Electron donor capacity of reducing dissolved organic matter from crop residue decomposition as probed by chronoamperometry |
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Authors: | Ran Bi Tian Yuan Qin Lu Yong Yuan Shungui Zhou |
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Institution: | 1. Guangdong Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 51064, PR China;2. Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, PR China |
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Abstract: | Reducing dissolved organic matters (RDOMs) from the anaerobic decomposition of crop residue can greatly affect the physicochemical and biological properties of soils. Electrochemical methods that can effectively protect them from oxidation and rapidly obtain results, such as differential pulse voltammetry (DPV), have been applied to qualitatively analyzing properties of RDOMs. However, the donated amount of electrons from RDOMs as a capacity factor may be more crucial for evaluating their important roles. For the first time, matured chronoamperometry (CA) was applied to quantitatively determining the electron donor capacities of RDOMs in crop residue management. The electron donor capacities of RDOMs from green manure were much higher than those from rice straw, which indicated that the former had greater effect on the redox status and reactions of soil. Chronoamperometry was proposed as a practical and effective method to quantitatively characterize RDOMs from residue decomposition. |
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Keywords: | Residue management Anaerobic decomposition Reducing dissolved organic matter Electrochemical characteristics Chronoamperometry |
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