Dissolved organic carbon (DOC) -- which leaches into freshwater systems from plants, soils, and sediments, and from other detritus present in the water itself -- is the major food supplement for microorganisms and plays an important role in several environmental processes and in the global carbon cycle. In some aquatic systems such as estuaries the optically measurable colored component of dissolved organic matter (CDOM) is often proportional to the concentration of DOC.
URL: http://www.sciencedaily.com/releases/2012/07/120731213633.htm
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