Symbiotic N2-fixation in alpine tundra: ecosystem input and variation in fixation rates among communities

  title={Symbiotic N2-fixation in alpine tundra: ecosystem input and variation in fixation rates among communities},
  author={William D Bowman and James C. Schardt and Steven W. Schmidt},
Annual inputs of symbiotic N2-fixation associated with 3 species of alpine Trifolium were estimated in four alpine communities differing in resource supplies. We hypothesized that fixation rates would vary according to the degree of N, P, and water limitation of production, with the higher rates of fixation in N limited communities (dry meadow, moist meadow) and lower rates in P and water limited communities (wet meadow, fellfield). To estimate N2-fixation rates, natural abundance of N isotopes… CONTINUE READING
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