Abstract
Humic substances are present in all soils and waters where organic matter is decomposing, and in sediments where transformations of organic materials have taken place. There are numerous estimates of the reserves of humic substances in soils, sediments, and waters, and these estimates vary widely. Hayes et al. (1989b) have compiled data from a number of authors which show that the carbon reserves in soil organic matter (Ajtay et al., 1979; Bohn, 1976), are of the order of three to four times greater than the entire contents in biota on land (Bolin et al., 1979), are twice as great as the reserves in the oceans (Mopper and Degens, 1979), are one half of those in fossil fuels, and are only a very small fraction of the carbon bound in sediments (Bolin et al., 1979).
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Hayes, M.H.B., Swift, R.S. (1990). Genesis, Isolation, Composition and Structures of Soil Humic Substances. In: De Boodt, M.F., Hayes, M.H.B., Herbillon, A., De Strooper, E.B.A., Tuck, J.J. (eds) Soil Colloids and Their Associations in Aggregates. NATO ASI Series, vol 214. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2611-1_10
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