摘要:
准确把握新型城市群生态环境质量的演变趋势,识别其影响因素,对科学引导城市化并实现可持续发展具有重大意义。在目前新型城市群生态环境质量时空演变特征评价研究中,缺乏多因素对生态环境质量的交互影响的相关研究,针对此问题,该文基于Google Earth Engine(GEE)平台,以长时序 Landsat TM/OLI遥感影像为基础数据源,采用遥感生态指数(remote sensing ecological index, RSEI),结合Sen斜率估计和Mann-Kendall检验方法,探究1990—2020年长株潭城市群生态环境质量的时空变化特征,并运用地理探测器定量测度不同因素对长株潭城市群生态环境空间异质性的影响。研究表明,长株潭城市群生态环境质量总体较好,空间分布总体上遵循“边缘地区较好,核心区较差”的格局。长株潭城市群生态环境质量等级为“优”和“良”的面积平均占比超过60%。可持续发展理念转变了长株潭城市群城市无序扩张的发展模式,使得RSEI呈现先下降后上升的趋势,并在2000年出现拐点。1990—2020年长株潭城市群中心城区生态环境质量退化严重,非中心城区生态环境质量变化以提升为主。自然地理条件是显著影响长株潭城市群早期生态环境质量的主要因素,但随着社会经济发展,夜间灯光等社会经济因素对生态环境质量影响逐渐增强,并逐步发挥主导性作用; 各因子在交互作用下对生态环境质量的影响显著增强,2010年前人文因素和自然因素间的交互作用对生态环境影响较强,而2015年后人文因素间的交互作用对生态环境质量影响较强。该研究结果可为推进长株潭城市群一体化高质量发展提供科学依据,同时也为其他同类型城市群发展提供参考。
Abstract:
Accurately identifying the evolutionary trend and influencing factors of ecological environment quality in new urban agglomerations holds crucial significance for scientifically guiding urbanization and achieving sustainable development. Existing research on the spatio-temporal evolutionary characteristics of ecological environment quality in new urban agglomerations ignored the interactions of multiple factors on ecological environment quality. Based on the Google Earth Engine (GEE) platform, and long-time-series Landsat TM/OLI remote sensing images as the fundamental data source, this study delved into the spatio-temporal variations of ecological environment quality in the Changsha-Zhuzhou-Xiangtan urban agglomeration from 1990 to 2020 using methods including the remote sensing ecological index (RSEI), Sen’s slope estimator, and Mann-Kendall test. Moreover, the geographical detector was employed to quantitatively measure the effects of various factors on the urban agglomeration’s spatial heterogeneity. The results indicate that the Changsha-Zhuzhou-Xiangtan urban agglomeration exhibited generally high ecological environment quality, with a spatial distribution pattern of higher quality in marginal areas and lower quality in core areas. The average proportion of areas with ecological environment quality graded as “excellent” and “good” exceeds 60% in the urban agglomeration. The sustainable development strategy altered the urban sprawl in this urban agglomeration, leading to a decline followed by an increase in RSEI, with an inflection point in 2000. From 1990 to 2020, the ecological environment quality significantly deteriorated in central urban areas while improvement was observed in non-central urban areas. Physical and geographical conditions significantly influenced the ecological environment quality of the urban agglomeration in the early stages. With socio-economic progression, the influence of socio-economic factors like nighttime lighting on ecological environment quality gradually intensified, assuming a dominant role over time. Besides, the interactions among factors significantly enhanced the effects of individual factors on ecological environment quality. Before 2010, the interactions between human and natural factors exerted considerable influences on the ecological environment. After 2015, the interactions among human factors yielded more pronounced effects on ecological environment quality. These findings serve as a foundational guide for the integrated high-quality development of the Changsha-Zhuzhou-Xiangtan urban agglomeration and a reference for the advancement of other comparable urban agglomerations.
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