Clay-sized organo-mineral complexes in a cultivation chronosequence: revisiting the concept of the ‘primary organo-mineral complex’
作者： C. Chenu , A. F. Plante
DOI: 10.1111/J.1365-2389.2006.00834.X
关键词: Mineral 、 Organic geochemistry 、 Dispersion (geology) 、 Soil chemistry 、 Fractionation 、 Mineralogy 、 Chemistry 、 Environmental chemistry 、 Primary (chemistry) 、 Organic matter 、 Soil water 、 Soil science
摘要: Summary Primary organo-mineral complexes are defined as organic matter (OM) bound to primary mineral particles, isolated after complete dispersion of soil. Organic present in < 2 μm particle-size fractions soils has slow turnover times and it is assumed be stabilized mainly by interaction with minerals. We aimed quantify how much the was free versus minerals describe nature association. Furthermore, we hypothesized that this more resistant biodegradation than particles. tested using a cultivation chronosequence on temperate silty quantified clay-bound density fractionation coupled elemental analyses, well transmission electron microscopy (TEM) image analyses. Both methods showed minor fraction depleted matter. deduced biodegradation. TEM distribution clay-sized patchy many so-called ‘particles’ were fact nanometre- micrometre-sized microaggregates which OM encrusted or coated conclude true do not correspond reality must regarded conceptual entities. suggest very small microaggregates, evidenced here, major sites stabilization, both adsorption entrapment
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