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Wittich, B.; Homeier, J. &amp; Leuschner, C. (2014): <b>Ammonium, nitrate and glycine uptake of six Ecuadorian tropical montane forest tree species: an in situ pot experiment with saplings</b>. <i>Journal of Tropical Ecology</i> <b>xx</b>, xx.

Resource Description

Title: Ammonium, nitrate and glycine uptake of six Ecuadorian tropical montane forest tree species: an in situ pot experiment with saplings
FOR816dw ID: 1312
Publication Date: 2014-12-01
License and Usage Rights: PAK 823-825 data user agreement. (www.tropicalmountainforest.org/dataagreementp3.do)
Resource Owner(s):
Individual: Bärbel Wittich
Contact:
Individual: Jürgen Homeier
Contact:
Individual: Christoph Leuschner
Contact:
Abstract:
Not much is known about the nitrogen (N) uptake capacity and N-form preference of tropical trees. In a<br/> replicated labelling experiment with 15N-ammonium, 15N-nitrate and dual-labelled glycine applied to saplings of six<br/> tree species from southern Ecuadorianmontane forests, we tested the hypotheses that (1) the saplings of tropical trees<br/> are capable of using organicNeven though they are forming arbuscularmycorrhizas, and (2) with increasing altitude,<br/> tree saplings increasingly prefer ammonium and glycine over nitrate due to reduced nitrification and growing humus<br/> accumulation. Three- to 5-y-old saplings of two species each from 1000, 2000 and 3000 m asl were grown in pots<br/> inside the forest at their origin and labelled with non-fertilizing amounts of the three N forms; 15N enrichment was<br/> detected 5 days after labelling in fine roots, coarse roots, shoots and leaves. The six species differed with respect to<br/> their N-form preference, but neither the abundance of ammonium and nitrate in the soil nor altitude (1000–3000<br/> m asl) seemed to influence the preference. Two species (those with highest growth rate) preferred NH4+ over NO3?,<br/> while the other four species took up NO3? and NH4+ at similar rates when both N forms were equally available. After<br/> 13C-glycine addition, 13C was significantly accumulated in the biomass of three species (all species with exclusively<br/> AM symbionts) but a convincing proof of the uptake of intact glycine molecules by these tropical montane forest trees<br/> was not obtained.
Keywords:
| nitrogen | nitrate | ammonium | altitudinal gradient | 15N tracer study |
Literature type specific fields:
ARTICLE
Journal: Journal of Tropical Ecology
Volume: xx
Page Range: xx
Metadata Provider:
Individual: Jürgen Homeier
Contact:
Online Distribution:
Download File: http://www.lcrs.de/publications.do?citid=1312


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