宁夏贺兰山自然保护区夏季鸟类群落结构

2002年和2003年的7～8月，采用路线统计法在宁夏贺兰山国家级自然保护区对夏季鸟类的群落结构进行了研究。结果表明，保护区内夏季共有鸟类8目20科65种，其中古北界鸟类53种，占该地区鸟类种数的81．54％；广布种类12种，占18．46％。在4种植被类型的群落中，无论是鸟类的种类、平均密度，还是物种多样性指数、均匀度，都具有相同的规律，即山地草原带〉山地疏林草原带〉山地针叶林带〉高山灌丛草句带。对各鸟类群落密度进行t检验表明，各群落之间鸟类的密度差异极显著（P〈0．001）。

Avian Community Structure of Helan Mountain Nature Reserve in Ningxia during Summer

Avian community structure was studied in Helan Mountain National Nature Reserve during summer by transect lines methods from July to August during 2002 and 2003. Results showed that 65 species, which belong to 8 orders and 20 families, were recorded during the survey. Among them, 53 species distribute in the Palaeartic realm, accounting for 81.5% of the total species, while 12 species distribute widely, accounting for 18.64%. Four habitat types showed the same order in species, average density, species diversity index, and evenness during the study, namely, montane grassland, montane savanna, montane conifer, and alpine shrub meadow, respectively. T-test indicated a significant difference in species density between different avian communities (P<0.001).