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CH3041
ORIGIN OF D.O.M.
• The origin of the
humic matter is:
(i) imported from breakdown of:
(A) higher plant material (lignins)
(B) microorganisms in the soils.
(i) imported from breakdown of:
(A) higher plant material (lignins)
(B) microorganisms in the soils.
(ii) produced in-situ in a water body
eg. wetlands (swamp) by decay of plant material and dead water microorganisms.
eg. wetlands (swamp) by decay of plant material and dead water microorganisms.
• The formation is either by:
(a) degradative
transformation of lignins (+waxes`…) to HM.
(b) via total
break down of macromolecules to small molecules and then condensation
polymerisation to form HM polymers.
• In the oceans
formation from triglycerides
is thought to be a major route to HM.
is thought to be a major route to HM.
