Spatial Pattern And Diversity Analysis Of The Bryophyte At Baotianman,Henan,China

In this paper,we used bryophyte communities of Baotianman National Nature Reserve as the research object,and set up 1 hm2 mosssites in the hinterland of theconservation area.At the same time,we set 400 5×5 m quadrats,and conducted a comprehensive survey of bryophyte species in each quadrat.All the trees in the land were covered with moss were positioned.we analysed the spatial pattern of 11 epiphytic bryophytes species by using univariate of g(r)function,along with homogeneous Poisson model,heterogeneous Poisson model,homogeneous Thomas model and heterogeneous Thomas model,in the 100 m × 100 m plot area of Baotianman Nature Reserve.The effects of habitat heterogeneity and dispersal limitation on spatial distribution patterns of epiphytic bryophytes were discussed preliminarily.Secondly,the nested sampling method and 8 curves was used to analysis the species area relationship of bryophyte communities.And then,the goodness of species area models were tested by Akaike information criterion.The results showed that 1)6 out of 11 species showed aggregation distribution in the homogeneous Poisson model,and the aggregation were decreased under the homogeneous Thomas model.But all of them were randomly distributed in the heterogeneous Poisson model.Compared to the distribution under the homogeneous Poisson model,4 species' aggregation distribution turned into random distribution on the large scale of the heterogeneous Poisson model;And 2 species' aggregation distribution developed into random distribution on a small scale of homogeneous Thomas model.Research suggests that both habitat heterogeneity and dispersal limitation have effects on the spatial distribution pattern of epiphytic bryophytes,and the habitat heterogeneity plays a major role;Habitat heterogeneity can affect the spatial distribution of epiphytic bryophytes on a small scale,and dispersal limitation can also work in a large scale.This study provides a theoretical basis for the study of the distribution and influencing factors of bryophyte species.2)Among the 8 fitting models,all of model(5)(AIC = 52.51),model(7)(AIC = 51.47)and model(8)(AIC =49.22)were fit well.These models are better than the commonly used Weibull model(AIC = 58.25),exponential model(AIC = 89.58),logistic model(AIC = 77.16)and logarithmic model(AIC =75.19).The fitting effect of model(6)(AIC = 127.80)was the worst model.According to the AIC value,the fitting value of the model(8)wasclose to the observed value,and it is he best model to fit bryophyte species' species-area relationship of 1 hm2 plot in Baotianman Nature Reserve.