Dissolved organic carbon lability and stable isotope shifts during microbial decomposition in a tropical river system
作者： N. Geeraert , F. O. Omengo , G. Govers , S. Bouillon
关键词: Decomposition 、 Chemistry 、 Vegetation 、 Dissolved organic carbon 、 Stable isotope ratio 、 Drainage basin 、 Environmental chemistry 、 Carbon 、 δ13C 、 Lability
摘要: Abstract. A significant amount of carbon is transported to the ocean as dissolved organic (DOC) in rivers. During transport, it can be transformed through microbial consumption and photochemical oxidation. In dark incubation experiments with water from Tana River, Kenya, we examined DOC decomposition associated change its stable isotope composition (δ13C). 15 18 incubations, concentrations decreased significantly by 10 60 %, most taking place within first 24–48 h. After 8 days, remaining was up 3 ‰ more depleted 13C compared initial pool, δ13C correlated strongly fraction remaining. We hypothesize that shift consistent greater lability originating herbaceous C4 vegetation than derived woody C3 semi-arid lower Tana. The results complement earlier findings concentration riverine does not necessarily reflect proportion C4-derived catchment: besides spatial distribution patterns different types, processing river further influence OC.
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