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密度制约对物种共存起着重要作用。随着密度制约效应研究的深入,亲缘关系较近的物种间表现出的密度制约效应逐渐被人们认识。本研究基于2009和2014年对宝天曼1 ha落叶阔叶林样地的2次调查数据,利用广义线性混合模型分析了重要值排名前11位的物种不同邻域尺度的密度制约效应对不同径级(小径级(1 cm≤DBH<5cm)、中径级(5 cm≤DBH<10 cm)、大径级(DBH≥10 cm))目标个体存活的影响。研究表明:(1)5年间样地中DBH≥1 cm的所有个体的年均死亡率和增员率分别为5.85%和0.27%;(2)有5个物种的个体存活率与同种邻体个体数及同种邻体胸高断面积显著负相关;(3)小径级个体的存活在5 m的邻域范围内受同种密度制约和谱系密度制约的影响都很显著;中径级个体在3个尺度上受到的密度制约和谱系密度制约的影响都不大;大径级个体在7.5m、10 m邻域范围内受谱系密度制约影响显著。结果表明,同种密度制约和谱系密度制约效应对宝天曼落叶阔叶林不同生长阶段的树木个体影响不同。
Density constraints play an important role in the coexistence of species. With the deepening of the research on the effect of density control, the density control effect between closely related species has gradually been recognized. Based on the data from two surveys of Po-Ti-Man 1-ha deciduous broad-leaved forest in 2009 and 2014, this study analyzed the effect of density-constraining effects on the scales of different neighborhoods of the top 11 most important species in terms of generalized linear mixed models. (1 cm≤DBH <5 cm), medium diameter (5 cm≤DBH <10 cm), large diameter (DBH≥10 cm)). The results showed that: (1) The average annual mortality and increase rate of all individuals with DBH≥1 cm in the five years were 5.85% and 0.27%, respectively; (2) The survival rate of five species with the same species Body size and the thymus area of allo-neighbors were significantly negatively correlated with each other. (3) The survival of path-size individuals within the 5-m neighborhood was significantly affected by the same density control and lineage density constraints. The effects of density constraints and lineage density constraints on the three scales are not significant. Large-diameter individuals are significantly affected by the lineage density constraints in the 7.5m, 10m neighborhood. The results showed that the same density control and pedigree density control effects had different effects on individual trees in different growth stages of Po deciduous broad-leaved forest.