Influence of iron redox cycling on organo-mineral associations in Arctic tundra soil
نویسندگان
چکیده
منابع مشابه
Biogeochemical cycling in an Arctic coastal tundra ecosystem
Introduction Conclusions References
متن کاملMicrobial iron-redox cycling in subsurface environments.
In addition to its central role in mediating electron-transfer reactions within all living cells, iron undergoes extracellular redox transformations linked to microbial energy generation through utilization of Fe(II) as a source of chemical energy or Fe(III) as an electron acceptor for anaerobic respiration. These processes permit microbial populations and communities to engage in cyclic couple...
متن کاملPulse-labeling studies of carbon cycling in arctic tundra ecosystems: Contribution of photosynthates to soil organic matter
[1] To increase our understanding of carbon (C) cycling and storage in soils, we used C to trace C from roots into four soil organic matter (SOM) fractions and the movement of soil microbes in arctic wet sedge and tussock tundra. For both tundra types, the proportion of C activity in the soil was 6% of the total C-CO2 taken up by plants at each of the four harvests conducted 1, 7, 21, and 68 da...
متن کاملRepeated anaerobic microbial redox cycling of iron.
Some nitrate- and Fe(III)-reducing microorganisms are capable of oxidizing Fe(II) with nitrate as the electron acceptor. This enzymatic pathway may facilitate the development of anaerobic microbial communities that take advantage of the energy available during Fe-N redox oscillations. We examined this phenomenon in synthetic Fe(III) oxide (nanocrystalline goethite) suspensions inoculated with m...
متن کاملOrgano-Mineral–Enzyme Interaction and Soil Enzyme Activity
Both microbially produced enzymes and mineral surfaces can be considered catalysts of chemical transformation in soils and other geological environments such as sediments and subsurface aquifers. While both are important direct agents of organic matter (OM) remineralization and transformation, mineral surfaces can also act as “heterogeneous co-catalysts,” influencing the kinetic properties of b...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2017
ISSN: 0016-7037
DOI: 10.1016/j.gca.2017.02.034