Journal Article FZJ-2019-03024

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Dissolved organic matter characteristics of deciduous and coniferous forests with variable management: different at the source, aligned in the soil

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2019
Copernicus Katlenburg-Lindau [u.a.]

Biogeosciences 16(7), 1411 - 1432 () [10.5194/bg-16-1411-2019]

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Abstract: Dissolved organic matter (DOM) is part of thebiogeochemical cycles of carbon and nutrients, carries pol-lutants and drives soil formation. The DOM concentrationand properties along the water flow path through forestecosystems depend on its sampling location and transfor-mation processes. To improve our understanding of the ef-fects of forest management, especially tree species selec-tion and management intensity, on DOM concentrations andproperties of samples from different ecosystem fluxes, westudied throughfall, stemflow, litter leachate and mineral soilsolution at 26 forest sites in the three regions of the Ger-man Biodiversity Exploratories. We covered forest standswith three management categories (coniferous, deciduousage class and unmanaged beech forests). In water samplesfrom these forests, we monitored DOC concentrations over 4years and characterized the quality of DOM with UV-vis ab-sorption, fluorescence spectroscopy combined with parallelfactor analysis (PARAFAC) and Fourier transform ion cy-clotron resonance mass spectrometry (FT-ICR-MS). Addi-tionally, we performed incubation-based biodegradation as-says. Multivariate statistics revealed strong significant ef-fects of ecosystem fluxes and smaller effects of main treespecies on DOM quality. Coniferous forests differed fromdeciduous forests by showing larger DOC concentrations,more lignin- and protein-like molecules, and fewer tannin-like molecules in throughfall, stemflow, and litter leachate.Cluster analysis of FT-ICR-MS data indicated that DOMcompositions, which varied in aboveground samples depend-ing on tree species, become aligned in mineral soil. Thisalignment of DOM composition along the water flow pathin mineral soil is likely caused by microbial production andconsumption of DOM in combination with its interactionwith the solid phase, producing a characteristic pattern of or-ganic compounds in forest mineral soils. We found similarlypronounced effects of ecosystem fluxes on the biodegradabil-ity of DOM, but surprisingly no differences between deciduous and coniferous forests. Forest management intensity,mainly determined by biomass extraction, contribution ofspecies, which are not site-adapted, and deadwood mass, didnot influence DOC concentrations, DOM composition andproperties significantly.

Classification:

Contributing Institute(s):
  1. Agrosphäre (IBG-3)
  2. Jülich Supercomputing Center (JSC)
Research Program(s):
  1. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)
  2. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)

Appears in the scientific report 2019
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Medline ; Creative Commons Attribution CC BY 4.0 ; DOAJ ; OpenAccess ; BIOSIS Previews ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection ; Zoological Record
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 Record created 2019-05-20, last modified 2021-01-30


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