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Open Access Green as soon as Postprint is submitted to ZB.
Tracing organic carbon and microbial community structure in mineralogically different soils exposed to redox fluctuations.
Biogeochemistry 143, 31-54 (2019)
Submerged rice cultivation is characterized by redox fluctuations and results in the formation of paddy soils, often accompanied by soil organic carbon (SOC) accumulation. The impact of redox fluctuations and the underlying soil type on the fate of organic carbon (OC) in paddy soils are unknown. Hence, we mimicked paddy soil development in the laboratory by exposing two soil types with contrasting mineral assemblages (Alisol and Andosol) to eight anoxic-oxic cycles over 1year. Soils regularly received C-13-labeled rice straw. As control we used a second set of samples without straw addition as well as samples under static oxic conditions with and without straw. Headspaces were analyzed for carbon dioxide and methane as well as their C-13 signatures, whereas soil solutions were analyzed for redox potential, pH, dissolved iron, and dissolved organic carbon (DOC and (DOC)-C-13). At the end of the experiment, when eight redox cycles were completed, mineral-associated organic matter (MOM) was isolated by density fractionation and characterized for C-13, non-cellulosic carbohydrates, and lignin-derived phenols. Moreover, changes in the soil's microbial community structure were measured. For both soil types, headspace data confirmed less respiration in straw-amended soils with redox fluctuation than in those under static oxic conditions. The C-13 data revealed that, irrespective of soil type, straw carbon allocation into MOM was larger in soils with redox fluctuation than in those with static oxic conditions. A net increase in MOM after the one-year incubation, however, was only observed in the respective Andosol, probably due to abundant reactive minerals capable of OC uptake. In the Alisol, straw OC most likely exchanged initial MOM. A potential for lignin accumulation in the MOM of soils incubated with straw and redox fluctuation was observed for both soil types. Lignin and carbohydrates suggest a plant origin of MOM formed under redox fluctuation. The initially similar bacterial community composition of the Alisol and Andosol changed differently under redox fluctuation. The stronger change in the Alisol indicates less protective microbial habitats. In summary, the overall turnover of straw OC in soils under redox fluctuation seems to be independent of soil type, while net accumulation of SOC as well as the evolution of the bacterial community structure may in part depend on soil type, suggesting an impact of the soil's mineral composition.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Microbial Community ; Mineral-associated Organic Matter ; Mineralization ; Paddy Soils ; Redox Fluctuation ; Soil Organic Matter Formation; Long-term Fertilization; Stable-isotope Analysis; Combustion Based System; Tetraether Lipids; Paddy Soil; Matter Accumulation; Iron-oxides; Lignin; Biodegradation; Decomposition
ISSN (print) / ISBN
0168-2563
e-ISSN
1573-515X
Journal
Biogeochemistry
Quellenangaben
Volume: 143,
Issue: 1,
Pages: 31-54
Publisher
Springer
Publishing Place
Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Comparative Microbiome Analysis (COMI)