Study on the Characteristics of Urban Spatial Evolution and its Influence on Ecological Quality in Dongting Lake Area
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摘要: 保持洞庭湖地区生态健康,对区域可持续发展具有重要意义。然而,伴随着城镇空间的无序扩张,生态安全面临巨大威胁。本文基于扩张速度指数、扩张强度指数与遥感生态指数(RSEI)分析了2010—2020年洞庭湖地区城镇空间和生态环境质量的时空变化,并通过指数回归模型探索城镇空间演化对生态环境质量的影响。结果表明:(1)2010—2020年,洞庭湖地区城镇空间加速扩张,城镇面积增长了232.7km2,集中分布在洞庭湖四周区域,整体呈现多点集聚状态且不断向周边区域拓展。(2)洞庭湖地区生态环境质量总体呈波动状态,表现出改善的趋势;生态环境质量处于中等、一般和较差的区域向周围扩展。(3)研究期间,洞庭湖地区生态环境质量与城镇空间扩张速度、城镇空间扩张强度呈现负相关。以上研究发现可以更好地为城镇发展与生态保护协调优化提供参考,同时为洞庭湖地区及其他湖区的高质量发展与可持续发展提供支持。Abstract: Maintaining ecological health in Dongting Lake area is of great significance to regional sustainable development. However, with the disordered expansion of urban space, ecological security is facing a great threat. Based on the expansion rate index, expansion intensity index and remote sensing ecological index (RSEI), this paper analyzed the spatio-temporal changes of urban space and eco-environmental quality in Dongting Lake area from 2010 to 2020, and explored the impact of urban space evolution on eco-environmental quality through exponential regression model. The results show that:(1) From 2010 to 2020, the urban space in Dongting Lake area has accelerated expansion, with the urban area increasing by 232.7km2, concentrated in the area around Dongting lake, presenting a multi-point agglomeration state and continuously expanding to the surrounding areas. (2) The ecological environment quality in Dongting Lake area fluctuated and showed a trend of improvement. The areas with medium, general and poor ecological environment quality spread to the surrounding areas. (3) During the study period, eco-environmental quality was negatively correlated with urban spatial expansion intensity. The above research findings can provide a better reference for the coordination and optimization of urban development and ecological protection, in order to provide support for the high-quality development and sustainable development of Dongting Lake area and other lake area.
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