Huang Zhuo-Nan, Chen Ying-Biao, Wu Zhi-Feng
School of Geographical Science and Remote Sensing, Guangzhou University, Guangzhou 510006, China.
Guangdong Provincial Geographical Condition Monitoring and Comprehensive Analysis Engineering Techno-logy Research Center, Guangzhou 510006, China.
Ying Yong Sheng Tai Xue Bao. 2022 Jul;33(7):1993-2000. doi: 10.13287/j.1001-9332.202207.025.
The Pearl River Delta Urban Agglomeration (PRDUA) is a highly urbanized region in China. The urbanized climate, especially the heat island effect, has a significant impact on urban ecosystems and habitats. Based on MODIS land surface temperature (LST) data and land cover data in 2000, 2005, 2010, 2015, and 2019, we quantified the land surface thermal environment and ecosystem service value (ESV), analyzed the decoupling between LST and ESV in the PRDUA from 2000 to 2019 using the decoupling analysis model, revealed the trade-off between them, and analyzed the spatiotemporal variation of the synergistic state between LST and ESV in PRDUA. The results showed that, from 2000 to 2019, the spatial pattern of land surface thermal environment in the PRDUA was relatively stable in time series but showed spatial variation with high fluctuation in the core area and low fluctuation in the peripheral area. The ESV of the PRDUA showed a trend of stable spatial distribution and decreasing in time series. The ESV of all the nine cities in PRDUA decreased by more than 9%. The decoupling between land surface thermal environment and the overall ESV of the PRDUA, as well as with the values of provisioning, regulating and support services, was dominated by weak negative decoupling and strong negative decoupling, showing a more significant trade-off, which indicated that the ecosystems of the PRDUA were still significantly influenced by the environmental characteristics of urbanization, and that the spatiotemporal variation of the decoupling states was related to the spatial variation of urbanization levels in PRDUA. The formulation of future ecological policies in the PRDUA must consider the differences in urbanization levels and the differences in the trade-offs between urbanized environments and ecosystems to precisely formulate ecological control and restoration plans and improve the efficiency and implementation effects of ecological planning.
珠江三角洲城市群是中国城市化程度很高的地区。城市化气候，尤其是热岛效应，对城市生态系统和栖息地有重大影响。基于2000年、2005年、2010年、2015年和2019年的中分辨率成像光谱仪（MODIS）陆地表面温度（LST）数据和土地覆盖数据，我们对陆地表面热环境和生态系统服务价值（ESV）进行了量化，使用脱钩分析模型分析了2000年至2019年珠江三角洲城市群陆地表面温度与生态系统服务价值之间的脱钩情况，揭示了它们之间的权衡关系，并分析了珠江三角洲城市群陆地表面温度与生态系统服务价值协同状态的时空变化。结果表明，2000年至2019年，珠江三角洲城市群陆地表面热环境的空间格局在时间序列上相对稳定，但存在空间差异，核心区域波动大，周边区域波动小。珠江三角洲城市群的生态系统服务价值呈现出空间分布稳定、时间序列上下降的趋势。珠江三角洲城市群所有九个城市的生态系统服务价值下降幅度均超过9%。珠江三角洲城市群陆地表面热环境与总体生态系统服务价值之间以及与供给、调节和支持服务价值之间的脱钩，以弱负脱钩和强负脱钩为主，呈现出更显著的权衡关系。这表明珠江三角洲城市群的生态系统仍受城市化环境特征的显著影响，脱钩状态的时空变化与珠江三角洲城市群城市化水平的空间差异有关。珠江三角洲城市群未来生态政策的制定必须考虑城市化水平的差异以及城市化环境与生态系统之间权衡关系的差异，以精准制定生态控制和恢复计划，提高生态规划的效率和实施效果。
