Effects of manganese addition on carbon release from forest floor horizons
| Autor: | Florence Trum, Hugues Titeux, Bruno Delvaux, Jean-Thomas Cornélis |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Forest floor Global and Planetary Change Ecology biology Chemistry chemistry.chemical_element Forestry Manganese biology.organism_classification Decomposition chemistry.chemical_compound Fagus sylvatica Manganese peroxidase Environmental chemistry Lignin Organic matter Beech |
| Zdroj: | Canadian Journal of Forest Research. 41:643-648 |
| ISSN: | 1208-6037 0045-5067 |
| DOI: | 10.1139/x10-224 |
| Popis: | Lignin concentration in organic residues largely controls their decomposition. Mn2+ may well play a key role in ligninolysis because it is a cofactor of manganese peroxidase, an enzyme of the lignin-degrading system. This study aims to investigate the effects of Mn2+ addition on forest floor horizon decomposition during laboratory incubation. Therefore, we sampled two distinct forest floors from European beech ( Fagus sylvatica L.) stands: a mor and a moder. Lignin and Mn concentrations in forest floor upper layer were significantly larger in moder than in mor. Three horizons from each forest floor were separately incubated with or without Mn2+ addition (250 mg Mn·kg dry matter–1) and the release of both CO2 and dissolved organic C was measured. The dissolved organic C release was not impacted by the Mn2+ addition, while a clear increase in CO2 release from specific horizons was observed. Our data suggest that the impact of the Mn2+ addition depends on (i) the forest floor type and on (ii) the organic matter decomposition stage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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