在三江平原多年考察与研究的基础上,通过典型沼泽的定位观测,估算了三江平原沼泽土壤中的碳储量,探讨了沼泽植物对大气CO₂的固定,碳素自沼泽土壤向大气的转移,沼泽近地气层CO₂流,以及沼泽植物-土壤-大气之间的碳素流动.

The biogeochemical cycle of carbon means carbon flux or exchange among living things, soil and atmosphere. The total marsh area is 1.12×10⁴km² in the Sanjiang Plain. The organic carbide is formed through the photosynthesis of green plants in a marsh ecosystem. The annual primary production of above-ground is estimated at about 471.85×10⁴ t and the annual car-bon contribution is 188.74t. The annual primary production of below-ground is estimated at about 638.07×10⁴t and the an-nual carbon contribution is 0. 78×10⁴ t. The organic matter containing carbon is transformed into soil system through decom-position by consumer in the form of CO₂, return into atmosphere. Carbon released from marsh soil return into atmosphere is 3.95 million t/a.The research shows that in marsh ecosystem of the Sanjiang Plain the accumulation amount(including under-ground part of plants)of carbon of organic dry matter on the marsh surf ace is more than releasing amount of organic matter in soil(or de-composed amount). So peat is accumulat in some marsh surfaces,at the same time, there is the organic matter accumulation in the marsh surface without peat. So marshes become the carbon sink of the Sanjiang Plain. In this area there are 265.30 mil-lion tons of organic carbon accumulated in the marsh land. When the hydrathermal condition of marshes is quite stable, peat in marshes doesn’t join the atmospheric CO₂ cycle. That is to say, peat accumulation is helpful to reducing the process of atmo-spheric CO₂ concentration increase caused by burning mineral fuel and human activities in territorial ecosystem.