Spatial distribution pattern and correlation of dominant species of evergreen broad-leaved forest in Shiwandashan mountain
[Objective]Mountainous evergreen broad-leaved forest is the main vegetation type in Shiwandashan.In order to reveal the spatial distribution pattern and correlation characteristics of its community population,and to explore the competitive relationship and maintenance mechanism of community species.[Method]The top 6 species with important value in the sample plot of 1 hm2 mountain evergreen broad-leaved forest in Shiwandashan were taken as the research object.By g(r)function,variance ratio and Spearman rank correlation coefficient were used to analyze the spatial distribution pattern and intra-specific and inter-specific correlation of the population.[Result]When using a complete stochastic model(CSR)to analyze the spatial distribution pattern of dominant species in the sample plot community,it was found that the dominant species were clustered on the scale of 1 to 11 m,while the Clethra delavayi,Schima argentea,and Stewartia villosa were clustered on the scale of 1 to 25 m;When analyzed using a heterogeneous Poisson model(HP),the dominant species were randomly distributed on a scale of 10-25 m;The spatial distribution patterns of the dominant species were all affected by habitat heterogeneity,but the degree of influence was different.Altitude and gradient had a significant impact on the pattern distribution of dominant species in the microtopography factors of the sample plot;The spatial distribution pattern of population at different age levels was affected by individual density,young individuals of the growing population tend to be clustered,and the distribution pattern tended to be random with the increase of age class;The adult individuals of the declining population were clustered on a small scale,and the saplings and small-aged individuals are randomly distributed;There was no intraspecific competition and exclusion relationship,and intraspecific correlation was positive or no correlation,and intraspecific correlation and scale correlation;The community was positively correlated as a whole,and the positive correlation or non-correlation species pairs among species were more than the negative correlation species pairs,indicating that the competitive relationship between dominant species in a community was weak,and mutual independence between dominant species was conducive to species coexistence.[Conclusion]The distribution pattern of dominant species is affected by habitat heterogeneity and density.The distribution pattern changes with spatial scale and development stage;The intraspecific and interspecific relationships are mostly positive or no correlation,the exclusion competition relationship is not significant,and the community population structure is stable.
spatial distribution patterninterspecific associationintraspecific associationmountain evergreen broad-leaved forest
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