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Media type:
E-Article
Title:
15N Natural Abundance as a Possible Marker of the Ectomycorrhizal Habit of Trees in Mixed African Woodlands
Contributor:
Hogberg, Peter
imprint:
Cambridge University Press, 1990
Published in:The New Phytologist
Language:
English
ISSN:
0028-646X;
1469-8137
Origination:
Footnote:
Description:
<p>The partial contribution by fixed nitrogen in N<sub>2</sub>-fixing plants can be estimated if the<sup>15</sup>N natural abundance of non-N<sub>2</sub>-fixing reference species, which derive their N from the soil, deviates from that of atmospheric N<sub>2</sub>(the<sup>15</sup>N natural abundance method). Data from Tanzanian miombo woodland showed a significant difference (= 1.0-2.5 δ<sup>15</sup>Npermil) in<sup>15</sup>N abundance between ectomycorrhizal and vesicular-arbuscular (VA) mycorrhizal reference species. This finding casts doubt upon arbitrary selection of reference species, and also raises the possibility of using<sup>15</sup>N abundance as a marker of the ectomycorrhizal habit. It is suggested that the higher<sup>15</sup>N abundance of ectomycorrhizal tree species could result from differences in discrimination during uptake or from greater utilization of organic N.</p>