A REVIEW ON THE DISTRIBUTION PATTERNS OF CARBON DENSITY IN TERRESTRIAL ECOSYSTEMS Conversion of Terrestrial Ecosystems and Carbon Cycling A review on the functions of nitrogen-fixers in terrestrial ecosystems An overview of current methods to estimate carbon budget of terrestrial ecosystems Priority analysis on conserving China’s terrestrial ecosystems Discussion of carbon sequestration estimates in the island terrestrial ecosystems ECOLOGICAL EFFECTS OF INCREASED NITROGEN DEPOSITION IN TERRESTRIAL ECOSYSTEMS LAND USE/COVER CHANGE EFFECTS ON CARBON CYCLING IN TERRESTRIAL ECOSYSTEMS