Examination of the parameters controlling the triple oxygen isotope composition of grass leaf water and phytoliths at a Mediterranean site: a model–data approach
Claudia Voigt
(1, 2)
,
Anne Alexandre
(1)
,
Ilja M Reiter
(3)
,
Jean-Philippe Orts
(4)
,
Christine Vallet-Coulomb
(1)
,
Clément Piel
(5)
,
Jean-Charles Mazur
(1)
,
Julie C Aleman
(1)
,
Corinne Sonzogni
(1)
,
Helene Miche
(1)
,
Jérôme Ogée
(6)
1
CEREGE -
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement
2 University of Almeria
3 ECCOREV - Ecosystèmes continentaux et risques environnementaux
4 IMBE - Institut méditerranéen de biodiversité et d'écologie marine et continentale
5 Écotron Européen de Montpellier
6 UMR ISPA - Interactions Sol Plante Atmosphère
2 University of Almeria
3 ECCOREV - Ecosystèmes continentaux et risques environnementaux
4 IMBE - Institut méditerranéen de biodiversité et d'écologie marine et continentale
5 Écotron Européen de Montpellier
6 UMR ISPA - Interactions Sol Plante Atmosphère
Claudia Voigt
- Fonction : Auteur
- PersonId : 739269
- IdHAL : cvoigt
- ORCID : 0000-0003-2124-9684
Anne Alexandre
- Fonction : Auteur
- PersonId : 169586
- IdHAL : anne-alexandre
- ORCID : 0000-0003-0696-4022
Christine Vallet-Coulomb
- Fonction : Auteur
- PersonId : 12645
- IdHAL : christine-vallet-coulomb
- ORCID : 0000-0001-5898-1516
- IdRef : 153068191
Jean-Charles Mazur
- Fonction : Auteur
- PersonId : 171987
- IdHAL : jean-charles-mazur
- IdRef : 253129230
Julie C Aleman
- Fonction : Auteur
- PersonId : 1218751
- IdHAL : julie-aleman
- ORCID : 0000-0003-0835-7015
- IdRef : 178579270
Corinne Sonzogni
- Fonction : Auteur
- PersonId : 938006
- IdHAL : corinne-sonzogni
- ORCID : 0000-0002-2898-1942
Helene Miche
- Fonction : Auteur
- PersonId : 169715
- IdHAL : helene-miche
- ORCID : 0000-0002-4261-4874
- IdRef : 13003522X
Jérôme Ogée
- Fonction : Auteur
- PersonId : 734842
- IdHAL : jerome-ogee
- ORCID : 0000-0002-3365-8584
- IdRef : 183431480
Résumé
Triple oxygen isotopes (17O-excess) of water are useful to trace evaporation at the soil–plant–atmosphere interface. The 17O-excess of plant silica, i.e., phytoliths, inherited from leaf water, was previously calibrated in growth chambers as a proxy of atmospheric relative humidity (RH). Here, using a model–data approach, we examine the parameters that control the triple oxygen isotope composition of bulk grass leaf water and phytoliths in natura, at the O3HP experimental platform located in the French Mediterranean area. A grass plot was equipped to measure for 1 year, all environmental and plant physiological parameters relevant for modeling the isotope composition of the grass leaf water. In particular, the triple oxygen and hydrogen isotope composition of atmospheric water vapor above the grass was measured continuously using a cavity ring-down spectrometer, and the grass leaf temperature was monitored at plot scale using an infrared (IR) radiometer. Grass leaves were collected in different seasons of the year and over a 24 h period in June. Grass leaf water was extracted by cryogenic vacuum distillation and analyzed by isotope ratio mass spectrometry (IRMS). Phytoliths were analyzed by IR–laser fluorination–IRMS after chemical extraction. We showed that the traditional Craig–Gordon steady-state model modified for grass leaves reliably predicts the triple oxygen isotope composition of leaf water during daytime but is sensitive to uncertainties on the leaf-to-air temperature difference. Deviations from isotope steady state at night are well represented in the triple oxygen isotope system and predictable by a non-steady-state model. The 17O-excess of phytoliths confirms the applicability of the 17O-excessphyto vs. RH equation established in previous growth chamber experiments. Further, it recorded average daytime RH over the growth period rather than daily RH, related to low transpiration and silicification during the night. This model–data approach highlights the utility of the triple oxygen isotope system to improve the understanding of water exchange at the soil–plant–atmosphere interface. The in natura experiment underlines the applicability of 17O-excess of phytoliths as a RH proxy.
