Urban Green Space Close-Natural Plant Community In The Optimal Allocation In Shenyang City

Urban green space is an important basic ecological facility, which has the important function to improve the ecological environment and improve the living quality. It determines the ecological function of urban green space in Shenyang city. It has very important theoretical significance and application value to research the close-nature optimal allocation of urban green space in Shenyang.This article based on Shenyang natural plant community of Tianzhu Mountain, half natural plant community of Beiling Park and typical artificial plant communities of Nanhu park in field survey by using the chessboard sampling method.Detailed analysis and research on the species composition,quantity, species diversity and interspecific correlation of the three community. Using SPSS software to cluster analyze in the arbor layer, using SPSS software to analyze interspecific relationship in various levels, Analysis and comparison of the canopy structure of the three communities using the canopy analyzer and the community structure of the three plots.The analysis results show that: Pinus tabuliformis Carr. and Quercus mongolica Fisch is the tree layer of dominant species in Tianzhu Mountain,they also known as constructive species. Euonymus verrucosus Scop. is the main species of shrub layer in Tianzhu Mountain; The herb layer species composition was relatively rich.There are 37 species of herbaceous plants a total in Tianzhu Mountain plant community, and the main species are Phryma leptostachya L., Polygonatum odoratum(Mill.) and Viola acuminata Ledeb. etc.Celtis bungeana Bl. is the tree layer of dominant species, Lonicera maackii(Rupr.) Maxim is the main species of shrub layer, herb layer species have Viola mandshurica W. and Geranium carolinianum in Beiling Park. The tree layer species is Ginkgo biloba L, Pinus tabulaeformis Carr. and Poplus alba L., the main species of shrub layer is Ligustrum obtusifolium Sieb. et Zucc. and Syringa oblata Lindl., herb layer of the main species is Poa annua L and Plantago depressa Willd. in Nanhu Park. Simpson index, Shannon Wiener index and Pielou evenness index of tree layer and shrub layer in Nanhu Park were higher than Tianzhu Mountain and Beiling Park, Simpson index, Shannon Wiener index andPielou evenness index of herb layer were lower than Tianzhu Mountain and Beiling Park;there is positive correlation between the same level of Lonicera maackii(Rupr.)Maxim- Celtis bungeana Bl., Padus racemosa(Lam.) Gilib.- Celtis bungeana Bl.,Lonicera maackii(Rupr.) Maxim, Euonymus altus(Thunb.) Sieb- Celtis bungeana Bl.,and is negatively related to Salix matsudana Koidz.- Ginkgo biloba L.,Pinus tabulaeformis Carr.,Poplus alba L.Robinia pseudoacacia L.,Catalpa ovata G. Don and Armeniaca sibirica(L.) Lam. etc.; Different layers are positively related has Weigela florida cv.Red Prince,Syringa pubescens Turcz. Subsp., Lonicera maackii(Rupr.)Maxim,Amygdalus triloba(Lindl.) Ricker,Forsythia mandshurica Uyeki-Salix matsudana Koidz.etc, the negative correlation has Ginkgo biloba L.-Poa annua L.,Plantago depressa Willd., Viola mandshurica W.,Galinsoga parviflora Cav.etc.Analysis and comparison of canopy structure show that the leaf area index of Tianzhu Mountain plots and Beiling Park is greater than Nanhu Park, and the average leaf angle and transmission coefficient of Tianzhu Mountain plots and Beiling Park is small than Nanhu Park.Through the above analysis, the existing problems of urban green space community in Shenyang city are summarized,such as in urban green space configuration only consider the ornamental while ignoring the adaptability of plants and in the urban green space fragmentation was significantly,and in the configuration of the plant’s level of transition is not obvious, in the urban green space allocation of native plants have not been fully utilized, etc.In the article put forward the close-nature optimal allocation model of urban green space in Shenyang,Including recreational, ornamental type and environmental protection type.Finally, an application example is presented to provide some theoretical basis and practical suggestions for the concrete operation of urban green space construction in Shenyang city.