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| Titel |
Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests |
| VerfasserIn |
S. Bischoff, M. T. Schwarz, J. Siemens, L. Thieme, W. Wilcke, B. Michalzik |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 9 ; Nr. 12, no. 9 (2015-05-07), S.2695-2706 |
| Datensatznummer |
250117926
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| Publikation (Nr.) |
 copernicus.org/bg-12-2695-2015.pdf |
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| Zusammenfassung |
We present the first investigation of the composition of dissolved organic
matter (DOM) compared to total organic matter (TOM, consisting of DOM, < 0.45 μm and particulate organic matter 0.45 μm < POM < 500 μm) in
throughfall, stemflow and forest floor leachate of common beech
(Fagus sylvatica L.) and Norway spruce (Picea abies (L.)
H. Karst.) forests using solid-state 13C nuclear magnetic resonance
(NMR) spectroscopy. We hypothesized that the composition and properties of organic matter
(OM) in forest ecosystem water samples differ between DOM and TOM and between the
two tree species.
The 13C NMR results, derived from 21 samples, point to pronounced
differences in the composition of DOM and TOM in throughfall solution at the
beech sites, with TOM exhibiting higher relative intensities for the alkyl C
region, which represents aliphatic C from less decomposed organic material
compared to DOM. Furthermore, TOM shows lower intensities for lignin-derived
and aromatic C of the aryl C region resulting in lower aromaticity indices
and a diminished degree of humification. Across the ecosystem compartments,
differences in the structural composition of DOM and TOM under beech lessened
in the following order: throughfall > stemflow ≈ forest floor leachate.
In contrast to the broadleaved sites, differences between DOM and TOM in
throughfall solution under spruce were less pronounced and spectra
were, overall, dominated by the alkyl C region, representing aliphatic C.
Explanations of the reported results might be substantiated in differences in
tree species-specific structural effects, leaching characteristics or
differences in the microbial community of the tree species' phyllosphere and
cortisphere. However, the fact that throughfall DOM under beech showed the
highest intensities of recalcitrant aromatic and phenolic C among all samples
analysed likely points to a high allelopathic potential of beech trees
negatively affecting other organisms and hence ecosystem processes and
functions. |
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