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基于Landsat TM/OLI影像的哈尔滨市植被覆盖度与景观格局动态变化分析

Analysis of Dynamic Changes of Vegetation Coverage and Landscape Pattern in Harbin Based on Landsat TM/OLI Images

  • 摘要: 以哈尔滨市为研究对象,依据2004、2010、2015、2020年Landsat TM/OLI遥感影像,利用归一化植被指数和像元二分模型方法提取该区域的植被覆盖度,结合植被覆盖度转移矩阵,分析植被覆盖度的时空动态变化。根据植被覆盖度分级结果,利用Fragstats4.2软件计算斑块面积、斑块个数、蔓延度与香农多样性指数4个景观格局指数,研究哈尔滨市景观格局的时空演变特征。结果表明,哈尔滨市2004—2020年高植被覆盖度和中高植被覆盖度的区域面积累计和分别占总面积的77.81%、72.54%、73.01%、83.31%,整体处于上升趋势。2004—2020年高植被覆盖度区域的景观百分比占据主导地位,其次是中高植被覆盖度区域,且大部分植被覆盖度区域斑块数量先增加后减少。从景观层次上,斑块聚合度降低、多样性略增加。探究哈尔滨市植被覆盖度和景观格局的动态变化,对城市规划设计和景观格局优化具有一定的指导和参考意义。

     

    Abstract: Taking Harbin city as the research object, the paper extracted the vegetation cover based on Landsat TM/OLI remote sensing images in 2004, 2010, 2015 and 2020, which combined the normalized vegetation index and dimidiate pixel model. Then, we integrated the transfer matrix to analyze the spatial and temporal dynamic changes of vegetation coverage. Based on the results of vegetation coverage classification, four landscape pattern indices namely patch area, number of patches, contagion index, and Shannon’s diversity index, were calculated by Fragstats4.2 software to study the spatial and temporal evolution characteristics of the landscape pattern in Harbin. The results showed that the sum of areas with high vegetation coverage and medium-high vegetation cover accounted for 77.81%, 72.54%, 73.01% and 83.31% of the total area in 2004—2020, respectively, and the vegetation coverage exhibited an overall increasing trend in Harbin City. The landscape percentage of high vegetation coverage was the highest from 2004 to 2020, followed by medium-high vegetation coverage, and the number of patches exhibited a first increasing and then decreasing trend for the most vegetation coverage region. At the landscape level, the aggregation of patches decreased and the landscape diversity increased slightly. This study explores the dynamic changes of vegetation coverage and landscape patterns in Harbin city, which can provide guidance and reference for the planning design and landscape pattern optimization of the city.

     

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