Plant and Soil

, Volume 398, Issue 1–2, pp 35–45 | Cite as

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
Regular Article

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.

Keywords

Tree stem N2O emissions Soil N2O emissions Fagus sylvaticaFraxinus angustifolia Vahl 

Notes

Acknowledgments

This work has received funding from the European Community’s Seventh Framework Program, under project number 262060 (ExpeER) within its framework of Transnational Access Activity (subproject FLUSTTREE).

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Eugenio Díaz-Pinés
    • 1
  • Paloma Heras
    • 1
    • 2
    • 3
  • Rainer Gasche
    • 1
  • Agustín Rubio
    • 2
  • Heinz Rennenberg
    • 4
    • 5
  • Klaus Butterbach-Bahl
    • 1
    • 6
  • Ralf Kiese
    • 1
  1. 1.Institute of Meteorology and Climate ResearchKarlsruhe Institute of TechnologyGarmisch-PartenkirchenGermany
  2. 2.Department of Natural Systems and ResourcesTechnical University of Madrid, School of Forestry Engineering and Natural ResourcesMadridSpain
  3. 3.Crop & Soils SystemsSRUC Edinburgh CampusEdinburghUK
  4. 4.Institute of Forest SciencesUniversity of FreiburgFreiburgGermany
  5. 5.College of ScienceKing Saud UniversityRiyadhSaudi Arabia
  6. 6.International Livestock Research InstituteNairobiKenya

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