青海省海北地区高寒草甸雀形目鸟类的繁殖生产力

通过对高寒草甸１０种雀形目鸟类繁殖生产力研究表明，高寒草甸鸟类的繁殖生产与鸟类栖息地所处的地理环境、营巢类型和繁殖方式密切相关。其中繁殖季节长度和窝卵数是影响高寒草甸鸟类繁殖生产力的两个最重要的因子（Ｐ〈０．０５）。鸟类平均繁殖生产力为２．８０（只／对．年）。

BREEDING PRODUCTIVITY OF PASSERINE BIRDS IN ALPINE MEADOW IN NORTHERN QINGHAI

We calculated annual breeding productivity (fledglings per pair of adults) of 10 species of Passerine birds in alpine meadow in northern Qinghai, and analyzed the data with multiple correlation and stepwise multiple regression to determine the contribution of each variable to variation in the number of young fledged in the 10 species. Annual breeding productivity can be calculated indirectly from clutch size, breeding success, length of nest cycle and breeding season. Mean breeding productivity was 2 80, which was lower than that reported by Ricklefs (1977). Variations in seasonal length and clutch size were important components in variation of the number of the young fledged. Seasonal length had the strongest correlation with the number of young fledged (r=0 800,P<0 01).