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Soil organic matter transformations induced by Hieracium pilosella L. in tussock grassland of New Zealand

AuthorsKnicker, Heike ; Saggar, S.; Bäumler, R.; McIntosh, P. D.; Kögel-Knabner, I.
KeywordsCarbon-13 nuclear magnetic resonance
Nitrogen-15 nuclear magnetic resonance
Organic nitrogen
Issue Date2000
CitationBiology and Fertility of Soils 32(3): 194-201 (2000)
AbstractTo study the effect of Hieracium pilosella L. invasion on the transformations of soil organic matter of New Zealand tussock grassland soils (Ustoebrepts), plant material and soils underneath Hieracium, the surrounding halo, and the adjacent herbfield (depleted tussock grassland) were examined for their chemical composition. An attempt was made to reveal possible changes in chemical composition of the soil organic malter induced by H. pilosella invasion. Small differences were detected by solid-state 13C nuclear magnetic resonance (NMR) spectroscopy in the composition of the plant and soil materials from these zones. Most of the differences in soil organic matter occurred due to differences in the amount and quality of plant-residue inputs. Comparable amounts of phenolic C were detected in the solid-state 13C NMR spectra of H. pilosella and herbfield vegetation, while alkaline CuO oxidation yielded considerable lower lignin oxidation products for H. pilosella. A slightly higher proportion of these compounds in H. pilosella soil revealed an accumulation and a low degradation rate of lignin compounds under H. pilosella. The HCI hydrolysis and solid-state 15N NMR spectroscopy showed similar chemical compositions of the N fractions of the three different soils. The absence of 15N NMR signal intensity assignable to aniline derivatives or aromatic heterocyclic N indicates that the condensation of phenolic compounds with N groups plays a minor role in N sequestration in these soils.
Description8 pages, 2 figures, 6 tables, 28 references.
Publisher version (URL)http://dx.doi.org/10.1007/s003740000234
Appears in Collections:(IRNAS) Artículos
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