邻体相互作用对温带次生林树木生长及稳定性的影响OA

Clarifying the impact of neighborhood interactions on tree growth and TS(temporal stability)is crucial for evaluating the productivity and stability of natural forests.However,relevant studies remain scarce.This study takes the dominant tree species Liriodendron tulipifera and the non-dominant tree species Fagus grandifolia in the permanent plots of a temperate secondary forest as examples.This work uses BAI(basal area increment)to represent tree growth,and analyzed the impact of neighborhood interactions on tree growth and TS.The results showed that:1)The growth rate and TS of both tree species increased significantly with increasing diameter at breast height.The two species differed in that the growth rate of Liriodendron tulipifera increased more rapidly with diameter at breast height than that of Fagus grandifolia.2)The mean BAI was more important for TS than the standard deviation of BAI.In addition,neighborhood competition reduced the growth of target trees,and thus reduced tree TS;3)Intraspecific and interspecific competition impacted the growth and TS of dominant and non-dominant tree species differently.The growth and TS of Liriodendron tulipifera were significantly negatively correlated with the intraspecific and interspecific competition intensity(p<0.05),while the growth and TS of Fagus grandifolia were only significantly negatively correlated with the interspecific competition intensity(p<0.05).In conclusion,reducing the number of trees of the same and different species helps increasing the growth rate and TS of Liriodendron tulipifera.Only reducing interspecific competition can increase the growth rate and TS of Fagus grandifolia.