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Soil Science Society of America Journal Abstract -

Distribution of Nitrogen Fixed in Desert Algal-Crusts1

 

This article in SSSAJ

  1. Vol. 30 No. 5, p. 606-609
     
    Received: Jan 24, 1966
    Accepted: Apr 27, 1966


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doi:10.2136/sssaj1966.03615995003000050021x
  1. H. F. Mayland and
  2. T. H. McIntosh2

Abstract

Abstract

Fixation of isotopically labeled N2 by desert algal crust organisms was very rapid after initial wetting of crusts. After 8 days of incubation, a steady rate of fixation was reached which continued for 152 days.

The initial distribution of N was 4% extracellular NH4, 16% acid-hydrolyzable NH4 (included extracellular NH4), 41% α amino acid, 4% hexosamine, 29% acid-hydrolyzable but unidentified, and 11% non-hydrolyzable. After 21 days of incubation the distribution of total N was 2, 18, 42, 2, 29 and 11%, respectively. The distribution of excess N15 after 21 days of incubation was trace, 12, 51, 2, 29 and 7% for the respective fractions. Continued incubation had little effect on the relative distribution of N in the several fractions.

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