Nest-site Selection Of Forest Avians In Lake Xingkai Nature Reserve

In 2006 and 2007, nests survey in nature forests of the Lake Hillock were conducted in the Lake Xingkai Nature Reserve. The results showed that there were 30 breeding species in 6 orders, 15 families and 24 genera and 23 species in 2006, 21 species in 2007.The analysis results of 186 nests showed that the nest-sites of the avian community revealed the obvious gradient attribute spatially, the heterogeneity of avian nesting spatially in the vertical direction. Nests can be divided into four layers accoring nest height(h): the grand nest layer ( h=0m), the middle-lower layer (010m). And the horizontal distribution of nests were restricted by vegetation type: the arborous forest had the most abundant of the avian diversity (H = 1.764), 10 -50m far way from the road and within 20m to the forest edge were the optimal regions for birds nesting niches analysizing showed that Oriental Reed Warbler had the most wide niche breadth (FT = 0.31748), next was Radde's Warbler(FT=0.29534), Grey-capped Woodpecker, Red-fniled shrike, Great Spotted Woodpecker et al.Measuring eight Habitat factors around the nest according to three layers (upper-middle in upper and middle-lower layer) by using Analyze-data reduction-factor in SPSS software, the rusults showed that the upper layer can be divided to 3 main components,disturbance, species nest-sites in the minimum safe distance and; the middle in upperlayer was divided to 4 main components are vegetation factors(the distances of nests to the forest edge, vegetation type, nest-tree diameter), disturbance, cover and nest-height; the middle in lower divided in 4 main components are nest-tree, disturbance, cover and nest-height. Contrasting analysis of nest volume, nest-height, nest distance to the forest edge and nest distance to road showed that along with nest-height raising, the nest volume gradually become larger. In forest avian communites, nesting birds with big size would select the upper layers, and the small one would select the low layers; But the distances of nests to the forest edge and to ro ad have no obvious change.