Abstract:Northern forests play an important role in sustaining the balance of carbon dioxide(CO_2)in terrestrial ecosystems, the impact of climate change on spatial pattern and process of forest ecosystems, especially in high latitude forest area, has became an important ecological issue in world wide during past decade. With the increased atmospheric carbon dioxide (CO_2)and global climate change, forest stand structure and species composition in north forest ecosystem are effected from stand scale to landscape lev...