Fine root distribution and turnover in a broad-leaved and Korean pine climax forest of the Changbai Mountain in China

This study is focused on the vertical distribution‚production and turnover of the fine roots in a broadleaved and Korean pine climax forest of the Changbai Mountain Reserve．The results show that the average biomass of fine roots is 827∙8g / m²．The vertical distribution of fine roots accords with exponential regression curve and abundant fine roots are concentrated in the 0～1 0cm top soil．Soil bulk density‚temperature‚and C and N content affect the fine root depth distribution significantly （ P＜0∙01）．In the broad- leaved Korean pine climax forest‚the fine root climax production of the community occurs in July and October‚but the dominant arboreal species‚understory arboreal species and fine roots of grass have a different production dynamics．It is important to sort the fine root species because accurate fine root production sources have a different fine root dynamics．Based on the dominant arboreal species‚understory arboreal species and fine roots of grass dynamic‚the annual production of community’ s fine roots is 912·4g / m²．