Study On Plant Composition And Distribution Pattern Of Green Space System In Built-up Area Of Handan City

The study of urban plant composition and distribution pattern is of great significance for the maintenance of urban ecological balance,the protection of biodiversity,the improvement of urban living environment and the promotion of sustainable urban development.According to the actual situation of Handan City,this paper divides the green space type of Handan City into seven green land types: park green space,residential area green space,university green,road green space,riparian green space,affiliated green space and street green space.The characteristics of plant species were studied in terms of source,life style,floristic diversity and diversity of plants in each green land type by census and stratified random sampling survey.At the same time,the distribution pattern and influencing factors of plants in Hanshan District were analyzed.The main conclusions are as follows:(1)A total of 719 species of plants were found,belonging to 436 genera of 134 families,of which 56.19% were herbaceous plants and 67.04% were native species.The most diverse types are in residential areas and park green spaces.The dominant families are obvious,including 14 families such as Asteraceae,Rosaceae,Poaceae,Fabaceae.Among the 22 geographical distribution types,the “northern temperate” and “pan-tropical” distribution areas have the most plant species.(2)The Shannon Wiener index,Pielou species evenness and Simpson’s diversity index of each green land type arbor plant are: 4.314,0.982,0.014;The shrub plants are: 4.382,0.971,0.014;The herbaceous plants are: 4.618,0.899,0.017.(3)Among the 7 types of green land types,the proportion of native plants is absolute,all above 77.83%.Park green space,residential green space,university green space,road green space,riparian green space,affiliated green land and local green plants in the street green space: 158 Species,129 species,106 species,45 species,53 species,55 species,72 species,with the largest park green space;The proportion of native plants is 77.83%,80.63%,81.54%,78.95%,82.81%,85.29%,80.90%,which is the highest in the affiliated greenbelt;herbaceous plants account for 52.63% of the total native species,and the native plants under each greenland type are herbaceous species.most.From the distribution of flora,the “northern temperate” distribution area has the most native species,followed by the “pan-tropical” distribution area.(4)The spatial distribution of plant diversity in the built-up area is not significantly related to house prices,residential area,distance from the city center,and non-permeate surface ratio.The average abundance of wild flowering species increased with the urbanization gradient “edge zone—intermediate transition zone—core zone”,but the wildflower color did not show a certain regularity according to the urbanization gradient.