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Publication Type J
Authors Kenkel, N. C., A. L. McIlraith, C. A. Burchill and G. Jones
Title Competition and the Response of 3 Plant-Species to a Salinity Gradient
Source Canadian Journal of Botany-Revue Canadienne De Botanique
Author Keywords halophyte; glycophyte; community; hordeum-jubatum; puccinellia-nuttalliana; poa-pratensis salt-marsh; nutrient gradient; hordeum-jubatum; growth; communities; germination; halophyte
Abstract Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture at each of eight salinity levels in a controlled environment chamber. In monoculture, all species grew best when no salts were added to the nutrient medium. When salts were added the species showed differing degrees of salt tolerance. Percent decreases in total biomass with increasing salinity and shifts in aboveground to belowground biomass ratios suggested increased salt tolerance in the order P. pratensis < H. jubatum < P. nuttalliana. In mixture, all species showed a significant change in salinity response when compared with their responses in monoculture. Interspecific competition resulted in P. pratensis being suppressed at all but the lowest salinities. Hordeum jubatum showed the least suppression at intermediate salinities, while P. nuttalliana was least suppressed at the highest salinities. These results indicate that interspecific competition results in a shift in the peak performance of more salt-tolerant species toward the high end of the salinity gradient. The species distributions in our experimental mixtures reflected those observed in the field, suggesting that competition plays an important role in structuring inland saline plant communities.
Author Address KENKEL, NC, UNIV MANITOBA,DEPT BOT,WINNIPEG R3T 2N2,MANITOBA,CANADA.
29-Character Source Abbreviation Can. J. Bot.-Rev. Can. Bot.
Publication Date Nov
Year Published 1991
Volume 69
Issue 11
Beginning Page 2497-2502
Unique Article Identifier ISI:A1991HA71000017
Plants associated with this reference

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