The Research Of Bird Communities Structure Of Grassland-Forest Ecosystem In Honghuaerji Of Inner Mongolia

From May to June 2001~2005 (except 2003), in the Honghuaerji area of Inner Mongolia, sampling method was applied to investigate the Bird Communities Structure of Grassland-Forest Ecosystems, Results indicated that:(1)In the Honghuaerji area, Passeriformes, Charadriiformes and Anseriformes were main birds, in summer reproducing season. According to the avifauna, palaearctic and cosmopolitan species were 48, 26, which accounted for 64.86%, 35.14% respectively. The palaearctic species were the most, and Oriental species were not founded.(2) In the 8 habitats types, the bird diversity index from high to low as follows: the reed wetland (2.4874), the natural Mongolian pine forests (2.4587), interforest grassland (2.2141), the brush grassland (2.1999), the Carex wetland (2.0642), the artificial Mongolian pine forests (1.8945), the burned forests areas (1.8497) and grassland (1.3466). Similar index of the bird community of the burned forests areas and the brush grassland was high, however, and the artificial Mongolian pine forests were low.(3)In the grassland habitat, the relevance of bird species diversity with the grass height and the covering degree of grass were highly remarkable, respectively. The relevance of bird density with the grass height and the covering degree of grass were not highly remarkable, respectively. In the Mongolian pine forests, Foliage height diversity (FHD) and Bird species diversity (BSD) presented the high correlation (r=0.814, P <0.05), the regression equation was y=1.332x+0.103 (R~2=0.663). Total foliage (IF) had clearly connected with BSD(r=0.912, P <0.05), the regression equation was y=1.267x+0.428 (R~2=0.832). The Mongolian pine DBH and canopy density had the remarkable correlation with BSD, respectively. However, The Mongolian pine height, density and the height and covering degree of grass under forest highly was not remarkable relevance with BSD respectively. The Mongolian pine canopy density had the remarkable correlation with bird density that increased with canopy density increasing. However, The Mongolian pine height, density, DBH and the height and covering degree of grass under forest highly was not remarkable relevance with bird density, respectively.(4) The bird diversity and the bird density gradually increased with the time increasing after the Mongolian pine forests were burned. Each year bird communities composition was different, but the difference was not remarkable (F=0.205, P >0.05), which explained that the change of bird communities in burned Mongolian pine forests was slow. In the ninth year after burned, the number of bird species was 52.63% of the natural Mongolian pine forests in the same year, but the bird communities composition had the remarkable difference (F=11.712,P <0.05), which indicated the burned Mongolian pine forests slowly restored to the naturalMongolian pine forests.