Natural 15N abundance of presumed N2-fixing and non-N2-fixing plants from selected ecosystems

The 15N/14N ratios of plant and soil samples from Northern California ecosystems were determined by mass spectrometry. The 15N abundance of 176 plant foliar samples averaged 0.0008 atom % 15N excess relative to atmospheric N2 and ranged from-0.0028 to 0.0064 atom % 15N excess relative to atmospheric N2. Foliage from reported N2-fixing species had… (More)

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