Flora Analysis Of Bryophytes In Limushan Nature Reserve,Hainan,China

Hainan Island is the only tropical island in China,which is one of the global biodiversity hotspots.The bryophyte biodiversity research focuses on Diaoluoshan,Jianfengling and Bawangling,but it is not complete for the bryophyte flora in Hainan Island.The purpose of this study is to study the bryophyte diversity and flora in Limushan Nature Reserve,Hainan,China.The detailed information of each bryophyte was recorded by collecting moss,bryophytes and keratobryophytes in Limushan Nature Reserve using transect method.The bryophytes were identified by classical taxonomic methods,and the bryophyte list,new record species and threatened species was made to determine the bryophyte diversity and dominant families and genera in Limushan Nature Reserve;The bryophyte distribution type,ecological type and vertical distribution pattern in Limushan,and the relationship with its adjacent flora,Diaoluoshan,Jianfengling and Bawangling were determined.The results show that:1.There are 286 species of bryophytes belonging to 129 genera and 64 families,9dominant families(? 10 species,including liverworts 4 families and bryophytes 5 families)including 51 dominant genera and 144 species,occupied 39.53% of total genera and50.35% of total species.There are 14 dominant genera(? 5 species,including liverworts 9genera and bryophytes 5 genera),including 113 species,occupied 39.51% of total species,1 new record genus and 19 new record species in Hainan Island,2 extremely dangerous species and 1 vulnerable species in 9 transects collected from the Limushan Nature Reserve;2.There are 13 areal types in Limushan Nature Reserve,Among them,tropical Asia is the most abundant,with 95 species(34.67%),followed by East Asia,which accounts for56 species(20.44%);3.Ecological types of liverworts in Mt.Limu: tree(44.60%)> soil(33.09%)> dry stone(28.78%)> wet stone(23.74%)> leaf epiphyte(20.86%)> sapwood(19.42%);the highest proportion of woody types in liverworts was 30.22%,the highest proportion of woody and stony was 15.11%;Ecological types of mosses in Limushan: soil(47.95%)>dry stone(34.25%)> wet stone(33.56%)> tree(31.51%)> sapwood(10.96%)> leaf epiphyte(2.05%);the highest proportion of lithophytic types in mosses specific habitat is43.84%,the highest proportion of woody and stony was 17.81%.4.With the increase of altitude in Limushan,the number of family and genera and unique bryophyte diversity of each altitude in Limushan showed a trend of increasing first,then decreasing and then increasing,and reached the peak in the middle altitude stage;5.Compared with the liverworts in Diaoluoshan,Bawangling and Jianfengling Nature Reserves,The coefficient of species similarity is the highest in Limushan and diaoluoshan(46.06%,81.04%),the four mountains are dominated by tropical Asia gowth type,followed by East Asia growth type.The speciation of bryophyte diversity in Limushan is mainly caused by unique climatic conditions,complex topography,diverse ecological types,and high altitude tropical mountain cloud forest.