Characteristics of Branching and Leave Spreading of Young Bamboos in Degenerated Forests of Phyllostachys violascens'Prevernalis'
[Objective]To explore the characteristics of branching and leaf spreading of forests of young Phyllostachys violascens'Prevernalis',our study aims to reveal the trade-off relationship between the branches and leaves and the countermeasures to adapt to the environment,which can provide a reference for the scientific management of degraded bamboo forests.[Method]With the bamboo forests of degraded and normal growth as the contrast,the upper,middle,and lower branches and leaves from young bamboos were collected.The branch length,base diameter,biomass of branches and leaves,leaf number,single leaf area,and specific leaf area of each branch were measured,and variance and allometric growth were analyzed.[Result]Compared with normal forests,the leaf length,leaf width,leaf thickness,single leaf area,and single leaf dry weight in degraded bamboo forests decreased significantly,and fresh and dry weight of branches and leaves,total leaf area,and leaf area density decreased by more than 1/3,but leafing intensity and specific branch length increased significantly.There were no significant responses to the degraded bamboo forests in branch length,branch width,branch wiseness ratio,specific leaf area,leaf number,leaf and branch biomass ratio,leaf area ratio,and leaf number density.There was a positive correlation between leaf dry weight and single leaf area,stem dry weight and leaf dry weight and leaf area,but the allometric growth index decreased under the influence of bamboo forest degradation.[Conclusion]The degradation of bamboo forests seriously affects the morphogenesis of new bamboo branches and leaves and the ability of branching and leave spreading.Upon the degraded stands,the young bamboos tend to quantity growth of branches and leaves,leaf spreading efficiency of young bamboo branches decreases,which demonstrate the adaptive responses to environmental stressors.
Phyllostachys violascens'Prevernalis'Branching and leave spreadingAllometry growthTrade-off relationshipEnvironmental adaptation strategy
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