中文摘要：

洞巢鸟是鸟类的重要组成部分,在生态系统中起到重要的作用.于2006和2007年夏季对北京地区洞巢鸟类的种群数量和群落结构进行了研究,在调查中共记录到15种洞巢鸟,其中留鸟9种,夏候鸟6种.研究结果表明,黄腹山雀（Parusvenustulus）和褐头山雀（Parussongarus）有明显的种群数量优势,其次为北红尾鸲（Phoenicurusauroreus）、普通（Sittaeuropaea）和大山雀（Parusmajor）.北京地区洞巢鸟类群落多样性指数为2.03,均匀性指数为0.81.对小龙门林区不同生境类型的鸟类群落进行分析,发现公路两侧生境洞巢鸟多样性指数最大,落叶阔叶林次之,针阔混交林最低.

英文摘要：

Cavity-nesting bird has important roles in ecosystem.The population density and community characteristics of cavity-nesting bird in Beijing were investigated in their breeding season in 2006 and 2007.A total of 1 5 bird species were recorded,9 were residents and 6 were summer migrants.Yellow-bellied Tit （Parus venustulus ）and Songer Tit （Parus songarus ）had larger population size than Daurian Redstart, Eurasian Nuthatch （Sittaeuropaea）and Great Tit （Parusmajor）.The species diversity index was 2.03 and Pielou index was 0.81.Species diversity index varied in different habitat types,being higher in road habitat than in deciduous broad-leaf forests,and being the lowest in mixed forest.