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A Compar ison of Bird Commun ity Structure between the Pr imary Pine Plantationand the Secondary Evergreen Broad-leaved Forest in Zhejiang, China Responses of Bird Communities to Restoration of Coniferous Plantations in a Previous Degraded Forest Ecosystem Diversity and Seasonal Variations of Avian Community on the Yangtze River Beach, Anqing, China Characteristics of Bird Communities at Different Green Belts of Beijing Urban Area in Summer Characteristics of Bird Community in Beijing Urban Greenland in Winter THE SEASONAL CHANGES OF BIRD COMMUNITY AND BIRD SPECIES DIVERSITY IN MASSON PINE(PINUS MASSONIANA LAMB.) PLANTATION IN NORTHERN ZHEJIANG PROVINCE WINTER AND SUMMER BIRD COMMUNITIES AND BIRD SPECIES DIVERSITIES IN MIDDLE AGE AND YOUNG MASSON PINE PLANTATIONS IN NORTHERN ZHEJIANG PROVINCE Progresses of Studies on Biodiversity of Urban Birds