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| 合肥市蓝绿空间对地表温度非线性影响效应研究 |
| Nonlinear Impacts of Blue-Green Infrastructure on Land Surface Temperature in Hefei |
| 投稿时间：2025-07-02 修订日期：2025-11-08 |
| DOI： |
| 中文关键词: 蓝绿空间 地表温度 XGBoost模型 非线性效应 |
| 英文关键词: Blue-green space Land surface temperature XGBoost model Non-linear effect |
| 基金项目:安徽省自然科学基金项目（2008085QE241）；安徽省住房城乡建设科学技术计划项目（2023-YF003） |
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| 中文摘要: |
| 城市蓝绿空间是缓解热岛效应的关键空间要素，探析其对地表温度的作用效应，对于科学指导城市热环境调控，提升人居环境舒适度至关重要。以合肥市主城区为研究区域，基于遥感反演地表温度，选取5个景观指数分析蓝绿空间格局，并采用XGBoost模型解析其与地表温度的非线性关系, 结果表明：（1）地表温度呈现“东高西低，南高北低”的空间分异特征。建成密集区高温和次高温集聚，形成城市热岛；绿地与水体等生态区呈中低温斑块分布，共同构成“热岛主导、冷源孤立”的失衡格局；（2）蓝绿空间格局表现为“西部集聚连通-东部破碎离散”的二元特征，西部生态集聚区的绿地与水体集中连片、连通性强，成为城市冷源核心；东部高强度建设区的绿地与水体因开发侵蚀，呈现碎片化分布且连通性差；（3）蓝绿空间对地表温度呈现非线性梯度响应与临界阈值效应，绿色空间以规模优先，形状辅助调控地表温度，蓝色空间则遵循形态主导，规模协同的影响机制。 |
| 英文摘要: |
| Urban blue-green spaces are critical spatial elements for mitigating the urban heat island effect. Investigating their impact on land surface temperature (LST) is essential to scientifically guide urban thermal environment regulation and enhance human settlement comfort. Taking the main urban area of Hefei as the study area, this study analyzes the blue-green space pattern by selecting five landscape metrics based on the remote sensing inversion of land surface temperature. Additionally, the XGBoost model is adopted to explore the nonlinear relationships between the blue-green space pattern and land surface temperature. The results demonstrate that: (1) LST exhibits a spatial differentiation pattern of "higher in the east and south, lower in the west and north," where densely built-up areas aggregate high- and sub-high-temperature zones forming urban heat islands, while ecological areas (green spaces and water bodies) display mid-to-low temperature patches, collectively constituting an unbalanced pattern characterized by "dominant heat islands with isolated cool sources"; (2) The blue-green spatial configuration shows a dualistic characteristic of "highly aggregated and interconnected in the west versus fragmented and discrete in the east"—the western ecological agglomeration zone features concentrated, contiguous green-blue spaces with high connectivity acting as the urban cooling core, whereas the eastern high-intensity development zone suffers fragmented green-blue distributions with poor connectivity due to construction encroachment; (3) Blue-green spaces exhibit a nonlinear gradient response and a critical threshold effect on land surface temperature (LST). Green spaces regulate LST with scale priority and shape-assisted regulation, while blue spaces follow an influence mechanism characterized by morphology-dominated and scale-coordinated effects. |
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