Alpine plants show species-level differences in the uptake of organic and inorganic nitrogen |
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Authors: | Miller Amy E Bowman William D |
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Institution: | (1) Mountain Research Station, Institute of Arctic and Alpine Research, USA;(2) Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder, CO 80309-0334, USA;(3) Biological Sciences, Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA |
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Abstract: | As an estimate of species-level differences in the capacity to take up different forms of N, we measured plant uptake of 15N-NH4
+, 15N-NO3
– and 15N, 1]-13C glycine within a set of herbaceous species collected from three alpine community types. Plants grown from cuttings in the greenhouse showed similar growth responses to the three forms of N but varied in the capacity to take up NH4
+, NO3
– and glycine. Glycine uptake ranged from approximately 42% to greater than 100% of NH4
+ uptake; however, four out of nine species showed significantly greater uptake of either NH4
+ or NO3
– than of glycine. Relative concentrations of exchangeable N at the sites of plant collection did not correspond with patterns of N uptake among species; instead, species from the same community varied widely in the capacity to take up NH4
+, NO3
–, and glycine, suggesting the potential for differentiation among species in resource (N) use. |
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Keywords: | ammonium glycine nitrate |
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