Nitrous oxide emissions from stems of ash (Fraxinus angustifolia Vahl) and European beech (Fagus sylvatica L.)

Eugenio Díaz-Pinés*, Paloma Heras, Rainer Gasche, Agustín Rubio, Heinz Rennenberg, Klaus Butterbach-Bahl, Ralf Kiese

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Aims: We investigated N2O emissions from stems of Fraxinus angustifolia and Fagus sylvatica, hypothesizing that trees emit N2O through the stem via diffusion out of the transpiration stream. Methods: We used static chambers fixed at different heights of the stem to estimate N2O stem effluxes. Chambers were also used for monitoring soil N2O emissions. To stimulate soil N2O production and stem N2O emissions we fertilized the soil. Results: Before soil fertilization, stem N2O emissions were at most 2 μg N2O-N m−2 bark h−1. After fertilization, stem and soil emissions were linearly correlated; stem emissions decreased linearly with increasing height. Stems of Fagus sylvatica emitted up to 80 μg N2O-N m−2 bark h−1 at 20 cm above soil level; at 200 cm, stem N2O emissions were below detection limit. Fraxinus angustifolia stem N2O emissions reached 35 μg N2O-N m−2 bark h−1 after soil fertilization. Conclusions: Stem N2O emissions in upland trees occur even without aerenchyma, associated with xylem water transport. However, stem N2O emissions represented only 1–3 % of total (soil + stem) N2O emissions at the forest level. If this holds for other forest ecosystems, stem N2O emissions would be a minor pathway of N2O loss from terrestrial ecosystems into the atmosphere.

Original languageEnglish
Pages (from-to)35-45
Number of pages11
JournalPlant and Soil
Volume398
Issue number1-2
Early online date15 Aug 2015
DOIs
Publication statusPrint publication - 1 Jan 2016
Externally publishedYes

Bibliographical note

© Springer International Publishing Switzerland 2015

Keywords

  • Fagus sylvatica L
  • Fraxinus angustifolia Vahl
  • Soil N2O emissions
  • Tree stem N2O emissions

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