“…are able to adapt by accumulating elements into living cells (Brooks et al, 1973;Bragazza et al, 2004) through the biosynthesis of unesterified polyuronic acids in their cell walls (Clymo, 1983). The decomposition of Sphagnum plants releases organic substances containing a great number of negatively charged functional groups, that can retain positively charged elements (Clymo, 1983).…”