Studies On Characters Of Plant Communities In The Greenbelt Of Wuhu City Parks

The greenbelt of parks is the main urban green space,and plant communi -ty forms basic unit of the greenbelt.Rational plant community structure is fundamental to stable,countinual and healthy development of greenbelt of parks,and is a guarantee for eco-efficiency in greenbelt of parks.In this paper,45 relative stability communities in the greenbelt of Wuhu city parks were studied,the Species composition and ecological structure of communities were analyzed,and so did the species diversity.And 11tipical communities of which were choosed to have a comprehensive evaluation from the visual quality and ecological benefit.Finally, based on the investigation and the result of comprehensive evaluation and relevant researchs,the discussions were given to ecological optimization and construction of the greenbelt of Wuhu city parks.The specific results are as follows:1.There are 293 vascular plants belonging to 219 genus and 93 families in Wuhu city parks,including 10 species(belonging to 9 genus and 6 families)of Pteridophyte,16 species(belonging to 13 genus and 5 families)of Gymnosperms,226 species(belonging to 167 genus and 74 families)of Dicotyledon,41 species(belonging to 30 genus and 8 families)of Monocotyledon.There are 213 zone indigenous plantsbelonging to Anhui,which is about 72.70 percent in all species of investigative range,indicating there are stong zone characteristics in floristic composition of sample communities in Wuhu city parks.2.There are 6 community types in sample communities of Wuhu city parks,and the zone vegetation types of evengreen-defoliation broadleaf forest is distinct,taking 37.78 percent in all types.3.The structure of plant communities is multiple structure combined with arbor,bush and herbaceou on the whole in communities of Wuhu city parks.The species density of bush is denser than the arbor.In the arbor layer,the plots that defoliation trees is dominant in importance value take 60.00 percent in all communities;In the bush layer,the plots that evengreen trees is dominant in importance value occupy 60.00 percent in all communities.4.There are no regularity in different parks of Wuhu city to Species diversit:The richness index of herbaceous layer in Zheshan is highest,but its Simpson index is lowest;The richness index of herbaceous layer in Tingtang is lowest,but its Simpson index is highest;The studied whole indexs in three layers in Jinghu are all lower,next is Jiuliantang;The studied indexs in shrub layer are all higher in Shenshan and Heshan.In different layers,the characteristics of community diversity could be identified as richness index herbaceous layer＞shrub layer＞arbor layer,and the forest parks with natural forests is obviously higher than artificial parks in richness index;Diversity indexs shrub layer is higher; Pielou index arbor and shrub layers＞herbaceous laye. 5.The result of comprehensive evaluation showed the communities withⅠ-gradelandscape quality taked 18.18 percent in all appraisal communities,at the same time,the multifactorial appraisal of the forest parks with natural forests is better than artificial parks.6.Based on the conception of'environmental protection forest'from Japanese ecologist Akira Miyawak,and combined with experience of simulat -ing zone vegetation's type to build'near-natural'forest by many citys,put forward the approach of ecological optimization in the greenbelt of Wuhu city parks,and discussed further the model of constructing'near-natural' communities in the greenbelt of Wuhu city parks.