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Nitrogen and Carbon Dynamics and the Role of Enchytraeid Worms in Decomposition of L, F and H Layers of Boreal Mor
Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
Department of Biology, University of Eastern Finland, P.O. Box 111, Joensuu 80101, Finland.
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2012 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 223, no 7, p. 3701-3719Article in journal (Refereed) Published
Abstract [en]

Decomposition of organic material releases carbon dioxide (CO2) into the atmosphere, and dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and ammonium (NH4-N) into soil water. Each of the decomposition products contributes differently to overall export of carbon (C) and nitrogen (N) to water courses. Our aim was to study the quantity and composition of the released C and N as affected by the organic material and soil fauna, represented by enchytraeid worms. We measured the release rate of carbon dioxide, and calculated the release rates for DOC and dissolved N in soil from repeated measurements of DOC and N pools during laboratory incubation of litter (L), fermented (F) and humus (H) layers of boreal forest mor. The intermediate decomposition products, DOC and DON, were characterised according to the molecule size. The release rate of the decomposition products was higher for fresh than for old organic material. The majority of N and C were released as NH4-N and CO2, respectively. The amount of extractable organic N in soil decreased by time but DON increased. Enchytraeids stimulated N mineralisation and the release of large molecule size DOC, particularly in L layer. The results suggest that organic N in extractable form biodegrades effectively, and that soil fauna have an important role in the decomposition. The results were interpreted from the water quality point of view and the implications of the results to modelling of decomposition and export of DOC and dissolved N to recipient water bodies are discussed. In the modelling context, the novelty of the study is the description of the intermediate decomposition products and the division of the dissolved organic compounds into low molecular weight and high molecular weight fractions.

Place, publisher, year, edition, pages
2012. Vol. 223, no 7, p. 3701-3719
Keywords [en]
Ammonium, Carbon dioxide, Dissolved organic carbon, Dissolved organic nitrogen, Nitrate, Soil fauna
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-17250DOI: 10.1007/s11270-012-1142-4ISI: 000307276400011Scopus ID: 2-s2.0-84865529680OAI: oai:DiVA.org:miun-17250DiVA, id: diva2:563212
Available from: 2012-10-29 Created: 2012-10-27 Last updated: 2017-12-07Bibliographically approved

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Bylund, Dan

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