| In order to explore the Urban Renments Natural Mountain habitat plant community and its response mechanism to urban spatial morphology and structure in karst mountain cities,the fractal theory,spatial syntactic theory and other research methods were used to systematically study the spatial morphology and structure characteristics of karst mountain cities in order to reveal the spatial morphology characteristics of karst mountain cities.By means of community survey,the diversity characteristics of Renments Natural Mountain plant communities were analyzed.Pearson correlation test was used to analyze the correlation between spatial morphological structure and species diversity of plant communities.The findings are as follows:(1)There are two scale areas in Guiyang city with a boundary of 28 rings,and the power function relation fitting effect in the first scale area is better,which indicates that Guiyang city form has more obvious fractal characteristics,the dimension is 1.655,and the second scale area has no obvious fractal.The city has the characteristics of double core irregular outward divergence distribution,the core area is Guiyang North Station and Guiyang Railway Station area,and the degree of integration of the two is higher than that of other areas.The overall reasonable degree of Guiyang is low,the degree of spatial connection is not high,the better area is Guiyang North Station area,which shows that the urban space of karst mountain has the characteristics of complex and diverse,social space and natural space blending,heterogeneity and so on.There are many Renments Natural Mountain,and the cities and mountains are embedded in each other,thus forming a diverse and complex spatial network of natural and social integration,so its reasonable degree is low.Thedistribution of high-value nuclear density is scattered,and the density of buildings is mainly distributed from the center of each administrative district to the periphery.(2)There are obvious differences in species composition and important values of Urban Renments Natural Mountain in Guiyang.There are 25 different tree communities in 28 plots.The ecological dominance of karst mountain is generally low,lack of obvious dominant species,the number of mountain trees is less,and the difference of species number between different places is large,and there is no obvious rule in the change of community quantity characteristics in different regions.All four indices of species diversity of Renments Natural Mountain plant communities in Guiyang city are on the low side,and the difference of mountain vegetation diversity index is great.There are significant differences in species diversity index of natural mountain plant communities between different regions of Guiyang City.The overall diversity index of Guanshanhu District and Yunyan District is higher than that of other regions,followed by Nanming District,Baiyun District and Wudang District,among which the lowest species diversity index is Huaxi District.In the different directions of mountain body,there are significant differences between the different directions of most mountain bodies,the Renments Natural Mountain within the city is relatively fragile,and the diversity of plant community species is easily affected by external conditions,so the external conditions of different mountain positions are different,and the diversity of plant community species is significantly different.There are significant differences in species diversity of plant communities in different elevations.In the application of urban greening of mountain natural remains,there were significant differences in plant diversity index of different green space types,mainly showing that park green space was higher than regional green space and ancillary green space,in Margalef index and Shannon-Wiener index,park green space was higher than regional green space and ancillary green space,but there was no significant difference in Simpson index.(3)In the built-up area of Guiyang City,there is a significant correlation between the integration degree,the average depth and the mountain plant diversity index in the overall urban spatial morphological structure index,while the selection degree,connectivity and control value have no significant correlation with the mountain plant diversity,and the integration degree has a significant positive correlation with the mountain plant diversity index.Only Huaxi District and Nanming District have a significant relationship between spatial structure and mountain plant diversity.The connectivity index of Huaxi region showed a significant negative correlation with Margalef index and Shannon-Wiener index.In the region with higher integration degree,the plant diversity index was higher,and the selection degree of Nanming region showed a significant negative correlation with the Margalef index.The higher the selection degree,the lower the plant diversity index.However,there was no significant correlation between spatial morphological structure index and plant diversity index in park green space and Simpson diversity index. |
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