Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 344704
Title NaOH and Na4P2O7 extractable organic matter in two allophanic volcanic ash soils of the Azores Islands : a pyrolysis GC/MC study
Author(s) Nierop, K.G.J.; Bergen, P.F. van; Buurman, P.; Lagen, B. van
Source Geoderma 127 (2005)1-2. - ISSN 0016-7061 - p. 36 - 51.
Department(s) Earth System Science
Organic Chemistry
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) chromatography-mass-spectrometry - rothamsted classical experiments - hydromorphic forest-podzol - c-13 nmr-spectroscopy - gas-chromatography - chemical-composition - humic acids - vegetation succession - wood - horizons
Abstract NaOH and Na4P2O7 extractable organic matter fractions of two volcanic ash profiles (Azores Islands) were studied by pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). The soils did not have melanic horizons and were not affected by burning. The pyrolysates of all samples were dominated by polysaccharide-derived compounds. The Na 4P2O7 extractable fractions were relatively enriched by markers of lignin, proteins, and lipids. Only in the topsoils (A horizons) did lignin appear to be present in significant amounts and, although present with a high degree of side-chain oxidation, the distribution of lignin-derived products could be related to the overlying vegetation. A similar trend was observed for lipids, in particular the high abundance of C 26 alkanol in profile EUR05 clearly reflecting grass. Below the topsoils, lignin and lipids were hardly detectable. With depth, markers of intact polysaccharides decreased relatively to smaller polysaccharide pyrolysis products. The same is true for chitin. Compared with other soils, the relative abundance of lignin and lipids was remarkably low. The occurrence of large amounts of polysaccharides including chitin points to an important in situ production of soil organic matter by fungi and/or arthropods. There is no indication of preservation of plant-derived organic matter by allophane or Al3+, but the presence of large amounts of (microbial) polysaccharides and chitin suggests that these secondary organic matter products are indeed stabilized.
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