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Fulvic acid composition in degraded fenlands

Title data

Leinweber, Peter ; Schulten, Hans-Rolf ; Kalbitz, Karsten ; Meißner, Ralph ; Jancke, Harald:
Fulvic acid composition in degraded fenlands.
In: Journal of Plant Nutrition and Soil Science. Vol. 164 (2001) Issue 4 . - pp. 371-379.
ISSN 1436-8730
DOI: https://doi.org/10.1002/1522-2624(200108)164:4<371::AID-JPLN371>3.0.CO;2-9

Abstract in another language

Fulvic acids (FAs) from topsoil and ground water solutions were investigated to discover effects of land use and peat degradation on their molecular chemical composition and thermal proper-ties. The FAs were extracted from three Gleysols under arable land, intensive and extensive grassland, and from three Histosols under alder forest, extensive grassland, and a natural succession in a long-term (> 200 years) cultivated fen area. Functional groups and molecular subunits of the FAs were investigated by C-13 Nuclear Magnetic Resonance (C-13 NMR) spectroscopy. Thermal properties and structural molecular subunits were investigated by off-line pyrolysis, and Pyrolysis-Field Ionization Mass Spectrometry (Py-FIMS). The C-13 NMR spectra showed that the FAs from topsoil solutions had smaller proportions of alkyl C (mean: -8 %) and more aromatic C (mean: + 6 %) than FAs from ground water. This clear differentiation of dissolved FAs in the soil profiles is consistent with Py-FIMS data which have shown enrichments of lipids in ground water FAs. Furthermore, Py-FIMS revealed that the FAs from topsoils were richer in phenols + lignin monomers, carbohydrates, as well as mostly aromatic NI-containing compounds. These molecular subunits of FAs, relatively enriched in topsoil, were also the main indicators of land use and peat degradation. For topsoil solutions, the proportions of phenols + lignin monomers and carbohydrates increased stepwise with peat degradation in Gleysols and Histosols. Correspondingly, the thermal properties indicated the incorporation of these compounds into FAs by chemical bonds of larger thermal stability. Statistical evaluation by principal component analysis of Py-FIMS clearly supported the differentiation of FAs according to the origin from topsoils and ground water, different soil types, and land use and peat degradation. Hence, it is concluded that water soluble FAs can be utilized as objective ecological indicators for soil effects on adjacent ground and surface waters.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7517
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 09 Oct 2015 05:56
Last Modified: 09 Oct 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20268