Abstract: Korean pine forest has three typical succession periods: Clearcut area (including fired area), natural second-growth forest and natural forest. Birds community structure changed with succession periods: (1) birds species are different in 3 periods, every period has typical species; (2) birds species changed with succession period of the forest; (3) birds density is different in different periods; (4) more and more parts of bird species distributed in upper level with succession period; (5) Species diversity index in the natural second-growth forest is the highest.

Key words: nitrogen application rate, faba bean fusarium wilt, soil microbial functional diversity.