多山城市遗存山体植物多样性斑块效应研究

为探讨城市遗存山体植物多样性的斑块效应，以贵阳市建成区城市遗存山体为研究对象，采用单因素方差分析和最小显著性差异法(LSD),比较不同山体以及坡向、坡位的植物多样性差异，通过Spearman相关分析法，分析城市遗存山体植物多样性指数与城市遗存山体斑块指数之间的关系。结果表明：除地表粗糙度(SR)和分维数(Fd)指数外，23个城市遗存山体的斑块特征指标斑块面积(Pa)、表面积(Sa)、斑块形状指数(PSI)、破碎度(F)、相对高度(Rh)、平均坡度(As)、平面曲率(Hc)和剖面曲率(Pc)等指数差异比较大；不同城市遗存山体的植物群落整体植物、乔木层、灌木层和草本层的多样性指数均有显著差异。植物多样性各指数均与城市遗存山体的斑块特征指数F、Hc、Pc、Hc、Pa和Sa有相关性，与Rh、Fd、SR、PSI和As指数相关性不显著；不同坡位植物多样性各指数与城市遗存山体斑块指数响应强度由高到低顺序为山顶>山脚>山腰。不同坡向的植物多样性指数与城市遗存山体斑块指数响应强度由高到低顺序为西坡>北坡>南坡>东坡。总体而言，城市遗存山体的植物群落物种多样性存在斑块效应，城...

Study on patch effect of plant diversity in urban remnant mountains of multi-mountain city

In order to explore the patch effect of plant diversity in urban remnant mountains (URMs), the URMs in Guiyang city were taken as the research objects, one-way ANOVA and least significant difference method (LSD) were adopted to compare the difference of plant diversity in different URMs and their slope directions and positions. Spearman correlation analysis was used to analyze the patch effect of plant diversity in URMs. The relationship between plant diversity index and patch index was analyzed. The results showed that: except surface roughness (SR) and fractal dimension (Fd), the difference of the remaining patch characteristic indices of patch area (Pa), surface area (Sa), patch shape index (PSI), fragmentation (F), relative height (Rh), average slope (As), horizon curvature (Hc) and profile curvature (Pc) among 23 URMs were larger;The diversity indices of the whole plants, tree layer, shrub layer and herb layer were significantly different in different URMs. All plant diversity indices were correlated with the patch characteristic indices of F, Hc, Pc, Pa and Sa, but not with Rh, Fd, SR, PSI and As; The order from strong to weak of response intensity of plant diversity indices to URMs patch characteristic indices in different slope positions was the mountaintop, foot of mountain and mountainside. The order from strong to weak of response intensity of plant diversity indices to URMs patch indices in different slope directions was western slope, northern slope, southern slope and eastern slope. In general, there is the patch effect of the plant community diversity of URMs, and the patch characteristic indices of F, Hc and Pc of URMs have a significant impact on plant diversity. The results could provide theoretical and scientific basis for the protection of URM habitats and planning and management of urban green space ecosystem in mountainous cities.