Researchers studied plant biomass and CO2 exchange in a bog near Ottawa, Canada. They found that shrubs and Sphagnum mosses dominated the bog, while sedges and herbs were more common in the poor fen. Biomass was higher where the water table was lower. CO2 uptake by the ecosystem varied with light levels, ranging from uptake in spring and summer to CO2 release during a dry period. The bog sequestered carbon at a rate of 60g/m2 per year, with root production playing a significant role in the carbon budget.