Decomposition of organic matter in submerged soil is carried out by

The decomposition of organic matter in submerged soil is carried out by Bacteria.
Organic matter refers to organic components of soil, including small fresh plant residues and small living soil organisms, decomposing organic matter, and stable organic matter i.e. humus.
Decomposition of organic matter in submerged soil is carried out by Bacteria and releases different products like carbon dioxide, energy, water, plant nutrients and resynthesized organic carbon compounds.