[1] Blodau C. Carbon cycling in peatlands? A review of processes and controls. Environmental Reviews, 2002, 10: 111-134 [2] Gao C, Sander M, Agethen S, et al. Electron accepting capacity of dissolved and particulate organic matter control CO2 and CH4 formation in peat soils. Geochimica et Cosmochimica Acta, 2019, 245: 266-277 [3] Andreetta A, Huertas AD, Lotti M, et al. Land use changes affecting soil organic carbon storage along a mangrove swamp rice chronosequence in the Cacheu and Oio regions (northern Guinea-Bissau). Agriculture, Ecosystems & Environment, 2016, 216: 314-321 [4] Limpens J, Berendse F, Blodau C, et al. Peatlands and the carbon cycle: From local processes to global implications: A synthesis. Biogeosciences, 2008, 5: 1475-1491 [5] Lovley DR. Dissimilatory Fe(Ⅲ) and Mn(Ⅳ) reduction. Microbiological Reviews, 1991, 55: 259-287 [6] Lovley DR, Dwyer DF, Klug MJ. Kinetic analysis of competition between sulfate reducers and methanogens for hydrogen in sediments. Applied & Environmental Microbiology, 1982, 43: 1373-1379 [7] Klüber HD, Conrad R. Effects of nitrate, nitrite, NO and N2O on methanogenesis and other redox processes in anoxic rice field soil. FEMS Microbiology Ecology, 1998, 25: 301-318 [8] Yu ZG, Goettlicher J, Steininger R, et al. Organic sulfur and organic matter redox processes contribute to electron flow in anoxic incubations of peat. Environmental Chemistry, 2016, 13: 816-825 [9] Achtnich C, Bak F, Conrad R. Competition for electron donors among nitrate reducers, ferric iron reducers, sulfate reducers and methanogens in anoxic paddy soil. Biology and Fertility of Soils, 1995, 19: 65-72 [10] Heitmann T, Goldhammer T, Beer J, et al. Electron transfer of dissolved organic matter and its potential significance for anaerobic respiration in a northern bog. Global Change Biology, 2010, 13: 1771-1785 [11] Lovley DR, Coates JD, Blunt-Harris EL, et al. Humic substances as electron acceptors for microbial respiration. Nature, 1996, 382: 445-448 [12] Heitmann T, Blodau C. Oxidation and incorporation of hydrogen sulfide by dissolved organic matter. Chemical Geology, 2006, 235: 12-20 [13] Aeschbacher M, Graf C, Schwarzenbach RP, et al. Antioxidant properties of humic substances. Environmental Science & Technology, 2012, 46: 4916-4925 [14] Klüpfel L, Piepenbrock A, Kappler A, et al. Humic substances as fully regenerable electron acceptors in recurrently anoxic environments. Nature Geoscience, 2014, 7: 195-200 [15] Walpen N, Getzinger GJ, Schroth MH, et al. Electron-donating phenolic and electron-accepting quinone moieties in peat dissolved organic matter: Quantities and redox transformations in the context of peat biogeoche-mistry. Environmental Science & Technology, 2018, 52: 5236-5245 [16] Strohmeier S, Knorr KH, Reichert M, et al. Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: Insights from high frequency measurements. Biogeosciences, 2013, 10: 905-916 [17] Knorr KH. DOC-dynamics in a small headwater catchment as driven by redox fluctuations and hydrological flow paths: Are DOC exports mediated by iron reduction/oxidation cycles. Biogeosciences, 2013, 10: 891-904 [18] Yu Z, Peiffer S, Goettlicher J. Electron transfer budgets and kinetics of abiotic oxidation and incorporation of aqueous sulfide by dissolved organic matter. Environmental Science & Technology, 2015, 49: 5441-5449 [19] Yu Z, Orsetti S, Haderlein SB, et al. Electron transfer between sulfide and humic acid: Electrochemical evalua-tion of the reactivity of sigma-aldrich humic acid toward sulfide. Aquatic Geochemistry, 2016, 22: 117-130 [20] Lau MP, Sander M, Gelbrecht J, et al. Solid phases as important electron