Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica)
Submediterranean forests are considered an ecotone between Mediterranean and Eurosiberian ecosystems, and are very sensitive to global change. A decline of Scots pine (Pinus sylvestris L.) and a related expansion of oak species (Quercus spp.) have been reported in the Spanish Pre-Pyrenees. Although...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/60521 |
| Acceso en línea: | https://doi.org/10.1093/treephys/tpx101 http://hdl.handle.net/10459.1/60521 |
| Access Level: | acceso abierto |
| Palabra clave: | Forest decline drought Stable isotopes Isohydric Submediterranean Forest |
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Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica)Martín Gómez, PaulaAguilera, MònicaPemán García, JesúsGil Pelegrín, EustaquioFerrio Díaz, Juan PedroForest declinedroughtStable isotopesIsohydricSubmediterranean ForestSubmediterranean forests are considered an ecotone between Mediterranean and Eurosiberian ecosystems, and are very sensitive to global change. A decline of Scots pine (Pinus sylvestris L.) and a related expansion of oak species (Quercus spp.) have been reported in the Spanish Pre-Pyrenees. Although this has been associated with increasing drought stress, the underlying mechanisms are not fully understood, and suitable monitoring protocols are lacking. The aim of this study is to bring insight into the physiological mechanisms anticipating selective decline of the pines, with particular focus on carbon and water relations. For this purpose, we performed a sampling campaign covering two growing seasons in a mixed stand of P. sylvestris and Quercus subpyrenaica E.H del Villar. We sampled seasonally twig xylem and soil for water isotope composition (δ18O and δ2H), leaves for carbon isotope composition (δ13C) and stems to quantify non-structural carbohydrates (NSC) concentration, and measured water potential and leaf gas exchange. The first summer drought was severe for both species, reaching low predawn water potential (−2.2 MPa), very low stomatal conductance (12 ± 1.0 mmol m−2 s−1) and near-zero or even negative net photosynthesis, particularly in P. sylvestris (−0.6 ± 0.34 μmol m−2 s−1 in oaks, −1.3 ± 0.16 μmol m−2 s−1 in pines). Hence, the tighter stomatal control and more isohydric strategy of P. sylvestris resulted in larger limitations on carbon assimilation, and this was also reflected in carbon storage, showing twofold larger total NSC concentration in oaks than in pines (7.8 ± 2.4% and 4.0 ± 1.3%, respectively). We observed a faster recovery of predawn water potential after summer drought in Q. subpyrenaica than in P. sylvestris (−0.8 MPa and −1.1 MPa, respectively). As supported by the isotopic data, this was probably associated with a deeper and more reliable water supply in Q. subpyrenaica. In line with these short-term observations, we found a more pronounced negative effect of steadily increasing drought stress on long-term growth in pines compared with oaks. All these observations confer evidence of early warning of P. sylvestris decline and indicate the adaptive advantage of Q. subpyrenaica in the area.We thank Pilar Sopeña, Maria Josep Pau and Mireia Oromí for laboratory assistance on isotope and carbohydrate analyses; Instituto de Formación Agroambiental de Jaca, Unidad de Salud de los Bosques de Aragón, Miguel Ángel Lázaro and Jorge del Castillo for their support in field campaigns. The research was supported by the Spanish Government through projects AGL 2012-40039-C02 and AGL 2012-40151-C03, the PhD fellowship to P.M.G. (FPU12/00648) and Ramón y Cajal contract to J.P.F. (RYC-2008-02050).Oxford University Press2017201720172017info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionapplication/pdfhttps://doi.org/10.1093/treephys/tpx101http://hdl.handle.net/10459.1/60521http://hdl.handle.net/10459.1/60521reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)Inglésinfo:eu-repo/grantAgreement/MINECO//AGL2012-40039-C02-01info:eu-repo/grantAgreement/MINECO//AGL2012-40039-C02-02info:eu-repo/grantAgreement/MINECO//AGL2012-40151-C03-02info:eu-repo/grantAgreement/MINECO//AGL2012-40151-C03-03Versió preprint del document publicat a: https://doi.org/10.1093/treephys/tpx101Tree Physiology, 2017, vol. 37, núm. 11, p. 1478–1492,(c) Martín et al., 2017info:eu-repo/semantics/openAccessoai:recercat.cat:10459.1/605212026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| title |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| spellingShingle |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) Martín Gómez, Paula Forest decline drought Stable isotopes Isohydric Submediterranean Forest |
