title: Electron donor capacity of reducing dissolved organic matter from crop residue decomposition as probed by chronoamperometry.
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.
authors.affiliation: Guangdong Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 51064, PR China; Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, PR China.
authors.forename: Ran
authors.initials: R
authors.lastname: Bi
authors.forename: Tian
authors.initials: T
authors.lastname: Yuan
authors.forename: Qin
authors.initials: Q
authors.lastname: Lu
authors.forename: Yong
authors.initials: Y
authors.lastname: Yuan
authors.forename: Shungui
authors.initials: S
authors.lastname: Zhou
mesh_terms: D018556:Crops, Agricultural / Q000737:chemistry*; D004583:Electrons; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil
keywords: Anaerobic decomposition; Chronoamperometry; Electrochemical characteristics; Reducing dissolved organic matter; Residue management