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Ecological Quality Assessment of Megacities and Response to Land Use Change: A Case Study of Wuhan
FENG Yan, MA Hao-yan
Journal of Changjiang River Scientific Research Institute ›› 2026, Vol. 43 ›› Issue (3) : 88-97.
PDF(3479 KB)
PDF(3479 KB)
Ecological Quality Assessment of Megacities and Response to Land Use Change: A Case Study of Wuhan
[Objective] This study aims to conduct a scientific and objective dynamic assessment of ecological quality in megacities to monitor the spatiotemporal changes and to analyze the effects of land use transition on ecological quality, thereby providing insights and recommendations for addressing the safety and ecological issues arising from spatial expansion and spatial factor aggregation in megacities. [Methods] We selected the urban area of Wuhan, Hubei Province, which was newly designated as a megacity in 2022, as the research subject. First, we collected Landsat remote sensing images, digital elevation model (DEM), land use data, and other required datasets from reliable online scientific repositories. Subsequently, the remote sensing ecological index (RSEI) method was applied to systematically process and analyze the remote sensing images to extract the spatiotemporal dynamics of urban ecological quality. Second, Moran’s I was used to perform spatial autocorrelation analysis of the RSEI results to quantify the spatial dependence and clustering characteristics of ecological environment changes, enabling the identification of hotspots and coldspots of ecological quality changes. Finally, ecological quality changes were spatially coupled with land use change data using spatial overlay analysis and statistical correlation methods to derive the quantitative relationship between spatiotemporal changes in ecological quality and land use transition processes. [Results] (1) During the study period, Wuhan’s overall ecological quality exhibited a fluctuating upward trend, with the mean value increasing from 0.57 in 2014 to 0.63 in 2023. The improvement was most pronounced from 2014 to 2017, when the mean RSEI rose from 0.57 to 0.64. (2) Moran’s I for Wuhan’s ecological quality was 0.32, and the “high-high” clusters in the local spatial autocorrelation analysis exhibited spatial continuity, indicating that the ecological quality of Wuhan showed a pronounced spatial clustering pattern. (3) Ecological degradation was mainly concentrated on the periphery of the central urban area, indicating that construction expansion in Wuhan contributed to an overall decline in ecological quality. Meanwhile, ecological quality improved along the shorelines at the confluence of the Yangtze River and the Han River and around wetlands such as East Lake and Liangzi Lake, demonstrating the effectiveness of Wuhan’s ecological restoration initiatives. (4) Analysis of ecological quality changes across land use types further showed that disparities within Wuhan’s built environment widened during the study period. Specifically, the gap in ecological quality between construction land and cultivated land increased from 0.34 in 2014 to 0.38 in 2023, suggesting that the ecological cost of converting cultivated land to construction land increased. [Conclusion] (1) Wuhan’s riverbank and wetland restoration activities have a significant positive impact on ecological quality improvement. Therefore, future efforts should continue to promote ecological governance initiatives such as landscape enhancement in urban renewal areas, riverbank protection, and wetland conservation. (2) In subsequent ecological governance, Wuhan should, while following socioeconomic development, consider the spatial agglomeration characteristics of regional ecological quality changes and adopt region-specific measures for hotspots with sharp ecological degradation, such as appropriate artificial restoration and landscape enhancement. (3) From the perspective of ecological quality advancement, Wuhan, as a megacity, should place greater emphasis on intensive urban development by slowing its expansion pace in line with socioeconomic needs and promoting the ecological renewal of existing urban built-up spaces to improve the ecological quality of human settlements. (4) The data indicate a significant ecological quality gap between cultivated land, forest land, and other ecological spaces and construction land. Therefore, Wuhan should strengthen the supervision and protection of cultivated land and forest land during urban construction and development to mitigate substantial ecological losses arising from land transition.
remote sensing ecological index / ecological quality assessment / Wuhan / land use change / megacity
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方运霆, 刘冬伟, 段伊行, 等. 气候变暖对森林生态系统碳汇功能的影响:机制、方法和主要进展[J]. 生态学杂志, 2024, 43(9):2551-2565.
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Forests are important carbon sinks, absorbing about 33% of the carbon dioxide released from fossil fuel combustion each year. Since 1850, global temperature has increased by 1.1 ℃, and in the future, global temperatures are likely to rise to 2.7-4.8 ℃. However, there are controversies over the direction, degree, and mechanisms of the impact of global warming on forest carbon sequestration, which seriously affects the prediction of future global climate change and the policy-making of government carbon emission control. This article summarizes the mechanisms, research methods, and main progresses of the impact of global warming on the carbon sink capacity and processes of forest ecosystems. In addition, we propose future priority research areas.<br><div> <br></div>
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