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- W2578603802 abstract "Abstract Decreasing O2 and increasing CO2 concentrations in the soil atmosphere with depth are one possible factor controlling C sequestration in subsoil. This study aimed to investigate the impact of these subsoil-specific gas conditions, which were measured in the field, on the decomposition of native soil organic C (SOC) and plant residues. Soil samples were taken on two neighbouring arable sites; one with high and the other with low SOC contents below 30 cm depth. An incubation experiment was carried out for 176 days, using gas conditions with reduced O2 and increased CO2, matching gas conditions measured in subsoil. Three different gas concentrations were used in the experiment: Ambient, medium (17% O2; 4% CO2) and extreme (13% O2; 8% CO2). These gas treatments were applied to samples with and without the addition of C4 plant residues to the sampled soil. We determined the effects of these treatments on contents of SOC, microbial biomass C (MBC) and fungal ergosterol. Plant residue addition caused negative priming effects on SOC mineralisation in the subsoils. The contribution of plant-derived to total MBC was reduced under medium and extreme gas conditions (topsoil: 31%; subsoil: 54%). However, neither medium nor extreme gas conditions had general effects on MBC and microbial activity indices. There was no evidence that changes in the soil atmosphere are a major factor controlling C sequestration in subsoil. However, some results indicate that changes in soil atmospheric conditions do have an impact on microbial substrate use, which should be considered in C sequestration research in subsoil." @default.
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- W2578603802 date "2017-04-01" @default.
- W2578603802 modified "2023-09-26" @default.
- W2578603802 title "Plant residue and native organic matter decomposition under subsoil-specific gas conditions – Comparing topsoils with C-poor and C-rich subsoils" @default.
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- W2578603802 doi "https://doi.org/10.1016/j.geoderma.2017.01.005" @default.
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