Soil organic matter transformation in Argentinian Hapludolls

verfasst von

Wolfgang Zech, Georg Guggenberger, Pablo Zalba, Norman Peinemann

Abstract

Distribution and transformation of SOM in an Argentinian Hapludoll under arable land use and afforested with Pinus radiata was investigated by a combined approach using particle-size fractionation, wet-chemical analysis and ¹³C NMR spectroscopy. The soils showed thick mollic A horizons and had high organic carbon (OC) contents even in the subsoil, clay-sized separates having the highest OC concentrations. Under pine, a thick forest floor was built up. CuO oxidation data indicated low transformation of lignin in the forest floor, but advanced oxidative decomposition in the mineral soil horizon. In contrast, non-cellulosic carbohydrates, appeared to be stabilized in the mineral soil horizon against mineralization. Humic acids extracted from the mineral soil horizons showed an extremely high aromaticity. We assume that this was due to the production of pyrogenic aromatic moieties (black carbon) as a result of frequent fires in this ecosystem. No clear profile differentiation with respect to SOM quality was obtained. Composition of SOM in the mineral soil appeared not yet influenced from land use.

Externe Organisation(en)

Universität Bayreuth
Universidad Nacional del Sur

Typ

Artikel

Journal

Journal of Plant Nutrition and Soil Science

Band

160

Seiten

563-571

Anzahl der Seiten

9

ISSN

1436-8730

Publikationsdatum

1997

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Bodenkunde, Pflanzenkunde

Ziele für nachhaltige Entwicklung

SDG 15 – Lebensraum Land

Elektronische Version(en)

https://doi.org/10.1002/jpln.19971600507 (Zugang: Geschlossen)