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Cascading effects associated with climate-change-induced conifer mortality in mountain temperate forests result in hot-spots of soil CO2 emissions.

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Title: Cascading effects associated with climate-change-induced conifer mortality in mountain temperate forests result in hot-spots of soil CO2 emissions.
Authors: Curiel Yuste, J.1,2 jorge.curiel@bc3research.org, Flores-Rentería, D.3, García-Angulo, D.1, Hereş, A.-M.1,4, Bragă, C.5, Petritan, A.-M.5, Petritan, I.C.1,4 petritan@unitbv.ro
Source: Soil Biology & Biochemistry. Jun2019, Vol. 133, p50-59. 10p.
Subjects: Soil respiration, Climate change, Conifers, Carbon dioxide mitigation, Mountain forests
Abstract: Abstract Climate change-induced tree mortality is occurring worldwide, at increasingly larger scales and with increasing frequency. How climate change-induced tree mortality could affect the ecology and carbon (C) sink capacity of soils remains unknown. This study investigated regional-scale drought-induced tree mortality, based on events that occurred after a very dry year (2012) in the Carpathians mountain range (Romania), which caused mortality in three common conifer species: Scots pine, Black pine, and Silver fir. This resulted in hot-spots of biogenic soil CO 2 emissions (soil respiration; Rs). Four to five years after the main mortality event, Rs-related soil CO 2 emissions under dead trees were, on average, 21% (ranging from 18 to 35%) higher than CO 2 emissions under living trees. Total (Rs) and heterotrophic (R H)-related soil CO 2 emissions were strongly related to alterations in the soil environment following tree mortality (e.g. changes in quantity and quality of soil organic matter, microclimate, pH or fine root demography). Moreover, the massive mortality event of 2012 resulted in greater presence of successional vegetation (broadleaf seedlings, shrubland and grasses), which may control the environmental factors that either directly or indirectly affected biotic soil fluxes (Rs and R H). Besides the well-known direct effects of climate change on soil CO 2 emissions, the cascading effects triggered by climate change-induced tree mortality could also exert a strong indirect impact on soil CO 2 emissions. Overall, climate change-induced tree mortality alters the magnitude of environmental controls on Rs and hence determines how the ecosystem C budget responds to climate change. Graphical abstract Image 1 Highlights • Episodes of drought-induced conifer mortality are becoming more frequent in Europe. • Conifer mortality triggers secondary succession of autochthonous broadleaf species. • Tree mortality triggers complex cascading effects which ultimately affects R s. • Changes in fine root specific root length (SRL) correlates negatively with R H. [ABSTRACT FROM AUTHOR]
Copyright of Soil Biology & Biochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Cascading effects associated with climate-change-induced conifer mortality in mountain temperate forests result in hot-spots of soil CO2 emissions.
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  Data: <searchLink fieldCode="AR" term="%22Curiel+Yuste%2C+J%2E%22">Curiel Yuste, J.</searchLink><relatesTo>1,2</relatesTo><i> jorge.curiel@bc3research.org</i><br /><searchLink fieldCode="AR" term="%22Flores-Rentería%2C+D%2E%22">Flores-Rentería, D.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22García-Angulo%2C+D%2E%22">García-Angulo, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hereş%2C+A%2E-M%2E%22">Hereş, A.-M.</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Bragă%2C+C%2E%22">Bragă, C.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Petritan%2C+A%2E-M%2E%22">Petritan, A.-M.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Petritan%2C+I%2EC%2E%22">Petritan, I.C.</searchLink><relatesTo>1,4</relatesTo><i> petritan@unitbv.ro</i>
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  Data: <searchLink fieldCode="JN" term="%22Soil+Biology+%26+Biochemistry%22">Soil Biology & Biochemistry</searchLink>. Jun2019, Vol. 133, p50-59. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Soil+respiration%22">Soil respiration</searchLink><br /><searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Conifers%22">Conifers</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide+mitigation%22">Carbon dioxide mitigation</searchLink><br /><searchLink fieldCode="DE" term="%22Mountain+forests%22">Mountain forests</searchLink>
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  Data: Abstract Climate change-induced tree mortality is occurring worldwide, at increasingly larger scales and with increasing frequency. How climate change-induced tree mortality could affect the ecology and carbon (C) sink capacity of soils remains unknown. This study investigated regional-scale drought-induced tree mortality, based on events that occurred after a very dry year (2012) in the Carpathians mountain range (Romania), which caused mortality in three common conifer species: Scots pine, Black pine, and Silver fir. This resulted in hot-spots of biogenic soil CO 2 emissions (soil respiration; Rs). Four to five years after the main mortality event, Rs-related soil CO 2 emissions under dead trees were, on average, 21% (ranging from 18 to 35%) higher than CO 2 emissions under living trees. Total (Rs) and heterotrophic (R H)-related soil CO 2 emissions were strongly related to alterations in the soil environment following tree mortality (e.g. changes in quantity and quality of soil organic matter, microclimate, pH or fine root demography). Moreover, the massive mortality event of 2012 resulted in greater presence of successional vegetation (broadleaf seedlings, shrubland and grasses), which may control the environmental factors that either directly or indirectly affected biotic soil fluxes (Rs and R H). Besides the well-known direct effects of climate change on soil CO 2 emissions, the cascading effects triggered by climate change-induced tree mortality could also exert a strong indirect impact on soil CO 2 emissions. Overall, climate change-induced tree mortality alters the magnitude of environmental controls on Rs and hence determines how the ecosystem C budget responds to climate change. Graphical abstract Image 1 Highlights • Episodes of drought-induced conifer mortality are becoming more frequent in Europe. • Conifer mortality triggers secondary succession of autochthonous broadleaf species. • Tree mortality triggers complex cascading effects which ultimately affects R s. • Changes in fine root specific root length (SRL) correlates negatively with R H. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Soil Biology & Biochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.soilbio.2019.02.017
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        Type: general
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      – SubjectFull: Conifers
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              Text: Jun2019
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