acceptors in freshwater organic sediments. Biogeochemistry, 2015, 123: 49-61 [21] Frei S, Lischeid G, Fleckenstein JH. Effects of micro-topography on surface-subsurface exchange and runoff generation in a virtual riparian wetland: A modeling study. Advances in Water Resources, 2010, 33: 1388-1401 [22] Gerstberger P, Foken T, Kalbitz K. The Lehstenbach and Steinkreuz Catchments in NE Bavaria Germany// Matzner E, ed. Biogeochemistry of Forested Catchments in a Changing Environment. Berlin, Germany: Sprin-ger, 2004: 15-41 [23] Baumann K. Development of the Moorvegetation in the Harz National Park, Band 4. Wernigerode, Germany: Harz National Park Administration, 2009 [24] Broder T, Knorr KH, Biester H. Changes in dissolved organic matter quality in a peatland and forest headwater stream as a function of seasonality and hydrologic conditions. Hydrology & Earth System Sciences, 2017, 21: 2035-2051 [25] Broder T, Blodau C, Biester H, et al. Peat decomposition records in three pristine ombrotrophic bogs in sou-thern Patagonia. Biogeosciences, 2012, 9: 1479-1491 [26] Tamura H, Goto K, Yotsuyanagi T, et al. Spectrophotometric determination of iron (Ⅱ) with 1,10-phenanthroline in the presence of large amounts of iron (Ⅲ). Talanta, 1974, 21: 314-318 [27] Aeschbacher M, Sander M, Schwarzenbach RP. Novel electrochemical approach to assess the redox properties of humic substances. Environmental Science & Techno-logy, 2010, 44: 87-93 [28] Klüpfel L, Keiluweit M, Kleber M, et al. Redox properties of plant biomass-derived black carbon (biochar). Environmental Science & Technology, 2014, 48: 5601-5611 [29] Lischeid G, Bittersohl J. Tracing biogeochemical processes in stream water and groundwater using non-linear statistics. Journal of Hydrology, 2008, 357: 11-28 [30] Lischeid G, Lange H, Moritz K, et al. Dynamics of runoff and runoff chemistry at the Lehstenbach and Steinkreuz Catchment. Ecological Studies, 2004, 172: 399-436 [31] Goldberg SD, Knorr KH, Gebauer G. N2O concentration and isotope signature along profiles provide deeper insight into the fate of N2O in soils. Isotopes in Environmental and Health Studies, 2009, 44: 377-391 [32] Clemens C. Biogeochemical Characteristic of the Reconstruction Hangmoores in Fichtelgebirge. Master Thesis. Bayreuth, Germany: University of Bayreuth, 2011 [33] Knorr KH, Lischeid G, Blodau C. Dynamics of redox processes in a minerotrophic fen exposed to a water table manipulation. Geoderma, 2009, 153: 390-392 [34] Aeschbacher M, Vergari D, Schwarzenbach RP, et al. Electrochemical analysis of proton and electron transfer equilibria of the reducible moieties in humic acids. Environmental Science & Technology, 2011, 45: 8385-8394 [35] Blodau C, Mayer B, Peiffer S, et al. Support for an anaerobic sulfur cycle in two Canadian peatland soils. Journal of Geophysical Research Biogeoences, 2007, 112: 112-123 [36] Nielsen LP, Risgaard-Petersen N, Fossing H, et al. Electric currents couple spatially separated biogeochemical processes in marine sediment. Nature, 2010, 463: 1071-1074 [37] Keller JK, Bridgham S. Pathways of anaerobic carbon cycling across an ombrotrophic-minerotrophic peatland gradient. Limnology & Oceanography, 2007, 52: 96-107 [38] Tang ZR, Huang CH, Tan WB, et al. Electron transfer capacities of dissolved organic matter derived from swine manure based on eletrochemical method. Chinese Journal of Analytical Chemistry, 2018, 46: 422-430 [39] Valenzuela EI, Avendaño KA, Balagurusamy N, et al. Electron shuttling mediated by humic substances fuels anaerobic methane oxidation and carbon burial in wetland sediments. Science of the Total Environment, 2019, 650: 2674-2684 |