Domaines
Sciences de l'environnementFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Examination of the parameters controlling the triple oxygen isotope composition of grass leaf water and phytoliths at a Mediterranean site: a model–data approach
|
Résumé |
en
Triple oxygen isotopes (17O-excess) of water are useful to trace evaporation at the soil–plant–atmosphere interface. The 17O-excess of plant silica, i.e., phytoliths, inherited from leaf water, was previously calibrated in growth chambers as a proxy of atmospheric relative humidity (RH). Here, using a model–data approach, we examine the parameters that control the triple oxygen isotope composition of bulk grass leaf water and phytoliths in natura, at the O3HP experimental platform located in the French Mediterranean area. A grass plot was equipped to measure for 1 year, all environmental and plant physiological parameters relevant for modeling the isotope composition of the grass leaf water. In particular, the triple oxygen and hydrogen isotope composition of atmospheric water vapor above the grass was measured continuously using a cavity ring-down spectrometer, and the grass leaf temperature was monitored at plot scale using an infrared (IR) radiometer. Grass leaves were collected in different seasons of the year and over a 24 h period in June. Grass leaf water was extracted by cryogenic vacuum distillation and analyzed by isotope ratio mass spectrometry (IRMS). Phytoliths were analyzed by IR–laser fluorination–IRMS after chemical extraction. We showed that the traditional Craig–Gordon steady-state model modified for grass leaves reliably predicts the triple oxygen isotope composition of leaf water during daytime but is sensitive to uncertainties on the leaf-to-air temperature difference. Deviations from isotope steady state at night are well represented in the triple oxygen isotope system and predictable by a non-steady-state model. The 17O-excess of phytoliths confirms the applicability of the 17O-excessphyto vs. RH equation established in previous growth chamber experiments. Further, it recorded average daytime RH over the growth period rather than daily RH, related to low transpiration and silicification during the night. This model–data approach highlights the utility of the triple oxygen isotope system to improve the understanding of water exchange at the soil–plant–atmosphere interface. The in natura experiment underlines the applicability of 17O-excess of phytoliths as a RH proxy.
|
Auteur(s) |
Claudia Voigt
1, 2
, Anne Alexandre
1
, Ilja M Reiter
3
, Jean-Philippe Orts
4
, Christine Vallet-Coulomb
1
, Clément Piel
5
, Jean-Charles Mazur
1
, Julie C Aleman
1
, Corinne Sonzogni
1
, Helene Miche
1
, Jérôme Ogée
6
1
CEREGE -
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement
( 1002357 )
- Europôle Méditerranéen de l'Arbois - Avenue Louis Philibert - BP 80 - 13545 Aix-en-Provence cedex 4
- France
2
University of Almeria
( 532300 )
- Espagne
3
ECCOREV -
Ecosystèmes continentaux et risques environnementaux
( 96756 )
- Europôle de l'Arbois
BP 80
13545 Aix-en-Provence cedex 4
- France
4
IMBE -
Institut méditerranéen de biodiversité et d'écologie marine et continentale
( 188653 )
- Aix Marseille Université, Campus Etoile, Faculté St-Jérôme case 421 Av. . escadrille Normandie-Niemen 13397 MARSEILLE CEDEX 20
- France
5
Écotron Européen de Montpellier
( 513534 )
- 1 chemin de rioux
34980 Montferrier-sur-Lez
- France
6
UMR ISPA -
Interactions Sol Plante Atmosphère
( 1002425 )
- F - 3388 3 Villenave d'Ornon Cedex
- France
|
Licence |
Paternité
|
Date de publication |
2023-06-15
|
Public visé |
Scientifique
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Langue du document |
Anglais
|
Nom de la revue |
|
Volume |
20
|
Numéro |
11
|
Page/Identifiant |
2161-2187
|
Projet(s) ANR |
|
Domaine(s) |
|
DOI | 10.5194/bg-20-2161-2023 |
UT key WOS | 001010627000001 |
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