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ATMOSPHERIC NITROGEN
1
BIOLOGICAL NITROGEN-FIXATION
1
CARBON-ISOTOPE DISCRIMINATION
1
COMMUNITY COMPOSITION
1
DINITROGEN FIXATION
1
EXPERIMENTAL WARMING ALTERS
LITTER DECOMPOSITION
1
N-15 NATURAL-ABUNDANCE
1
SEASONAL-VARIATION
1
SUB-ARCTIC BRYOPHYTE
1
acetylene reduction assay
1
delta C-13
1
delta N-15
1
mosses
1
nitrogen cycling
1
subarctic tundra ecosystems
1
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