Dinitrogen fixation in alpine tundra, Niwot Ridge, Front Range, Colorado, USA.

Martin Wojciechowski, M. E. Heimbrook

Research output: Chapter in Book/Report/Conference proceedingChapter

22 Scopus citations


The highest overall acetylene reduction rates are found in the wet Caltha meadow and moist Salix shrub tundra sites (5.8-7.8 mu mol ethylene produced in m-2 h-1); lowest activities are found in the soils of the xeric sites, Kobresia meadow and fellfield tundras (0.13-0.33 mu mol ethylene m-2 h-1). Soil moisture is the primary environmental factor influencing in situ rates of acetylene reduction. Acetylene reduction activity was associated with the vascular plants Dryas octopetala ssp. hookeriana and Trifolium dasyphyllum (0.13-5.4 mu mol ethylene m-2 h-1), and the lichens Peltigera aphthosa and Stereocaulon alpinum (0.05-0.42 mu mol ethylene g-1 h-1). Low activity associated with the moss Pohlia is attributed to epiphytic cyanobacteria. The contribution of N by dinitrogen fixation, estimated to be 5 mg N m-2 annually, does not apparently constitute the major source of N input to this tundra system. - from Authors

Original languageEnglish (US)
Title of host publicationArctic & Alpine Research
Number of pages10
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)


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