| title_short |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| title_full |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| title_fullStr |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| title_full_unstemmed |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| title_sort |
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) |
| dc.creator.none.fl_str_mv |
Martín Gómez, Paula Aguilera, Mònica Pemán García, Jesús Gil Pelegrín, Eustaquio Ferrio Díaz, Juan Pedro |
| author |
Martín Gómez, Paula |
| author_facet |
Martín Gómez, Paula Aguilera, Mònica Pemán García, Jesús Gil Pelegrín, Eustaquio Ferrio Díaz, Juan Pedro |
| author_role |
author |
| author2 |
Aguilera, Mònica Pemán García, Jesús Gil Pelegrín, Eustaquio Ferrio Díaz, Juan Pedro |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Forest decline drought Stable isotopes Isohydric Submediterranean Forest |
| topic |
Forest decline drought Stable isotopes Isohydric Submediterranean Forest |
| description |
Submediterranean forests are considered an ecotone between Mediterranean and Eurosiberian ecosystems, and are very sensitive to global change. A decline of Scots pine (Pinus sylvestris L.) and a related expansion of oak species (Quercus spp.) have been reported in the Spanish Pre-Pyrenees. Although this has been associated with increasing drought stress, the underlying mechanisms are not fully understood, and suitable monitoring protocols are lacking. The aim of this study is to bring insight into the physiological mechanisms anticipating selective decline of the pines, with particular focus on carbon and water relations. For this purpose, we performed a sampling campaign covering two growing seasons in a mixed stand of P. sylvestris and Quercus subpyrenaica E.H del Villar. We sampled seasonally twig xylem and soil for water isotope composition (δ18O and δ2H), leaves for carbon isotope composition (δ13C) and stems to quantify non-structural carbohydrates (NSC) concentration, and measured water potential and leaf gas exchange. The first summer drought was severe for both species, reaching low predawn water potential (−2.2 MPa), very low stomatal conductance (12 ± 1.0 mmol m−2 s−1) and near-zero or even negative net photosynthesis, particularly in P. sylvestris (−0.6 ± 0.34 μmol m−2 s−1 in oaks, −1.3 ± 0.16 μmol m−2 s−1 in pines). Hence, the tighter stomatal control and more isohydric strategy of P. sylvestris resulted in larger limitations on carbon assimilation, and this was also reflected in carbon storage, showing twofold larger total NSC concentration in oaks than in pines (7.8 ± 2.4% and 4.0 ± 1.3%, respectively). We observed a faster recovery of predawn water potential after summer drought in Q. subpyrenaica than in P. sylvestris (−0.8 MPa and −1.1 MPa, respectively). As supported by the isotopic data, this was probably associated with a deeper and more reliable water supply in Q. subpyrenaica. In line with these short-term observations, we found a more pronounced negative effect of steadily increasing drought stress on long-term growth in pines compared with oaks. All these observations confer evidence of early warning of P. sylvestris decline and indicate the adaptive advantage of Q. subpyrenaica in the area. |
| publishDate |
2017 |
| dc.date.none.fl_str_mv |
2017 2017 2017 2017 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/submittedVersion |
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article |
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submittedVersion |
| dc.identifier.none.fl_str_mv |
https://doi.org/10.1093/treephys/tpx101 http://hdl.handle.net/10459.1/60521 http://hdl.handle.net/10459.1/60521 |
| url |
https://doi.org/10.1093/treephys/tpx101 http://hdl.handle.net/10459.1/60521 |
| dc.language.none.fl_str_mv |
Inglés |
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Inglés |
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info:eu-repo/grantAgreement/MINECO//AGL2012-40039-C02-01 info:eu-repo/grantAgreement/MINECO//AGL2012-40039-C02-02 info:eu-repo/grantAgreement/MINECO//AGL2012-40151-C03-02 info:eu-repo/grantAgreement/MINECO//AGL2012-40151-C03-03 Versió preprint del document publicat a: https://doi.org/10.1093/treephys/tpx101 Tree Physiology, 2017, vol. 37, núm. 11, p. 1478–1492, |
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(c) Martín et al., 2017 info:eu-repo/semantics/openAccess |
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(c) Martín et al., 2017 |
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openAccess |
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Oxford University Press |
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Oxford University Press |
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