The Study On The Relevance Between Urban Green Space Structures Or Landscape Pattern And The Part Of Environmental Factors In Jiangmen City

City green space is an important part of city ecosystem, it can improve the city’s ecological environment, have a positive significance to promote the city nature, economy, social development. Ever green space study in the city of Jiangmen is less, this article as a starting point, from the ecological factors of plant community structure, plant landscape lattice and plant communities correlation of three aspects of the research on it, in order to provide the reference for the urban construction of Jiangmen city.The results of this study are as follows:1. In the research of plant community structure:from the point of view of the number of plant species, a total of Jiangmen City,62families,136genera,237species, number of family is less, but the plant species are more abundant, used in city greening construction is only30%-45%, the number of applications is still relatively small, there are many plant species recorded data last, but it is difficult in the urban planting, Because of the higher demands on the environment of these plants, it is difficult to use.In the19study areas, summed up the widely used species:the tree layer,Ficus. altissima B1., Livistona. cninensis(Jacq.)R.Br., Ficus. benjamina L Ficus. microcarpa L.f, Bischofia.javanica Bl., Mangifera. indica L., Syzygium. cuminii(L.)Skeels, Heteropanan. fragrans (D.Don)Seem.and Chukrasia. tabularis A.Juss etc. The shrub layer is divided into spherical shrubs and hedges or color swatch planted shrub, shrub which ball type most frequently used are:Carmona. microphylla (Lam.)Don, Codiaeum. variegatum^L..)AJuss., Hibiscus, rosa-sinensis L., Pittosporum. tobira Art., Aglaia. odorata Lour., Duranta.erecta L Lagerstroemia. indica L.etc; and the application and hedge or color planting shrubs:Lantana.camara L.,Nerium. oleander L., Schefflera. actinophylla (Endl.) Harms etc.Herb:Zoysia tenuifolia Willd ex Trin.,Zephyranthes candida(Lindl.)Herb., Wedelia trilobata(L.) Hitchc.and Canna indica L.etc.From the diversity, richness in GuiFeng Shan community is the highest, followed by Penglai park and City Plaza, plant diversity. The richness is low, the general trend is hierarchical index of tree layer>shrub layer>herb layer.From the analysis of the structural characteristics of plant communities, the average height and coverage, various types of community ordination are:coastal plant communities’> famous scenic plant communities’>Road plant communities’>Park plant communities’>square plant communities’; the average diameter at breast height, ranking is:coastal plant communities’>famous scenic plant communities’>Road plant community=Park plant communities’> square plant communities’.2. Plant landscape pattern:from the overall situation, the main city of Jiangmen has6kinds of landscape elements, respectively is the evergreen broad-leaved forest, evergreen coniferous forest, evergreen coniferous and broad-leaved mixed forest, sparse forest grassland, orchard, forest and other types of. The evergreen broad-leaved forest in the highest diversity, the most abundant of species, are the main backbone tree species in Jiangmen city.From the whole landscape pattern, evergreen broad-leaved forest is in the form of contiguous patches, and evergreen coniferous forest in strip form, sparse forest grassland is the large plaque form, form different spatial layouts, enriches the entire city space.From the point of view of landscape index, the6index were analyzed in Jiangmen city green landscape from different angles, can see Jiangmen city has some natural advantages, but also can see there are some problems in the overall design: central green area, there are still lack more green area, the construction of higher density., green area reduction; banded green layout to a certain extent the formation of climate, favorable ventilation, to prevent the heat island effect, but it is bad to a certain extent, and animal and plant breeding, not easy to form a good ecological system etc.3. Study on the correlation of ecological factors with plant communities:based on the selected to study the ecological factors, the correlation of ecological factor with road plant communities are most obviously, the second are parks and squares plant community, followed by the plant community are famous scenic areas and coastal areas.From the aspects of the structure of plant community characteristics and ecological factors related to research, concluded that:in the plant community characteristics, total coverage and total dominance, the average density and coverage, the average plant height and total dominance, total coverage is significant positive correlation,PMio and wind speed and relative humidity is show significant negative correlationin. The ecological factors, are positively related to light illumination and temperature, temperature and wind speed were negatively related, wind speed and relative humidity is negatively correlated with relative humidity, light intensity and temperature were negatively related; in the relationship between plant community characteristics and ecological factors, showing a negative correlation between temperature and average plant height, total coverage, between the average total density and wind speed also showed a negative correlation relationship, light intensity and total coverage showed a negative correlation relationship,PMio and total coverage and average total density are negatively related.4.according to the functional areas of different types, from the comparative analysis of eco efficiency indicators of different, draw the following conclusions:(1) in plant diversity and richness, various function to sort:famous scenic spots’ Park’road’Square, opposite and uniformity.(2) in the cooling effect, order:"’Famous Scenic Park Road Plaza, has the very big relations with the plant community in tree layer number, the number of trees had, the cooling effect is more obvious.(3) in, choke effectiveness ranking:Park’famous scenic spots’road’Square, the plant community and density, the number of layer and shrub layer, to a certain extent, reflect the rich Park plant community level, the higher density.(4) in the blocking dust effect, order:"’Famous Scenic Road Park Plaza, and the distances from the pollution sources, plant adsorption capacity and other factors.