Abstract: The community structure and seasonal dynamics of birds at four habitats in Honghaizi Wetland Park of Yijinhuoluo, Inner Mongolia were investigated from October 2012 to September 2013 utilizing line transects and the fixedradius points method. A total of 116 bird species were recorded, which belonged to 16 orders, 36 families. Among them, 49 were summer visitors, 9 winter visitors， 24 residents and 34 passage migrants. The diversity index of birds was highest in spring and lowest in winter. The similarity index of birds was highest between spring and summer, and lowest between summer and winter. The bird community structure of each habitat changed significantly with season and interacted with food, water source, shelter conditions, breeding conditions and other relevant factors. On April 12 of 2013, a total of 2340 Relict Gulls (Larus relictus, a first class national protected bird species in China) were spotted at Honghaizi Wetland Park. This finding indicated that this area was an important feeding site for Relict Gull in spring. This study provides fundamental data for protecting wetland bird resources and ecological environment of Honghaizi Wetland Park.

Key words: cone and seed, natural population, Cupressus chengiana, phenotypic trait, environmental factor