Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i>
We aimed at quantifying biogenic volatile organic compound (BVOC) emissions in June from three Mediterranean species located at the O<sub>3</sub>HP site (southern France): <i>Quercus pubescens</i>, <i>Acer monspessulanum</i> and <i>C. coggygria</i> (...
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/431/2015/acp-15-431-2015.pdf |
| _version_ | 1811318461148692480 |
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| author | A.-C. Genard-Zielinski C. Boissard C. Fernandez C. Kalogridis J. Lathière V. Gros N. Bonnaire E. Ormeño |
| author_facet | A.-C. Genard-Zielinski C. Boissard C. Fernandez C. Kalogridis J. Lathière V. Gros N. Bonnaire E. Ormeño |
| author_sort | A.-C. Genard-Zielinski |
| collection | DOAJ |
| description | We aimed at quantifying biogenic volatile organic compound (BVOC) emissions
in June from three Mediterranean species located at the O<sub>3</sub>HP site
(southern France): <i>Quercus pubescens</i>, <i>Acer monspessulanum</i> and <i>C. coggygria</i> (for isoprene only). As <i>Q. pubescens</i> was shown to be the main
BVOC emitter with isoprene representing ≈ 99% of the carbon
emitted as BVOC, we mainly focused on this species. <i>C. coggygria</i> was found to be a
non-isoprene emitter (no other BVOCs were investigated).
<br></br>
To fully understand both the canopy effect on <i>Q. pubescens </i> isoprene emissions and the
inter-individual variability (tree to tree and within canopy), diurnal
variations of isoprene were investigated from nine branches (seven branches
located to the top of canopy at ≈ 4 m above ground level (a.g.l.), and
two inside the canopy at ≈ 2 m a.g.l.).
<br></br>
The <i>Q. pubescens</i> daily mean isoprene emission rate (ER<sub>d</sub>) fluctuated between
23 and 98 μgC g<sub>DM</sub><sup>−1</sup> h<sup>−1</sup>.
<i>Q. pubescens</i> daily mean net assimilation (Pn)
ranged between 5.4 and 13.8, and 2.8 and 6.4 μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup> for sunlit and shaded branches respectively. Both ER<sub>d</sub> and isoprene
emission factors (Is), assessed according to Guenther et al. (1993)
algorithm, varied by a factor of 4.3 among the sunlit branches. While sunlit
branches ER<sub>d</sub> was clearly higher than for shaded branches, there was a
non-significant variability of Is (59 to 77 μgC g<sub>DM</sub><sup>−1</sup> h<sup>−1</sup>). Diurnal variations of isoprene emission rates (ERs) for sunlit
branches were also investigated. ERs were detected at dawn 2 h after Pn became
positive and were mostly exponentially dependent on Pn. Diurnal
variations of ERs were not equally well described throughout the day by temperature
(C<sub>T</sub>) and light (C<sub>L</sub>) parameters according to G93 algorithm.
Temperature had more impact than photosynthetically active radiation (PAR) on the morning emissions increase, and
ER was no longer correlated to C<sub>L</sub> × C<sub>T</sub> between solar noon
(maximum ER) and mid-afternoon, possibly due to thermal stress of the plant. A
comparison between measured and calculated emissions using two isoprene
algorithms (G93 and MEGAN – Model of Emissions of Gases and Aerosols from Nature) highlighted the importance of isoprene emission
factor Is value used, and some weakness in assessing isoprene emissions
under Mediterranean climate conditions (drought) with current isoprene
models. |
| first_indexed | 2024-04-13T12:25:43Z |
| format | Article |
| id | doaj.art-f8df3c7c7d0945509510bdd95a9f6743 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T12:25:43Z |
| publishDate | 2015-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-f8df3c7c7d0945509510bdd95a9f67432022-12-22T02:47:02ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-01-0115143144610.5194/acp-15-431-2015Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i>A.