Studies On Flora And Geographic Distribution Of Bryophytes In Daishan Island And The Nearby Islands,Zhoushan,Zhejiang

Zhoushan Islands has many islands,Daishan and surrounding islands are important components of the Zhoushan Islands.In 2016-2018,the members of the research team went to the 8 islands of Daishan Island,Xiushan Island,Qushan Island,Xiaochangtu Island,Dachangtu Island,Miaozihu Island,Dongfushan Island and Qingbang Island for collecting bryophyte.and ecological investigation were also made.The systematic observation and identification of 5,550 samples of bryophytes were carried out,and the following results were obtained through data analysis:1.There are 235 species of 86 genera and 43 species of bryophytes in Daishan and surrounding islands,including 29 species,20 genera and 29 species of mosses,and 28 species,66 genera and 206 species of mosses.2.Pottiaceae?Brachytheciaceae?Bryaceae and Hypnaceae are the main dominant families in the region.Bryum?Brachythecium?Hypnum?Fissidens?Barbula are the main genera of the region.In thes eareas,such as Atrichum rhystophyllum(Müll.Hal.)Paris.,rachycystis microphylla(Dozy & Molk.)Lindb.,Eurhynchium hians(Hedw.)Sande Lac.,Herpetineuron toccoae(Sull.& Lesq.)Cardot?Taxiphyllum taxirameum(Mitt)M.Fleisch.Eurhynchium longirameum(Müll.Hal.)Y.F.Wang & R.L.Hu,Hypnum plumaeforme Wilson are the common species.3.The ecological distribution types of bryophytes in this area are native,stone,cement,stone surface,soil,tree,sand,aquatic,other substrates,etc.,which are mainly indigenous,accounting for 54.50% of the collected specimens.Cement is second,accounting for 23.65% and 10.53% of the collected specimens respectively.Other matrices(waste blankets,rot,etc.)have the least birth,accounting for 0.25%,which indicates that the habitat types in this area are relatively rich.4.North Temperate(27.23%)and E.Asia(22.55%)were the areal-types of bryophyte flora,this result were similar to the result about Shengsi Archipelago.5.The distribution of bryophytes in this area is mainly affected by the area,population and vegetation coverage of the island.The relationship between area and number of species is: y=35.05+1.47x(S=30.125,r=0.883);island population and species The relationship is y = 45.201 + 0.0011 x + 3.152x2(S = 28.504,r = 0.9112);the relationship between vegetation coverage and moss species is y =-11.179 + 2.882x-020x2(S = 57.990,r = 0.5497).