Research On Plant Communities Category And The Optimized Transform Of Linpan In Chengdu Plain

As the important part of Linpan green space,plant communities play an important role of ecological environment inmaintenance,building feature sight of Linpan and incarnating special culture value. In this paper,on the basis of Linpan investigation of Chengdu area, we did the research on eighteen Linpan representatives of first and second ring about the types and characteristics of plant communities,and established the classification system of paint communities in Linpan green space.On the basis of comprehensive research on green space of Linpan,optimized transform were done on it.Some useful results are given as the follows:(1)The Whole city have 141, 100 Linpans in 9482 square kilometers,Linpan total area has 67679.87 hectares.Linpan could be divided into three circle levels according to the circle level development characteristic of Chengdu,and on the basis of terrain landform distribution,and it is easy to discover that the quantity of Linpan in dam area and river area are more than cerro area.(2) After 243 green communities have been investigated in 18 Linpan green spaces,four vegetation type groups,eleven vegetation types and ninety-five main plant formations are classified according to the vegetation classification system of "Chinese vegetation":vegetation type group,vegetation type,vegetation subtype,plant formation,plant association.Evergreen broad-leaved forest and bamboo forest are the main types of vegetation in Linpan,the percentage of communities is 25% and 32%.Secondly,evergreen and deciduous broad-leaved forest and needle-leaved forest are 11% and 8%.The plant community types in one and two layer Linpan are more abundant than those in three layer Linpan.This investigation reveals that the structure of plant communities can be classified into two types:monolayer-community pattern and multilayer-community pattern.The percentage of communities with tree-herb structure is 38%,and the percentages of communities with tree-shrub-herb layer and communities with tree-shrub layer are 21% and 20%.Shrub-herb structure and monolayer-community pattern are lower.The results show that tree-herb structure is the main component of plant communities in Linpan.In this plant community survey 153 plant species are conducted, there are75 trees,31 shrubs,31 herbaceous species and ferns, 12 bamboos.The tree layer has the highest average species richness.which is 13.21.The shrub layer and the herb layer species richness is 3.14 and 6.60.And evergreen broad-leaved forest has the highest species richness of tree layer,which is 21.04.the lowest is deciduous needle-leaved. (3)In view of Linpan plant community characteristics,and the some correlative research about the city plant community of green space,proposes optimizing and reconstructing strategy of Linpan plant community are proposed.At the same time,initial researche has been carried out about three kinds of Linpan protection type—ecotype,the special industry and the touring linpan's plant community construction.