, Volume 79, Issue 4, pp 566–568

Nitrogen fixation in the lichen Lobaria pulmonaria in elevated atmospheric carbon dioxide

  • Richard J. Norby
  • Lorene L. Sigal
Short Communications

DOI: 10.1007/BF00378677

Cite this article as:
Norby, R.J. & Sigal, L.L. Oecologia (1989) 79: 566. doi:10.1007/BF00378677


Thalli of Lobaria pulmonaria (L.) Hoffm., a nitrogen-fixing epiphyte common in mesic temperate forests, were collected in a Douglas-fir (Pseudotsuga menziesii Franco) forest near Corvallis, Oregon, and maintained for 20 to 40 days in controlled-environment chambers with atmospheric CO2 concentrations of 374 and 700 μll-1. Nitrogenase activity, which was assayed by the acetylene reduction method, was approximately doubled in the lichen maintained in elevated CO2. Increases in nitrogen fixation by lichens may be an important part of the integrated ecosystem response to rising CO2.

Key words

Carbon dioxideLichenLobariaNitrogen fixation

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Richard J. Norby
    • 1
  • Lorene L. Sigal
    • 1
  1. 1.Environmental Sciences DivisionOak Ridge National LaboratoryOak RidgeUSA