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• W2317293668 startingPage "139" @default.
• W2317293668 abstract "Abstract: Not much is known about the nitrogen (N) uptake capacity and N-form preference of tropical trees. In a replicated labelling experiment with 15 N-ammonium, 15 N-nitrate and dual-labelled glycine applied to saplings of six tree species from southern Ecuadorian montane forests, we tested the hypotheses that (1) the saplings of tropical trees are capable of using organic N even though they are forming arbuscular mycorrhizas, and (2) with increasing altitude, tree saplings increasingly prefer ammonium and glycine over nitrate due to reduced nitrification and growing humus accumulation. Three- to 5-y-old saplings of two species each from 1000, 2000 and 3000 m asl were grown in pots inside the forest at their origin and labelled with non-fertilizing amounts of the three N forms; 15 N enrichment was detected 5 days after labelling in fine roots, coarse roots, shoots and leaves. The six species differed with respect to their N-form preference, but neither the abundance of ammonium and nitrate in the soil nor altitude (1000–3000 m asl) seemed to influence the preference. Two species (those with highest growth rate) preferred NH 4 + over NO 3 − , while the other four species took up NO 3 − and NH 4 + at similar rates when both N forms were equally available. After 13 C-glycine addition, 13 C was significantly accumulated in the biomass of three species (all species with exclusively AM symbionts) but a convincing proof of the uptake of intact glycine molecules by these tropical montane forest trees was not obtained." @default.
• W2317293668 created "2016-06-24" @default.
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• W2317293668 date "2014-11-26" @default.
• W2317293668 modified "2023-10-17" @default.
• W2317293668 title "Ammonium, nitrate and glycine uptake of six Ecuadorian tropical montane forest tree species: an<i>in situ</i>pot experiment with saplings" @default.
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• W2317293668 doi "https://doi.org/10.1017/s0266467414000650" @default.
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