Seasonal Variations in the Isotopic Composition of Methane Associated with Aquatic Macrophytes
作者： Jeffrey P. Chanton , Lesley K. Smith
DOI: 10.1007/978-1-4615-2812-8_34
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摘要: Samples of methane bubbles were collected from sediments populated by emergent aquatic macrophytes during the early rising water period on Amazon River floodplain. Methane δ13C was distinctly lighter (-61.3 ± 0.3‰, n = 3) in stirred rooted C-3 plant Oryza perinnis than it containing C-4 plants Paspalum repens S (-52.0± 1.1‰, 6) or Echinochloa polystachya (-48.3± 0.2‰, 4). Leaf carbon δ 13C -28.2‰ and -11.4‰ Paspalum. In August, just after peak flood stage river, Paspalum, now a detached floating mat, sampled again. trapped within meadow had an isotopic composition -43.5 0.1‰(n 3), suggesting increase importance microbial oxidation as progressed through their annual life cycle to meadow. The these may be partly responsible for observed 10‰ seasonal variation emitted Central
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