Analysis of interspecific competition among forest trees based on species genealogy
This study aims to investigate the influence of kinship between competing and target trees on interspecific competition in coniferous-broadleaved mixed forests to provide theoretical support for the scientific management of these forests. We focused on the coniferous-broadleaved mixed forest situated in Tianmu Mountain National Nature Reserve,Zhejiang Province,China,and introduced tree species genealogy into the Hegyi competition index to construct a new index termed the tree species genealogy competition index (G_Hegyi) . We conducted comparative analyses of the correlation between the Hegyi interspecific competition index,the G_Hegyi interspecific competition index and diameter at breast height(DBH),and the correlation between basal area increment and basal area increment rate with the Hegyi interspecific competition index and the G_Hegyi interspecific competition index. We conducted a comparative study to analyze the relationship of the ratio of the Hegyi interspecific competition index ratio to the G_Hegyi interspecific competition index ratio with tree growth. The results demonstrated that both interspecific competition indices and DBH showed highly significant negative correlations,and both exhibiting power function relationships;basal area increment and both interspecific competition indices showed highly significant negative correlations,and both conformed to logarithmic function relationships. The basal area increment rate had significantly positive correlation with both interspecific competition indices and followed power function distributions. The determination coefficients (R2) and the absolute values of correlation coefficients of G_Hegyi interspecific competition index with DBH,R2 and the absolute values of correlation coefficients of basal area increment,and basal area increment rate with G_Hegyi interspecific competition index were higher than those of the Hegyi interspecific competition index. The G_Hegyi interspecific competition index ratio more accurately reflects the relationship between forest growth and interspecific competition than the Hegyi interspecific competition index ratio. The G_Hegyi interspecific competition index demonstrated superiority in analyzing forest interspecific competition and is thus more suitable for application in related studies of tree growth.
tree species genealogyHegyi competition indexG_Hegyi competition indexinterspecific competitionconiferousbroadleaved mixed forests
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