Does an ‘iron gate’ carbon preservation mechanism exist in organic–rich wetlands?
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2019-08-01
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© 2019 Recent research suggested that iron oxidation may protect carbon from drought-accelerated decomposition in wetlands by promoting the sorption of lignin derivatives and decreasing phenolic oxidase activities. Here we examined whether this mechanism exists in organic-rich peatlands, which store over 30% of the world's soil carbon, by simulating drought and flooded conditions in peat soil with and without the addition of reduced iron. Our results suggest that iron does not protect carbon from decomposition in organic-rich peatlands, and in fact iron may exacerbate carbon decomposition via precipitation of phenolic compounds, which otherwise have been shown to inhibit microbial activity. In addition, scanning electron microscopy analyses of different types of peat soil from Minnesota to Peru showed evidence of iron-sulfide minerals (pyrite), indicating that some portion of the reduced iron in peatlands is effectively immobilized and therefore does not interact with the carbon cycle.
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Wang, H, M River and CJ Richardson (2019). Does an ‘iron gate’ carbon preservation mechanism exist in organic–rich wetlands?. Soil Biology and Biochemistry, 135. pp. 48–50. 10.1016/j.soilbio.2019.04.011 Retrieved from https://hdl.handle.net/10161/19061.
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Curtis J. Richardson
Curtis J. Richardson is Professor of Resource Ecology and founding Director of the Duke University Wetland Center in the Nicholas School of the Environment. Dr. Richardson earned his degrees from the State University of New York and the University of Tennessee.
His research interests in applied ecology focus on long-term ecosystem response to large-scale perturbations such as climate change, toxic materials, trace metals, flooding, or nutrient additions. He has specific interests in phosphorus nutrient dynamics in wetlands and the effects of environmental stress on plant communities and ecosystem functions and services. The objectives of his research are to utilize ecological principles to develop new approaches to environmental problem solving. The goal of his research is to provide predictive models and approaches to aid in the management of ecosystems. Recent research activities: 1) wetland restoration of plant communities and its effects on regional water quality and nutrient biogeochemical cycles, 2) the development of ecosystem metrics as indices of wetland restoration success, 3) the effects of nanomaterial on wetland and stream ecosystem processes, 4) the development of ecological thresholds along environmental gradients, 5) wetland development trends and restoration in coastal southeastern United States, 6) the development of an outdoor wetland and stream research and teaching laboratory on Duke Forest, 7) differential nutrient limitation (DNL) as a mechanism to overcome N or P limitations across trophic levels in wetland ecosystems, and 8) carbon sequestration in coastal North Carolina pocosins.Richardson oversees the main analytical lab in NSOE, which is open to students and faculty. Dr. Richardson has been listed in Who's Who in Science™ annually since 1989 and was elected President of the Society of Wetland Scientists in 1987-88. He has served on many editorial review committees for peer-reviewed scientific journals, and he is a past Chair of the Nicholas School Division of Environmental Sciences and Policy. Dr. Richardson is a Fellow of the American Association for the Advancement of Science, the Society of Wetland Scientists, and the Soil Science Society of America.
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