Mobilization of colloidal carbon during iron reduction in basaltic soils

The transport of organic carbon (C) to deep mineral horizons in soils can lead to long-term C stabilization. In basaltic soils, C associations with short-range-ordered (SRO) minerals often lead to colloid-sized aggregates that can be dispersed and mobilized by changes in soil solution chemistry. In...

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Veröffentlicht in:	Geoderma 2014-06, Vol.221-222, p.139-145
Hauptverfasser:	Buettner, Shea W., Kramer, Marc G., Chadwick, Oliver A., Thompson, Aaron
Format:	Artikel
Sprache:	eng
Schlagworte:	Agronomy. Soil science and plant productions Anoxia Asymmetric flow field-flow fractionation Biological and medical sciences Carbon Colloids Earth sciences Earth, ocean, space Exact sciences and technology Fundamental and applied biological sciences. Psychology Hawaii Horizon Iron Iron reduction Minerals Reduction Slurries Soil organic matter Soils Surficial geology
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Zusammenfassung:	The transport of organic carbon (C) to deep mineral horizons in soils can lead to long-term C stabilization. In basaltic soils, C associations with short-range-ordered (SRO) minerals often lead to colloid-sized aggregates that can be dispersed and mobilized by changes in soil solution chemistry. In the montane forest region of Hawaii, basaltic soils are exposed to high rainfall and anoxic conditions that facilitate ferric (FeIII) (oxyhydr)oxide reduction. We explored the potential of iron (Fe)-reducing conditions to mobilize C by exposing the surface mineral horizons of three soils from the Island of Hawai'i (aged 0.3, 20, and 350ky) to 21days of anoxic incubation in 1:10 soil slurries. Mobilized C was quantified by fractionating the slurries into three particle-size classes (
ISSN:	0016-7061 1872-6259
DOI:	10.1016/j.geoderma.2014.01.012