Which types of wetlands can store most greenhouse

The tropical ones with high productivity we looked at before dont have much carbon storage beacause most biomass will decompose in the soil. Its basicly just a cycle where it stores co2 and then release when they die. We want to store carbon as dedritus and incoporate in the soil. In omnitrophic wetlands they make more dedritus because of low pH and often lower temperatures. If organic matter stays perminatly as peat then we are happy. N2O doesnt seem to be a problem for wetlands because not a lot is produced and a lot is turned into N2. Methane is a way bigger concern.