Study On Bryophyte Biomass Of Sygera Mountain In Southeast Tibet

Bryophyte is not only characterized by its rich species diversity,but also abundant biomass.Tibet is located in the "the Earth’s third pole",with unique natural conditions and rich natural resources.Sygera Mountain in southeast of Tibet is located in the transition zone between the sub-alpine cold temperate semi-humid zone and the humid zone,and under the influence of the Indian Ocean monsoon,rich plant resources have been created,which provides an excellent habitat for the growth of various bryophytes.Currently,there is very little research on bryophyte biomass,however,the research on bryophyte biomass is the basis of ecological research.To figure out the role of bryophyte in the ecosystem,the bryophyte biomass in the ecosystem should be first understood.Therefore,the species diversity of bryophytes in 14 sample plots in the east and west slopes of Sygera Mountain was comprehensively investigated,and a total of 589 specimens of epiphytic,terrestrial and saprophytic bryophytes in the east and west slopes were obtained.The specimens were identified by classical plant taxonomy,according to the results,there were 113 species of bryophytes belonging to 66 genera,26 families,and 105 species of mosses belonging to 61 genera,22 families;There are 8 species of liverworts,belonging to 4 families and 5 genera,among which there are 8 dominant families and 6 dominant genera;there are 5 single-species families,accounting for 19.23%of the total families.there are 42 single-species genera,accounting for 63.64%of the total genera.The geographical flora composition of this region has the characteristics of East Asia and has a significant temperate nature,while the evolution of historical environment and geological characteristics of this area changing stably,reflecting the healthy and stable natural ecological environment of Sygera Mountain.At the same time,although the geological environment in this area is very stable,its single-species families and genus occupy a certain share,which also indicates that there are some ancient bryophyte groups in this area,but also closely related to the local complex and changeable micro-habitats.According to the statistical analysis of the total reserves of bryophyte biomass in the eastern slope of Sygera Mountain,The biomass reserves of bryophytes with different substrates in the same slope direction of Sejila Mountain are different.The average biomass of terrestrial,saprophytic and epiphytic bryophytes in Dongpo sample plot is 520.17 g/m2,192.83 g/m2 and 36.75 g/m2.However,the west slope plots are 621.86 g/m2,176.74 g/m2 and 53.86 g/m2 respectively.The characteristics of bryophyte biomass reserves in different substrates are terrestrial>saprophytic>epiphytic.The trend of bryophyte biomass on the east slope along different altitudes is first decreasing,then increasing and then decreasing,while on the west slope is the dynamic trend of first increasing and then decreasing.The biomass of bryophytes is closely related to local environmental conditions,and the biomass is not affected by a single factor,but by many factors.The statistical techniques employed for analysis are one-way ANOVA of SPSS 26.0,or Kruskal-Wallis H of SPSS 26.0.It is found through the study on the influence of influencing factors on the biomass of bryophytes in different substrates in Sygera Mountain that:(1)The pH value of bark have certain influence on the biomass of epiphytic bryophytes,and when the pH value of bark is higher,the growth of epiphytic bryophytes is better and the biomass is greatly increased.(2)The different trunk heights can affect the biomass of bryophytes,with the biomass at the base near the ground being the largest,showing a decreasing trend from the base up.(3)Habitat location can affect the biomass of terrestrial bryophytes to a certain extent,but the biomass is also closely related to local climate,environment and species status.In this paper,the biomass research on the bryophytes of Sygera Mountain in the southeast of Tibet is carried out,which helps fill in the gaps in a comprehensive way,enriches the research contents of the bryophytes,and is of great reference significance for further research in this area.