Stem injection of 15 N-NHNO into mature Sitka spruce (Picea sitchensis)
Nair, Richard (University of Edinburgh)
Weatherall, Andrew (National School of Forestry)
Perks, Mike (Northern Research Station, Forest Research)
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2014
Resum:	Stem injection techniques can be used to introduce 15 N into trees to overcome a low variation in natural abundance and label biomass with a distinct 15 N signature, but have tended to target small and young trees, of a variety of species, with little replication. We injected 98 atom% 15 N ammonium nitrate (NHNO) solution into 13 mature, 9- to 13-m tall edge-profile Sitka spruce trees in order to produce a large quantity of labelled litter, examining the distribution of the isotope throughout the canopy after felling in terms of both total abundance of 15 N and relative distribution of the isotope throughout individual trees. Using a simple mass balance of the canopy alone, based on observed total needle biomass and modelled branch biomass, all of the isotope injected was accounted for, evenly split between needles and branches, but with a high degree of variability both within individual trees, and among trees. Both 15 N abundance and relative within-canopy distribution were biased towards the upper and middle crown in foliage. Recovery of the label in branches was much more variable than in needles, possibly due to differences in nitrogen allocation for both growth and storage, which differ seasonally between foliage and woody biomass.
Nota:	Altres ajuts: This work was funded by the UK Natural Environment Research Council (NERC), grant NE/G00725 X/1 and Forestry Commission UK
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Canopy position ; Isotope labelling ; Labelled biomass ; Nitrogen allocation ; Nitrogen storage ; Xylem
Publicat a:	Tree Physiology, Vol. 34 (october 2014) , p. 1130-1140, ISSN 1758-4469

DOI: 10.1093/treephys/tpu084
PMID: 25335951

11 p, 1.5 MB

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