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stable isotopes(4)
cyanobacteria(2)
nitrogen(2)
nitrogen cycle(2)
nitrogen deposition(2)
nitrogen fixation(2)
13c(1)
15n isotope(1)
acetylene reduction(1)
acid deposition(1)
alternative nitrogenase(1)
amino acid stable isotopes(1)
ammonification(1)
arctic(1)
assimilation(1)
atmospheric inputs(1)
bryophytes(1)
calcium(1)
carbon(1)
carbon mineralization(1)
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