The expansion of a bog caused by the gradual rising of the water table as accumulation of peat impedes water drainage.
Found on http://cdiac.ornl.gov/glossary.html
Paludification is the most common process by which peatlands in the boreal zone are formed. The process is characterized by peat initialization on previously drier and vegetated habitats over inorganic soils, with no fully aquatic phase. Thus the paludification process includes a shift from forests, grassland or long exposed bare land to peatland.
Found on http://en.wikipedia.org/wiki/Paludification
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