Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories
A shift from temperature-limited to water-limited tree performance is occurring at around 60°N latitude across the circumboreal biome, in concord with current warming trends. This shift is likely to induce extensive vegetation changes and forest die-back, and also to exacerbate biotic outbreaks and...
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Online Access: | http://hdl.handle.net/10459.1/70121 https://doi.org/10.1016/j.scitotenv.2020.137590 |
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ftunivlleida:oai:repositori.udl.cat:10459.1/70121 2023-05-15T18:30:41+02:00 Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories Voltas Velasco, Jordi Aguilera, Mònica Gutiérrez, Emilia Shestakova, Tatiana A. 2020-12-21T07:20:39Z application/pdf http://hdl.handle.net/10459.1/70121 https://doi.org/10.1016/j.scitotenv.2020.137590 eng eng Elsevier Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2020.137590 Science of the Total Environment, 2020, vol. 720, p. 137590 0048-9697 http://hdl.handle.net/10459.1/70121 https://doi.org/10.1016/j.scitotenv.2020.137590 cc-by-nc-nd (c) Elsevier, 2020 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess CC-BY-NC-ND Boreal forests Carbon isotopes Climate warming Dendroecology Tree rings info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 2020 ftunivlleida https://doi.org/10.1016/j.scitotenv.2020.137590 2022-11-16T00:07:13Z A shift from temperature-limited to water-limited tree performance is occurring at around 60°N latitude across the circumboreal biome, in concord with current warming trends. This shift is likely to induce extensive vegetation changes and forest die-back, and also to exacerbate biotic outbreaks and wildfires, affecting the global carbon budget. We used carbon isotope discrimination (Δ13C) in tree rings to analyze the long-term physiological responses of five representative species that coexist in the middle taiga of Western Siberia, including dark-needled, drought-susceptible (Abies sibirica, Picea obovata, Pinus sibirica) and light-needled, drought-resistant (Larix sibirica, Pinus sylvestris) conifers. We hypothesized that droughts are differentially imprinted in dark and light conifers, with stronger Δ13C-responsiveness in the latter reflecting a more conservative water use. We found similar Δ13C-climate relationships related to the moisture regime of the summer season across species, indicating shared drought responses; however, divergent intrinsic water-use efficiency (WUEi) trajectories from 1950 to 2013 were observed for pines (increasing by ca. 10%) and other conifers (increasing by ca. 25%). These contrasting patterns suggested the passive and active stomatal regulation of gas exchange in these trees, respectively, and led us to discard our initial hypothesis. Discriminant analysis shed light on the climate characteristics responsible for such differential behavior, with years having lower temperatures from May through August (3 °C colder on average) being responsible for reduced pine WUEi. This finding may be related to the higher plasticity of phenology of pines and the greater susceptibility of fir and spruce to cold damage and heat shock during the early growing season (late April-May). Together with recent negative growth trends and increasing ring-width vs. Δ13C coupling, these results indicate the greater susceptibility of spruce and fir, compared with pines and larch, in boreal ecosystems when ... Article in Journal/Newspaper taiga Siberia Universitat de Lleida: Repositori Obert UdL Science of The Total Environment 720 137590 |
institution |
Open Polar |
collection |
Universitat de Lleida: Repositori Obert UdL |
op_collection_id |
ftunivlleida |
language |
English |
topic |
Boreal forests Carbon isotopes Climate warming Dendroecology Tree rings |
spellingShingle |
Boreal forests Carbon isotopes Climate warming Dendroecology Tree rings Voltas Velasco, Jordi Aguilera, Mònica Gutiérrez, Emilia Shestakova, Tatiana A. Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
topic_facet |
Boreal forests Carbon isotopes Climate warming Dendroecology Tree rings |
description |
A shift from temperature-limited to water-limited tree performance is occurring at around 60°N latitude across the circumboreal biome, in concord with current warming trends. This shift is likely to induce extensive vegetation changes and forest die-back, and also to exacerbate biotic outbreaks and wildfires, affecting the global carbon budget. We used carbon isotope discrimination (Δ13C) in tree rings to analyze the long-term physiological responses of five representative species that coexist in the middle taiga of Western Siberia, including dark-needled, drought-susceptible (Abies sibirica, Picea obovata, Pinus sibirica) and light-needled, drought-resistant (Larix sibirica, Pinus sylvestris) conifers. We hypothesized that droughts are differentially imprinted in dark and light conifers, with stronger Δ13C-responsiveness in the latter reflecting a more conservative water use. We found similar Δ13C-climate relationships related to the moisture regime of the summer season across species, indicating shared drought responses; however, divergent intrinsic water-use efficiency (WUEi) trajectories from 1950 to 2013 were observed for pines (increasing by ca. 10%) and other conifers (increasing by ca. 25%). These contrasting patterns suggested the passive and active stomatal regulation of gas exchange in these trees, respectively, and led us to discard our initial hypothesis. Discriminant analysis shed light on the climate characteristics responsible for such differential behavior, with years having lower temperatures from May through August (3 °C colder on average) being responsible for reduced pine WUEi. This finding may be related to the higher plasticity of phenology of pines and the greater susceptibility of fir and spruce to cold damage and heat shock during the early growing season (late April-May). Together with recent negative growth trends and increasing ring-width vs. Δ13C coupling, these results indicate the greater susceptibility of spruce and fir, compared with pines and larch, in boreal ecosystems when ... |
format |
Article in Journal/Newspaper |
author |
Voltas Velasco, Jordi Aguilera, Mònica Gutiérrez, Emilia Shestakova, Tatiana A. |
author_facet |
Voltas Velasco, Jordi Aguilera, Mònica Gutiérrez, Emilia Shestakova, Tatiana A. |
author_sort |
Voltas Velasco, Jordi |
title |
Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
title_short |
Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
title_full |
Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
title_fullStr |
Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
title_full_unstemmed |
Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
title_sort |
shared drought responses among conifer species in the middle siberian taiga are uncoupled from their contrasting water-use efficiency trajectories |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10459.1/70121 https://doi.org/10.1016/j.scitotenv.2020.137590 |
genre |
taiga Siberia |
genre_facet |
taiga Siberia |
op_relation |
Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2020.137590 Science of the Total Environment, 2020, vol. 720, p. 137590 0048-9697 http://hdl.handle.net/10459.1/70121 https://doi.org/10.1016/j.scitotenv.2020.137590 |
op_rights |
cc-by-nc-nd (c) Elsevier, 2020 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.scitotenv.2020.137590 |
container_title |
Science of The Total Environment |
container_volume |
720 |
container_start_page |
137590 |
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1766214250223632384 |