Effects of Neighborhood Structure on Radial Growth of Larix olgensis and Quercus mongolica with Different Diameter Classes
Clarifying the relationship between the radial growth and neighborhood structure of trees is helpful to understand the subtleties of stand structure and to make forest management more quantitative and precise.The Larix olgensis and Quercus mongolica forests in Xiaobeihu Nature Reserve were taken as materials,and the radial growth and neighborhood structural parameters of different diameter classes of dominant and associated tree species were calculated respectively.The direct and indirect effects of neighborhood structure on the radial growth of trees with different diameter classes were explored by path analysis.The results showed that:whether as dominant or associated tree species,the radial growth of small diameter class trees of L.olgensis and Q.mongolica was lower than that of medium and large diameter classes.The radial growth of L.olgensis was lower than that of Q.mongolica in the small diameter class,but higher than that of Q.mongolica in the medium and large diameter classes.The radial growth of small and medium diameter trees was significantly correlated with neighborhood structure,but not for large diameter trees.Open comparison(OP)and competition index(CI)were the main factors affecting the radial growth of L.olgensis and Q.mongolica,and the effect of associated tree species was higher than that of dominant tree species.The effect of neighborhood structure on radial growth gradually decreased with the increase of diameter class.In addition,the indirect interaction between OP and CI also affected the radial growth of L.olgensis and Q.mongolica.Therefore,when forest management was carried out in this area,the small and medium diameter class trees should be selected to adjust neighborhood structure,mainly by improving OP and reducing CI.
tree growthforest spatial structureneighborhood structuretree competitiontree spatial distribution
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