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A model of nitrogen uptake by Eriophorum vaginatum roots in the field: ecological implications



A model of nitrogen uptake by Eriophorum vaginatum roots in the field: ecological implications



Ecological Monographs 67(1): 1-22



The factors that regulate the uptake of ammonium, glycine, and nitrate in the arctic sedge Eriophorum vaginatum were determined using a model of nutrient uptake. The simulations showed that all 3 organic forms of nitrogen could potentially make significant contributions to the N nutrition of E. vaginatum. Although the relative contribution of glycine was difficult to assess, glycine and ammonium contributed in approximately equal proportions for most model parameterizations. The importance of factors that controlled modeled ammonium and glycine uptake was ranked as follows: supply rate > [soil factors (buffer capacity and diffusion coefficient) = root density] > root uptake kinetics. The supply rate was the only variable that controlled nitrate uptake.

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Accession: 002738655

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DOI: 10.2307/2963502



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