Clay mineral composition modifies decomposition and sequestration of organic carbon and nitrogen in fine soil fractions

Vogel, Cordula; Heister, Katja; Buegger, Franz; Tanuwidjaja, Irina; Haug, Stephan; Schloter, Michael; Kögel‐Knabner, Ingrid

doi:10.1007/s00374-014-0987-7

Cited by 95 publications

(49 citation statements)

References 43 publications

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“…They allow for insight into fundamental questions about soil aggregate development38, organic matter turnover39 and mineralogical influences on microbial communities and decomposition404142. Here we use model soils for real-time monitoring of microbial-SOM formation and demonstrate that microbial processing of simple C substrates produced an abundance of stable, chemically diverse SOM dominated by microbial proteins and lipids, comparable to natural soils.…”

Section: Discussionmentioning

confidence: 94%

Direct evidence for microbial-derived soil organic matter formation and its ecophysiological controls

2016

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Soil organic matter (SOM) and the carbon and nutrients therein drive fundamental submicron- to global-scale biogeochemical processes and influence carbon-climate feedbacks. Consensus is emerging that microbial materials are an important constituent of stable SOM, and new conceptual and quantitative SOM models are rapidly incorporating this view. However, direct evidence demonstrating that microbial residues account for the chemistry, stability and abundance of SOM is still lacking. Further, emerging models emphasize the stabilization of microbial-derived SOM by abiotic mechanisms, while the effects of microbial physiology on microbial residue production remain unclear. Here we provide the first direct evidence that soil microbes produce chemically diverse, stable SOM. We show that SOM accumulation is driven by distinct microbial communities more so than clay mineralogy, where microbial-derived SOM accumulation is greatest in soils with higher fungal abundances and more efficient microbial biomass production.

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Section: Discussionmentioning

confidence: 94%

Direct evidence for microbial-derived soil organic matter formation and its ecophysiological controls

2016

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“…There were larger responses to species mixing at the more nutrient-poor and sandy site. Clayey and loamy soils are known to buffer influences by tree species more strongly than sandy soils [48] and this would explain why we see more effects of beech on Douglas-fir at LØV but not at the more clay-rich and well-buffered CHR site, even in a perspective of 50 years.…”

Section: Effects Of Beech and Douglas-fir Mixturesmentioning

confidence: 88%

Mixed-Species Effects on Soil C and N Stocks, C/N Ratio and pH Using a Transboundary Approach in Adjacent Common Garden Douglas-Fir and Beech Stands

Dawud¹,

Vesterdal²,

Raulund‐Rasmussen³

2017

Forests

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Mixed forest of Douglas-fir and beech has been suggested as one of the possible future forest types in Northwest Europe but the effects of this mixed forest on soil properties relative to monoculture stands are unknown. In a transboundary investigation of adjacent common garden Douglas-fir and beech stands, we determined the effects on topsoil properties. However, responses of C and N stocks, the C/N ratio and pH were site-and soil layer-specific and were mainly single-sided and without synergistic effects. Beech reduced the soil C and N stocks in Douglas-fir at the nutrient-poor site, caused an increase in the C/N ratio in the forest floor and mineral soil at both nutrient-poor and -rich sites, and reduced the acidifying effect of Douglas-fir at the nutrient-poor site. These results do not support the hypothesis that mixture effects would be consistent across sites and soil layers. The lack of synergistic effects may be attributed to the relatively similar litter quality or rooting depth that prevented any larger niche differentiation and complementarity. The results indicate that the transboundary approach within a mature common garden proved useful as a platform to test tree species interactions, and this approach could be explored in soil studies until dedicated mixed-species common gardens reach maturity.

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“…However, this portion of SOC in the macroaggregates is not stable. The decomposition rate of SOC in the >2000 mm macroaggregates was larger than that in microaggregates (Elliott, 1986;Cambardella and Elliot, 1993;Puget et al, 1995), due likely to the chemical properties of organic substance as well as larger pore sizes and higher accessibility associated with the newly formed macroaggregates (Tan et al, 2014;Vogel et al, 2015). SOC in 250-53 mm microaggregates was more stable due to their chemical and physical properties.…”

Section: Aggregate Restructuring and Soc Stabilitymentioning

confidence: 90%

“…These and our studies suggest that the residual HA could modify the composition, structure, and reactivity of soil HA, for instance, being more recalcitrant to microbial attack. Compared with microaggregates, macroaggregates showed less protection for HA from degradation, due likely to larger pore sizes and higher accessibility by microorganism associated with macroaggregates (Tan et al, 2014;Vogel et al, 2015). Stevenson (1982) maintained that HA was more prior to form than FA in the decomposition of plant residues.…”

Section: Soc Transformation In Relation To Incubation Timementioning

confidence: 96%

Isotopic characterization of sequestration and transformation of plant residue carbon in relation to soil aggregation dynamics

Guan

Dou

Chen

et al. 2015

Applied Soil Ecology

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Clay mineral composition modifies decomposition and sequestration of organic carbon and nitrogen in fine soil fractions

Cited by 95 publications

References 43 publications

Direct evidence for microbial-derived soil organic matter formation and its ecophysiological controls

Direct evidence for microbial-derived soil organic matter formation and its ecophysiological controls

Mixed-Species Effects on Soil C and N Stocks, C/N Ratio and pH Using a Transboundary Approach in Adjacent Common Garden Douglas-Fir and Beech Stands

Isotopic characterization of sequestration and transformation of plant residue carbon in relation to soil aggregation dynamics

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