Ferrous Iron Stimulates Phenol Oxidase Activity and Organic Matter Decomposition in Waterlogged Wetlands |
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Authors: | Email author" target="_blank">Peter?M?Van?BodegomEmail author Rob?Broekman Jerry?Van?Dijk Chris?Bakker Rien?Aerts |
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Institution: | (1) Department of Systems Ecology, Institute of Ecological Science, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;(2) Department of Ecology and Physiology of Plants, Institute of Ecological Science, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands |
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Abstract: | Soil organic matter decomposition is limited at waterlogged conditions by the low activity of extracellular enzymes like phenol
oxidases. In this paper, we show that ferrous iron (Fe2+), which is abundant in waterlogged soils, significantly stimulates phenol oxidase activity both in pure enzyme assays and
in waterlogged soil slurries from nutrient-poor dune slacks. However, the effects in soil slurries were less strong than in
enzyme assays. Both the addition of Fe2+ and the initial presence of Fe2+ stimulated phenol oxidase activity at the microaerophilic conditions tested. This stimulation is attributed to the catalysis
of additional OH radical production, promoting the oxidation of phenolics. Subsequently, the presence of Fe2+ strongly increased total decomposition rates of soil organic matter, measured as CO2 production and Cotton strip Tensile Strength Loss. There is circumstantial evidence that this stimulation by Fe2+ could be important for decomposition in wetlands at field conditions, but its relevance compared to the effects of other
compounds still needs to be elucidated. These results emphasise the crucial role of water quality in determining extracellular
enzyme activity and decomposition in waterlogged wetlands. |
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Keywords: | Anaerobic mineralisation CO2 production Phenolics Reduced iron Soil organic matter |
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