Communnity Research Of Tne Mossy Dwarf Forest In Fujian

In this paper,we analyse the community characteristics of five original mossy dwarf forest types in Fujian Wuyishan National Nature Reserve,Fujian Emeifeng National Nature Reserve and Fujian Tianbaoyan National Nature Reserve.The research includes species composition,community physiognomy,areal-type characteristics,community structure,community stability,etc.Their differences with the subtropical evergreen broad-leaved forests are also discussed.The main conclusions are as fellows:(1)In community composition,mossy dwarf forests are mainly dominated by the species of Rhodoraceae,Theaceae,Fagaceae,Rosaceae,Lauraceae,Symplocaceae,Magnoliaceae,Buxaceae,etc.In additions,species of Ericaceae are mostly the major dominant species.There are large differences among those communities in the number of famlies,genera,species composition.(2)Mossy dwarf forests show highly adaptations to cold,foggy,and windy habitat in physiognomy:as for life form,the proportion of nanophanerophyta,hemicryptophyte and therophyta increase for adaption to lower temperature;in leaf-size class,the proportion of middle sized leaf and small sized leaf is also increase;there are also more abundant species with papery leaf and herbaceous leaf.(3)Species diversity index varies from community to community.However,the biodiversity decrease in order of Camellia chekingoleosa community.Rhododendron siniarum community,Rhododendron fortune community.Symplocos paniculala community and Buxus sinica community in totally,and compared to tropical evergreen broad-leaved forest,moosy dwarf forests show lower speices diversity.(4)At the family level,except for Buxus sinica community.mossy dwarf forests in Fujian are mainly composed by Pantropic distribution,which is similar to subtropical evergreen broad-leaved forest.Buxus sinica community is dominated by northern temperate distribution-type;at the generic level,the floristic composition of each community is more complex,the ratio of temperate elements increase significantly.In general,compared to analysis of floristic composition at the family level,the floristic analysis in genus can reflect the community characteristics more accurately.(5)On the community similarity,Jaccard index and Sorensen index show similar results:Rhododendron fortune community and Symplocos paniculate community show the highest level of similarity at species and genus levels;at family level,Camellia chekiangoleosa community and Rhododendron simiarum community have the highest level of community similarity;but in Ochiai index,Buxus sinica community and Symplocos paniculate community show the highest similarity at all the levels.(6)The results of species association and spatial pattern analiysis of dominant species in different communities are as follows:the species association in Camellia chekiangoleosa community and Buxus sinica community is no significantly positive correlation,but Rhododendron fortune community and Symplocos paniculata community shows negative correlation.The results of spatial pattern show that constructive species in tree layer are aggregate distribution,which indicates that the connection of interspecies is tight,but other dominant species varied with species and community.(7)The results of community stability study show that all communities are in a unstable state,the stability rank is Camellia chekiangoleosa community =Rhododendron simiarum community>Rhododendron fortune community>Symplocos paniculata community>Buxus sinica community.And the stability trand of different communities show highly relevance with the trend of community species diversity,thus the higher community species diversity is,the higher community stability it has.