Lignin degradation during a laboratory incubation followed by 13C isotope analysis

Bahri, Haithem; Rasse, Daniel P.; Rumpel, Cornélia; Dignac, Marie-France; Bardoux, Gérard; Mariotti, André

doi:10.1016/j.soilbio.2008.04.002

Cited by 97 publications

(69 citation statements)

References 34 publications

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“…These were similar to previous estimates of total lignin turnover in other ecosystems (10e40 y; Bahri et al, 2008;Heim and Schmidt, 2007;Rasse et al, 2006), and of slow-pool mineral-associated C in this ecosystem (11e26 y; Hall et al, 2015b). Because we measured the most labile constituent of lignin, its methoxyl group (Kirk et al, 1975), our results suggest that the more recalcitrant aromatic C of lignin could persist in soils for decades because of interactions with Fe oxides.…”

supporting

confidence: 89%

Iron addition to soil specifically stabilized lignin

Hall

Silver

Timokhin

et al. 2016

Soil Biology and Biochemistry

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a b s t r a c tThe importance of lignin as a recalcitrant constituent of soil organic matter (SOM) remains contested. Associations with iron (Fe) oxides have been proposed to specifically protect lignin from decomposition, but impacts of Fe-lignin interactions on mineralization rates remain unclear. Oxygen (O 2 ) fluctuations characteristic of humid tropical soils drive reductive Fe dissolution and precipitation, facilitating multiple types of Fe-lignin interactions that could variably decompose or protect lignin. We tested impacts of Fe addition on 13 C methoxyl-labeled lignin mineralization in soils that were exposed to static or fluctuating O 2 . Iron addition suppressed lignin mineralization to 21% of controls, regardless of O 2 availability. However, Fe addition had no effect on soil CO 2 production, implying that Fe oxides specifically protected lignin methoxyls but not bulk SOM. Iron oxide-lignin interactions represent a specific mechanism for lignin stabilization, linking SOM biochemical composition to turnover via geochemistry.

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supporting

confidence: 89%

Iron addition to soil specifically stabilized lignin

Hall

Silver

Timokhin

et al. 2016

Soil Biology and Biochemistry

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“…Greater decomposition of high lignin residues could be a function of low microbial substrate-use efficiency (SUE)-the proportion of assimilated substrates used for growth and enzyme production compared to respiration (Cotrufo et al 2013). Due to the complexity of lignin-cellulose, microbial substrate use efficiency for lignin is low (between 8 and 31 %, Cotrufo et al 2013;Bahri et al 2008), decreasing with increasing lignin content (Lekkerkerk et al 1990) and increasing substrate C:N ratio (Sinsabaugh et al 2013). Lignin-protected cellulose requires initial depolymerization by extracellular enzymes which are energetically costly, resulting in greater respiration.…”

Section: Discussionmentioning

confidence: 99%

Lignin biochemistry and soil N determine crop residue decomposition and soil priming

et al. 2015

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“…The degradation of lignin results in products such as polysaccharides, low molecular mass organic acids, phenolic compounds, and sugar monomers (Guggenberger et al 1994;Kaiser et al 2001), representing substrates that were provided in the used BIOLOG EcoPlates (Insam 1997). After~1 year, however, a large fraction of lignin was transformed into less decomposable lignin polymers (Bahri et al 2008). …”

Section: Discussionmentioning

confidence: 99%

Bacterial community structure and carbon turnover in permafrost-affected soils of the Lena Delta, northeastern SiberiaThis article is one of a selection of papers in the Special Issue on Polar and Alpine Microbiology.

2009

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Arctic permafrost environments store large amounts of organic carbon. As a result of global warming, intensified permafrost degradation and release of significant quantities of the currently conserved organic matter is predicted for high latitudes. To improve our understanding of the present and future carbon dynamics in climate sensitive permafrost ecosystems, the present study investigates structure and carbon turnover of the bacterial community in a permafrost-affected soil of the Lena Delta (72822'N, 126828'E) in northeastern Siberia. 16S rRNA gene clone libraries revealed the presence of all major soil bacterial groups and of the canditate divisions OD1 and OP11. A shift within the bacterial community was observed along the soil profile indicated by the absence of Alphaproteobacteria and Betaproteobacteria and a simultaneous increase in abundance and diversity of fermenting bacteria like Firmicutes and Actinobacteria near the permafrost table. BIOLOG EcoPlates were used to describe the spectrum of utilized carbon sources of the bacterial community in different horizons under in situ temperature conditions in the presence and absence of oxygen. The results revealed distinct qualitative differences in the substrates used and the turnover rates under oxic and anoxic conditions. It can be concluded that constantly negative redox potentials as characteristic for the near permafrost table horizons of the investigated soil did effectively shape the structure of the indigenous bacterial community limiting its phylum-level diversity and carbon turnover capacity.Key words: active layer, soil organic carbon, microbial diversity, permafrost ecosystem. Résumé :Le pergélisol situé dans les zones arctiques constitue une vaste réserve de carbone organique. Le réchauffement climatique accroît la dégradation du pergélisol, ayant pour conséquence une libération massive de matière organique prévue dans les régions de hautes latitudes. De manière à améliorer notre compréhension de la dynamique présente et future du carbone dans les écosystèmes climatiques sensibles, telles que le pergélisol, cette étude examine la structure et le turnover du carbone de la communauté bactérienne contenue dans le sol sous influence directe du pergélisol, dans le delta de la Lena (72822'N, 126828'E) au nord de la Sibérie. Le clonage du gène 16S rRNA a révélé la présence de la totalité des groupes importants de bactéries du sol, ainsi que des divisions présumées OD1 et OP11. Un changement au sein de la communauté bactérienne a été observé le long du profil de sol, indiqué par l'absence des Alphaproteobacteria et des Betaproteobacteria et l'augmentation simultanée de l'abondance et de la diversité des bactéries fermentatives, comme par exemple les Firmicutes et les Actinobacteria, à proximité du pergélisol. Des plaques BIOLOG Eco ont été utilisées sous conditions de température contrôlées et en présence ou absence d'oxygène, afin de décrire le spectre des sources de carbone utilisées par la communauté bactérienne dans les différents horizo...

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Lignin degradation during a laboratory incubation followed by 13C isotope analysis

Cited by 97 publications

References 34 publications

Iron addition to soil specifically stabilized lignin

Iron addition to soil specifically stabilized lignin

Lignin biochemistry and soil N determine crop residue decomposition and soil priming

Bacterial community structure and carbon turnover in permafrost-affected soils of the Lena Delta, northeastern SiberiaThis article is one of a selection of papers in the Special Issue on Polar and Alpine Microbiology.

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