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EFFECTS OF O 2 ON AMMONIUM UPTAKE AND ROOT RESPIRATION BY SPARTINA ALTERNIFLORA
Author(s) -
Morris James T.,
Dacey John W. H.
Publication year - 1984
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1984.tb14164.x
Subject(s) - spartina alterniflora , rhizosphere , respiration , ammonium , biology , anaerobic exercise , nitrogen , botany , anaerobic respiration , ecology , chemistry , physiology , wetland , genetics , marsh , organic chemistry , bacteria
Previously the growth of Spartina alterniflora has been found to be limited by nitrogen and correlated with sediment redox potential. In this study we have investigated a possible connection between these two factors. We have found that internal O 2 transport is insufficient to saturate NH 4 + uptake in short S. alterniflora in hydroponic culture. Rates of NH 4 + uptake and root respiration were very sensitive to O 2 concentration in the rhizosphere, saturating at about 5% O 2 . Ammonium uptake continued at a reduced rate for at least 4 hr under anaerobic conditions. Plant to plant variations in anaerobic rates of NH 4 + uptake and root respiration were significantly correlated to the diffusion rate of CH 4 tracer gas from the leaves to the roots of individual plants.