Abstract: Carbon dioxide enrichment was one of the key factors that increased atmosphere temperature.Carbon cycle in forest ecosystem,meadow ecosystem,wetland ecosystem and field ecosystem was analyzed as terrestrial ecosystem was one of key carbon sinks in the world.The quantity of allocated and accumulated carbon of different terrestrial ecosystem was emphasized.Meanwhile factors resulted in carbon dioxide emission from terrestrial ecosystem was analyzed in detail.At last,measures of carbon dioxide fixation increases and emission reduction from terrestrial ecosystem were put forward.

Key words: Carbon dioxide, Carbon dioxide, Fixation, Emission reduction, Terrestrial ecosystem