NDLI: The Organic Fraction

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The Organic Fraction

Content Provider	Scilit
Author	Duchaufour, Philippe
Copyright Year	2020
Description	It is possible to show a parallel between the transformation of organic matter and that of mineral material: fresh organic matter (FOM) gives rise to humus somewhat in the same manner as primary minerals give rise to clay minerals. Fresh organic matter thus constitutes the raw material of humus: it is formed from plant and animal debris of all kinds, which are superposed on the mineral soil (forest litter) or are incorporated in it (cultivated soils). The complex molecules of fresh organic matter first undergo microbial decomposition or transformation that releases simple, mostly soluble compounds. One part undergoes the process of mineralization, i.e., is transformed into soluble or gaseous mineral compounds (for example, $CO_{2}$); this is primary mineralization, rather rapid in biologically active environments, some of these compounds also being, on the other hand, reorganized during humification. Another part escapes mineralization and serves as the source material for formation of new, more and more complex molecules, dark-coloured and colloidal in nature, the ensemble of which constitutes humus in the strict sense. This is humification. These 'humic compounds' are involved in more or less close bonding with mineral compounds (clay minerals and oxides); they are in turn then mineralized, but more slowly than fresh organic matter (secondary mineralization, Fig. 10). Book Name: Handbook of Pedology
Related Links	https://content.taylorfrancis.com/books/download?dac=C2004-0-32236-8&isbn=9781003078050&doi=10.1201/9781003078050-4&format=pdf
Ending Page	47
Page Count	19
Starting Page	29
DOI	10.1201/9781003078050-4
Language	English
Publisher	Informa UK Limited
Publisher Date	2020-07-26
Access Restriction	Open
Subject Keyword	Book Name: Handbook of Pedology Water Science and Technology Organic Matter Clay Minerals Humification Soluble Undergoes
Content Type	Text
Resource Type	Chapter

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