Abstract: Bird Diversity in Yumen was investigated using the line transect method from April 2013 to June 2019. A total of 97 bird species were recorded that belong to 36 families and 17 orders. Among the 97 species, 1 species was a first-class national protected bird and 10 were second-class national protected bird in China. Among the settlements, summer migrants(53) and resident species (23) were dominating, and accounted for 54.64% and 23.71% of the observed species, respectively. Bird composition in settlements varied slightly by year (F_{2, 20}=1.358, P=0.296). Among the four habitats, the bird species diversity in wetland habitats was the highest, and the bird species diversity in village habitats was the lowest. The similarity index between farm forest and village habitats was the highest, whereas that between wetland and village habitats was the lowest. The diversity index and evenness index of birds in wetland and desert habitats were significantly different from those in other habitats (P<0.05), but the diversity and evenness index of birds in farmland and open forest were not significantly different from those in villages (P=0.065). The correlation analysis show that there was no significant correlation between average precipitation from April to May and bird diversity index (r=0.02, P>0.05), but there was a significant positive correlation between average temperature from April to May and bird diversity index (r=0.879, P<0.05). The change in the bird community in Yumen during the reproductive period was generally stable and there was little fluctuation during these years.

Key words: Yumen, bird diversity, reproductive period, annual change