城市基质对城市遗存自然山体植物群落物种多样性的影响——以贵阳为例
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贵州大学林学院

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国家自然科学基金项目(32060367);贵州省科学技术基金重点项目(黔科合基础[2020]1Z011);贵州省科技支撑项目(黔科合支撑[2021]一般458)


Explore the relationship between the plant diversity of the urban remnant mountains and its surrounding urban matrix characteristics——A case study of Guiyang
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College of Forestry, Guizhou University

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    摘要:

    多山地区城市扩展过程中,建成区内遗存有大量自然山体,形成城市人工基质“海”中的遗存山体“岛屿生境”,这些城市遗存山体长期受到来自城市人工环境的各种间接或直接的干扰。为探索城市基质与城市遗存自然山体植物群落多样性之间的关系,本研究以黔中地区典型的喀斯特多山城市为研究区域,按不同规模选择15座城市遗存山体,每座样山按坡向+坡位组合方式设置群落调查样地,共设置143个样地;以样山边界为基准,100m为步长向外设置20个缓冲区,总宽度为2000 m,计算缓冲区总不透水表面积(PTIA)、植被覆盖度(VC)、破碎化指数(FI)、土地利用(LU)4个城市基质特征指标。运用Pearson相关分析和线性回归模型分析了城市基质特征指标与城市遗存山体植物群落物种多样性之间的相关关系。结果表明:①PTIA对不同规模城市遗存山体整体植物多样性的影响都存在明显空间尺度效应,在2000 m时相关性最高,呈显著正相关;不同规模城市遗存山体整体植物多样性与单个或多个LU类型存在显著相关性,但影响效应存在显著差异;VC、FI与城市遗存山体整体植物多样性无显著相关关系;②不同规模城市遗存山体各层次植物多样性与城市基质特征 4个指标在不同的空间尺度上均存在显著相关性;③城市遗存山体植物多样性Shannon-Wiener指数(H")与每个城市基质特征指标一元线性回归拟合度高,而多元回归R2为0。本研究初步探明城市基质特征对城市遗存山体植物多样性具有一定的影响,但影响规律不一致且存在空间尺度差异,说明城市人工环境对城市遗存山体植物多样性维持的影响非常复杂,需要从不同的角度开展深入的研究,才有可能示城市遗存山体植物多样性的城市化响应机制,进而指导城市遗存山体保护规划与管理。

    Abstract:

    In order to explore the factors influencing the species diversity of plant communities in urban mountain remains, 25 sample mountains were selected based on patch area and kernel density in the urban built-up area of Guiyang, a typical karst mountain city in central Guizhou. On the scale of 20 buffer zones (increments of 100 m, 2000 m in total), four indices of urban matrix, including total impervious surface area, vegetation coverage, fragmentation index and land use, were calculated. The effects of urban matrix characteristics on the species diversity of plant communities in urban mountain remains and their mechanisms were analyzed. The results showed that :(1) The patch area was one of the factors affecting the species diversity of the plant community in the mountain remains. The overall pattern was large for medium > and small BBB>but the effect was low; (2) impervious surface area, vegetation coverage, fragmentation index and land use are the important indicators to explain the impact of urbanization on the species diversity of plant communities in the remaining mountain; (3) of impervious surface area, vegetation coverage, fragmentation index of three indicators of the influence of the remaining mountain plant community species diversity are obvious spatial scale (2000 m), but different area, the density of nuclear remains mountain plant community species diversity of each driver response range and spatial scale effect, no consistent regularity; (4) There is no obvious linear relationship between the formation time of impervious surface of urban matrix and the diversity index of residual mountain. Due to the frequent disturbance of urbanization and multiple human activities, the factors affecting the species diversity of the mountain plant communities in the karst mountain cities are very complex and diverse. The species composition and diversity characteristics of the plant communities are the result of the comprehensive action of multiple factors and multi-scales.

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汤娜,王志泰,包玉,陈信同,马星宇,韦光富.城市基质对城市遗存自然山体植物群落物种多样性的影响——以贵阳为例.生态学报,,(). http://dx. doi. org/10.5846/stxb202101070069

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