Plant and Soil

, Volume 109, Issue 2, pp 207–213 | Cite as

N2(C2H2−C2H4) fixation in two species of Ceanothus seedlings in second year postfire chaparral

  • B. A. Ellis
  • J. Kummerow
Article

Abstract

Nitrogen fixation in excised root nodules of 2-year-old, postfireCeanothus tomentosus andC. leucodermis seedlings was measured over an 8-month period using the acetylene reduction method. High levels of NO3−N and NH4−N present in postfire soils were limited to the upper 10 cm and did not inhibit nodulation in these deeper-rooting seedlings. Decreases in acetylene reduction activity occurred with decreased soil moisture and increased soil temperature. Nitrogen gains from these two Ceanothus shrub seedlings totalled 1.6 kg N ha−1 yr−1.

Key words

Ceanothus chaparral nitrogen fixation 

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • B. A. Ellis
    • 1
  • J. Kummerow
    • 1
  1. 1.San Diego State UniversitySan DiegoUSA

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