-C. Genard-Zielinski0C. Boissard1C. Fernandez2C. Kalogridis3J. Lathière4V. Gros5N. Bonnaire6E. Ormeño7IMBE, Aix Marseille Université-CNRS-IRD-Univ. Avignon 3 Place Victor Hugo, 13331 Marseille CEDEX 3, FranceLaboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL), Unité Mixte CEA-CNRS-UVSQ (Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines), 91198 Gif-sur-Yvette, FranceIMBE, Aix Marseille Université-CNRS-IRD-Univ. Avignon 3 Place Victor Hugo, 13331 Marseille CEDEX 3, FranceLaboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL), Unité Mixte CEA-CNRS-UVSQ (Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines), 91198 Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL), Unité Mixte CEA-CNRS-UVSQ (Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines), 91198 Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL), Unité Mixte CEA-CNRS-UVSQ (Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines), 91198 Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL), Unité Mixte CEA-CNRS-UVSQ (Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines), 91198 Gif-sur-Yvette, FranceIMBE, Aix Marseille Université-CNRS-IRD-Univ. Avignon 3 Place Victor Hugo, 13331 Marseille CEDEX 3, FranceWe aimed at quantifying biogenic volatile organic compound (BVOC) emissions in June from three Mediterranean species located at the O<sub>3</sub>HP site (southern France): <i>Quercus pubescens</i>, <i>Acer monspessulanum</i> and <i>C. coggygria</i> (for isoprene only). As <i>Q. pubescens</i> was shown to be the main BVOC emitter with isoprene representing ≈ 99% of the carbon emitted as BVOC, we mainly focused on this species. <i>C. coggygria</i> was found to be a non-isoprene emitter (no other BVOCs were investigated). <br></br> To fully understand both the canopy effect on <i>Q. pubescens </i> isoprene emissions and the inter-individual variability (tree to tree and within canopy), diurnal variations of isoprene were investigated from nine branches (seven branches located to the top of canopy at ≈ 4 m above ground level (a.g.l.), and two inside the canopy at ≈ 2 m a.g.l.). <br></br> The <i>Q. pubescens</i> daily mean isoprene emission rate (ER<sub>d</sub>) fluctuated between 23 and 98 μgC g<sub>DM</sub><sup>−1</sup> h<sup>−1</sup>. <i>Q. pubescens</i> daily mean net assimilation (Pn) ranged between 5.4 and 13.8, and 2.8 and 6.4 μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup> for sunlit and shaded branches respectively. Both ER<sub>d</sub> and isoprene emission factors (Is), assessed according to Guenther et al. (1993) algorithm, varied by a factor of 4.3 among the sunlit branches. While sunlit branches ER<sub>d</sub> was clearly higher than for shaded branches, there was a non-significant variability of Is (59 to 77 μgC g<sub>DM</sub><sup>−1</sup> h<sup>−1</sup>). Diurnal variations of isoprene emission rates (ERs) for sunlit branches were also investigated. ERs were detected at dawn 2 h after Pn became positive and were mostly exponentially dependent on Pn. Diurnal variations of ERs were not equally well described throughout the day by temperature (C<sub>T</sub>) and light (C<sub>L</sub>) parameters according to G93 algorithm. Temperature had more impact than photosynthetically active radiation (PAR) on the morning emissions increase, and ER was no longer correlated to C<sub>L</sub> × C<sub>T</sub> between solar noon (maximum ER) and mid-afternoon, possibly due to thermal stress of the plant. A comparison between measured and calculated emissions using two isoprene algorithms (G93 and MEGAN – Model of Emissions of Gases and Aerosols from Nature) highlighted the importance of isoprene emission factor Is value used, and some weakness in assessing isoprene emissions under Mediterranean climate conditions (drought) with current isoprene models.http://www.atmos-chem-phys.net/15/431/2015/acp-15-431-2015.pdf |
| spellingShingle | A.-C. Genard-Zielinski C. Boissard C. Fernandez C. Kalogridis J. Lathière V. Gros N. Bonnaire E. Ormeño Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> Atmospheric Chemistry and Physics |
| title | Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> |
| title_full | Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> |
| title_fullStr | Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> |
| title_full_unstemmed | Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> |
| title_short | Variability of BVOC emissions from a Mediterranean mixed forest in southern France with a focus on <i>Quercus pubescens</i> |
| title_sort | variability of bvoc emissions from a mediterranean mixed forest in southern france with a focus on i quercus pubescens i |
| url | http://www.atmos-chem-phys.net/15/431/2015/acp-15-431-2015.pdf |
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