes and Its Impact on the Surface Thermal Environment under Regional Integration

摘要: 土地利用/土地覆盖(LULC)作为关键环境因素，关系居民生活舒适度与生态可持续发展。区域一体化作为当代城市发展的主要方向，本研究聚焦2000~2023年长株潭城市群一体化进程，采用遥感数据反演技术，通过土地利用动态度、转移矩阵及景观格局指数等方法揭示LULC时空演变规律及其对地表热环境的影响。研究发现区域一体化显著增强城市间空间连通性与集聚效应，三市交界处不透水面持续扩张；发展初期主要表现为生态用地向建设用地和耕地转化，后期大型生态工程促使林地面积回升，形成“缩减–修复”的演变特征。基于XGboost机器学习的方法发现不同土地覆盖类型的景观格局对地表热环境的影响各有差异。研究证实区域协同发展对土地利用格局和地表热环境具有阶段性重塑作用。

Abstract: Land Use/Land Cover (LULC), as a critical environmental factor, is closely related to residents’ living comfort and ecological sustainable development. Regional integration, as a major direction of contemporary urban development, is the focus of this study, which examines the integration process of the Chang-Zhu-Tan urban agglomeration from 2000 to 2023. Using remote sensing data inversion technology, this research employs methods such as land use dynamic degree, transition matrix, and landscape pattern indices to reveal the spatiotemporal evolution of LULC and its impact on the surface thermal environment. The study finds that regional integration significantly enhances spatial connectivity and agglomeration effects between cities, with continuous expansion of impervious surfaces at the junction of the three cities. In the early stages of development, the primary trend was the conversion of ecological land to construction land and cultivated land, while in later stages, large-scale ecological projects led to a recovery of forest area, forming an evolution characteristic of “reduction-restoration.” Based on the XGBoost machine learning method, it was found that the landscape patterns of different land cover types have varying impacts on the surface thermal environment. The research confirms that regional coordinated development has a phased reshaping effect on land use patterns and the surface thermal environment.