次生林斑块的边缘效应对鸟类分布格局的影响

uring the bird breeding seasons in 2005 and 2006, we investigated 11 patch size using GPS and observed position of bird nests to ascertain distance to edge boundary in fragmented forest in order to analyze edge effects on bird distribution in Zuojia Natural Protection Area in Jilin province. The result showed that patch size changes between 10.9 and 51.2 hm2, with average size 24.8 hm2; By investigating position of bird nest in different distance grade, we obtained that 6 distance grade had been set off and birds mainly concentrated in 0~50 m and 50~100 m; There are no significant difference in these two years during different distance grade (P>0.05); There are great difference during different distance grade for bird species and number, with significant difference (P=0.00); All these had proved edge effect’s existence; Applying dunn test to analyze the difference during different distance grade, the following results obtained that birds concentrate in 0~150 m area, the best edge distance is 150 m.