Species Composition and Population Structure Dynamics of Sinomanglietia glauca Community
Sinomanglietia glauca is a rare and endangered plant endemic to our country.It is a typical extremely small population plant.In order to clarify the survival status and endangered mechanism of this population and formulate effective conservation strategies,based on the data of 1 hm2 Sinomanglietia glauca continuous plots,a static life table was compiled with population size class structure instead of age structure,and a time series prediction model was established for survival analysis,the population characteristics and dynamics of Sinomanglietia glauca were studied.133 species of vascular plants belonging to 48 families,82 genera were found in Sinomanglietia glauca community.Phyllostachys edulis was the dominant species with an importance value of 48.7,followed by Sinomanglietia glauca with an importance value of 5.86.Only Sinomanglietia glauca and Dalbergia hupeana were the deciduous tree species in the top 10 tree layer important values.The secondary character of Sinomanglietia glauca community was obvious,and its population mainly distributed in the mixed forest of bamboo and broad-leaved.Sinomanglietia glauca population had a pyramid-shaped age structure,characterized by having many seedlings and the number of individuals decreasing significantly with the increase of diameter class.Time series prediction analysis showed that the number of large diameter individuals increased after the population experienced 2,4,6 and 8 age classes.The survival analysis showed that survival rate of the population was low and the cumulative mortality rate was high in early stage,but the mortality rate decreased sharply from the IV age group to the V age group,and the population declined in theⅧ age group.The population of Sinomanglietia glauca decreased sharply in the early stage and declined in the later stage,which made the population increase and population diffusion hindered and formed the extremely small population.In the in situ protection of Sinomanglietia glauca,it is necessary to thin the associated tree species appropriately,reduce canopy density and adjust interspecific relationship,so as to promote benign regeneration of different age classes.
Sinomanglietia glaucaextremely small populationplantpopulation structuretime series predictionsurvival analysis
万方数据
维普
