Abiotic reaction of nitrite with dissolved organic carbon? Testing the Ferrous Wheel Hypothesis

作者：Schmidt Bettina H M^*; Matzner Egbert

来源：Biogeochemistry, 2009, 93(3): 291-296.

DOI：10.1007/s10533-009-9290-3

• Abiotic nitrite immobilization
• Dissolved organic carbon
• Dissolved organic nitrogen
• Ferrous Wheel Hypothesis

The Ferrous Wheel Hypothesis (Davidson et al. 2003) postulates the abiotic formation of dissolved organic N (DON) in forest floors, by the fast reaction of NO(2) (-) with dissolved organic C (DOC). We investigated the abiotic reaction of NO(2) (-) with dissolved organic matter extracted from six different forest floors under oxic conditions. Solutions differed in DOC concentrations (15-60 mg L(-1)), NO(2) (-) concentrations (0, 2, 20 mg NO(2) (-)-N L(-1)) and DOC/DON ratio (13.4-25.4). Concentrations of added NO(2) (-) never decreased within 60 min, therefore, no DON formation from added NO(2) (-) took place in any of the samples. Our results suggest that the reaction of NO(2) (-) with natural DOC in forest floors is rather unlikely.

• 出版日期2009-4