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2000—2023年安庆市景观格局时空演变特征研究

Study on the Spatiotemporal Evolution Characteristics of Landscape Pattern in Anqing City from 2000 to 2023

  • 摘要: 基于安庆市2000年、2005年、2010年、2015年、2020年、2023年6期安庆市土地利用数据,通过计算土地利用转移矩阵,揭示2000—2023年各景观类型的转化方向、面积与强度;构建景观重心转移模型,以刻画其空间演变轨迹并探明驱动机制;并在斑块类型与景观水平上选取多个格局指数进行量化分析,旨在从空间构型上阐明景观破碎化、复杂化和分散化的演变特征。结果表明:2000—2023年安庆市土地景观类型主要为乔木林和耕地,耕地面积略有下降趋势,建设用地面积上升307.12 km2,草地、水域以及裸地面积呈下降趋势。建设用地面积的增加和耕地、水域、裸地等景观面积的减少,存在不同程度的转入转出。从斑块类型水平上看,2000年耕地斑块类型面积最多,乔木林次之,但随着人为干扰,乔木林和耕地优势度有下降趋势,各景观类型破碎化程度加剧。从景观水平上看,香农多样性指数和香农均匀度指数逐年增加,蔓延度指数持续减少后略有回升。安庆市呈现出耕地、乔木林、草地等景观朝着破碎化和复杂化的方向发展,建设用地集中连片发展的分布格局。

     

    Abstract: Based on land use data from Anqing City in 2000, 2005, 2010, 2015, 2020, and 2023. this study calculated the land use transition matrix to reveal the conversion direction, area, and intensity of various landscape types from 2000 to 2023. A landscape gravity center transfer model was constructed to depict the spatial evolution trajectory and explore the driving mechanisms. Multiple landscape pattern indices were selected at both the patch type and landscape levels for quantitative analysis, aiming to elucidate the evolutionary characteristics of landscape fragmentation, complexity, and dispersion from a spatial configuration perspective. The results showed that from 2000 to 2023, the main landscape types in Anqing City were arbor forests and cultivated land. However. The area of cultivated land showed a slight downward trend, while the area of construction land increased by 307.12 km2. The area of grassland, water bodies, and bare land showed a downward trend. The increase in construction land area and the decrease in cultivated land, water bodies, and bare land areas involved different degrees of land use conversion. At the patch type level, cultivated land had the largest area in 2000, followed by arbor forests. However, due to human interference, the dominance of arbor forests and cultivated land showed a downward trend, and the degree of fragmentation of various landscape types intensified. At the landscape level, the Shannon's diversity index and Shannon's evenness index increased annually, while the contagion index decreased continuously before a slight recovery. Anqing City exhibited a development pattern where landscapes such as cultivated land, arbor forests, and grassland became more fragmented and complex, while the construction land showed a clustered and contiguous distribution pattern.

     

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