L1 /
14
CH3041
ORGANIC MATTER
• In the tropics temperatures are high and so the
weathering reactions will occur quickly.
10oC increase in T doubles rate of most rxns
10oC increase in T doubles rate of most rxns
• Rainfall is
heavy and this allows constant
flushing of the weathering material, leaching
out all but the most insoluble material
eg. FeOOH (goethite), Al(OH)3 (gibbsite).
flushing of the weathering material, leaching
out all but the most insoluble material
eg. FeOOH (goethite), Al(OH)3 (gibbsite).
• Soil humic matter is the microbially transformed, polymeric organic materials
that persists in soils (humic & fulvic acids).
that persists in soils (humic & fulvic acids).
• Humic matter binds to mineral surfaces thru functional groups & thru chelation to form soluble metal-humic
complexes.
