落叶阔叶林中初级洞巢鸟在群落组织结构形成中的作用

在落叶阔叶林中对初级洞巢鸟在群落组织结构形成中的作用做了5a的研究。结果表明,在39.8hm2样地中共有17种鸟类组成,年间鸟种多样性相似。初级洞巢鸟5a中共啄洞108个,每年的递增率为29.4%,被次级洞巢鸟总利用率为58.8%~84.6%,其多度和丰富度都在50%以上,在鸟类群落组织结构形成中的贡献率为12.5%~42.9%。因此可以认为初级洞巢鸟是落叶阔叶林中鸟类群落组织结构形成中的“关键类群”。

Function of Primary Cavity-nesting Birds on Bird Community Structure in Deciduous Broad-leaved Forest

A five-year survey was conducted to study the function of the primary cavity-nesting birds on community structure in deciduous broad-leaved forest. Result showed that there are 17 species of birds in a 39.8 hm2 sample plot, and the bird diversity for each year is similar. The primary cavity-nesting birds produced 108 cavities during the five years, and the increasing rate of cavity was 29.4 percent. The comprehensive utilization rate by secondary cavity-nesting birds ranged from 58.8 percent to 84.6 percent. Both the richness and the abundance were above 50 percent, and the contribution rate of primary cavity-nesting birds to bird community formation was between 12.5 percent and 42.9 percent. Therefore, primary cavity-nesting birds can be regarded as the key group in bird community structure in deciduous broad-leaved forest.