eprintid: 451
rev_number: 12
eprint_status: archive
userid: 1
dir: disk0/00/00/04/51
datestamp: 2010-11-20 21:52:47
lastmod: 2017-01-13 20:39:24
status_changed: 2010-11-20 21:52:47
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Mayland, H.F.
creators_name: McIntosh, T.H.
creators_name: Fuller, W.H.
title: Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms
ispublished: pub
subjects: soiche_nitr
subjects: autoclass
divisions: d_unclass
abstract: Semiarid desert algal crust organisms were found to fix N2
when exposed to an atomosphere which contained isotopically
enriched N. Significant quantities of the N isotope were detected
in the total crust N after 3 days of incubation under field-simulated
conditions.

Net N2 fixation rates by the algal crust organisms were 0.16
and 0.10 lb of N/acre of crust surface per day under continuous
wet and cycling wet-dry conditions, respectively. Net fixation of
N under field-simulated conditions adequately compensated for
the removal of N by livestock. The rate of N2 fixation under
field-simulated conditions increased linearly for at least 520 days.
The amount of N in the algal crust was doubled during this time.
No net N change was observed in dry crusts.

Growing algal crusts contained 1% to 2% of the total N as
extracellular NH4-N. Excretion of some fixed nitrogen was
suggested by the isotopic enrichment of the extracellular N fraction
and uptake of labeled N by grass seedlings (Artemesia sp.)
growing on incubated crusts.
date: 1966
date_type: published
id_number: 0056
full_text_status: public
publication: Soil Science Society of America Proceedings
volume: 30
number: 1
pagerange: 56-60
refereed: unknown
citation:   Mayland, H.F. and McIntosh, T.H. and Fuller, W.H.  (1966) Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms.   Soil Science Society of America Proceedings.      30(1):56-60.               
document_url: https://eprints.nwisrl.ars.usda.gov/id/eprint/451/1/56.pdf