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Assessing the Contrasting Effects of the Exceptional 2015 Drought on the Carbon Dynamics in Two Norway Spruce Forest Ecosystems

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Title: Assessing the Contrasting Effects of the Exceptional 2015 Drought on the Carbon Dynamics in Two Norway Spruce Forest Ecosystems
Authors: Caleb Mensah, Ladislav Šigut, Milan Fischer, Lenka Foltýnová, Georg Jocher, Manuel Acosta, Natalia Kowalska, Lukáš Kokrda, Marian Pavelka, John David Marshall, Emmanuel K. Nyantakyi, Michal V. Marek
Source: Atmosphere, Vol 12, Iss 8, p 988 (2021)
Publisher Information: MDPI AG, 2021.
Publication Year: 2021
Collection: LCC:Meteorology. Climatology
Subject Terms: climate change, water stress, soil moisture, atmospheric evaporative demand, eddy covariance, gross primary productivity, Meteorology. Climatology, QC851-999
More Details: The occurrence of extreme drought poses a severe threat to forest ecosystems and reduces their capability to sequester carbon dioxide. This study analysed the impacts of a central European summer drought in 2015 on gross primary productivity (GPP) at two Norway spruce forest sites representing two contrasting climatic conditions—cold and humid climate at Bílý Kříž (CZ-BK1) vs. moderately warm and dry climate at Rájec (CZ-RAJ). The comparative analyses of GPP was based on a three-year eddy covariance dataset, where 2014 and 2016 represented years with normal conditions, while 2015 was characterized by dry conditions. A significant decline in the forest GPP was found during the dry year of 2015, reaching 14% and 6% at CZ-BK1 and CZ-RAJ, respectively. The reduction in GPP coincided with high ecosystem respiration (Reco) during the dry year period, especially during July and August, when several heat waves hit the region. Additional analyses of GPP decline during the dry year period suggested that a vapour pressure deficit played a more important role than the soil volumetric water content at both investigated sites, highlighting the often neglected importance of considering the species hydraulic strategy (isohydric vs. anisohydric) in drought impact assessments. The study indicates the high vulnerability of the Norway spruce forest to drought stress, especially at sites with precipitation equal or smaller than the atmospheric evaporative demand. Since central Europe is currently experiencing large-scale dieback of Norway spruce forests in lowlands and uplands (such as for CZ-RAJ conditions), the findings of this study may help to quantitatively assess the fate of these widespread cultures under future climate projections, and may help to delimitate the areas of their sustainable production.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2073-4433
Relation: https://www.mdpi.com/2073-4433/12/8/988; https://doaj.org/toc/2073-4433
DOI: 10.3390/atmos12080988
Access URL: https://doaj.org/article/821610a97b6a44218c223845cd6e9629
Accession Number: edsdoj.821610a97b6a44218c223845cd6e9629
Database: Directory of Open Access Journals
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  Data: Assessing the Contrasting Effects of the Exceptional 2015 Drought on the Carbon Dynamics in Two Norway Spruce Forest Ecosystems
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  Data: <searchLink fieldCode="AR" term="%22Caleb+Mensah%22">Caleb Mensah</searchLink><br /><searchLink fieldCode="AR" term="%22Ladislav+Šigut%22">Ladislav Šigut</searchLink><br /><searchLink fieldCode="AR" term="%22Milan+Fischer%22">Milan Fischer</searchLink><br /><searchLink fieldCode="AR" term="%22Lenka+Foltýnová%22">Lenka Foltýnová</searchLink><br /><searchLink fieldCode="AR" term="%22Georg+Jocher%22">Georg Jocher</searchLink><br /><searchLink fieldCode="AR" term="%22Manuel+Acosta%22">Manuel Acosta</searchLink><br /><searchLink fieldCode="AR" term="%22Natalia+Kowalska%22">Natalia Kowalska</searchLink><br /><searchLink fieldCode="AR" term="%22Lukáš+Kokrda%22">Lukáš Kokrda</searchLink><br /><searchLink fieldCode="AR" term="%22Marian+Pavelka%22">Marian Pavelka</searchLink><br /><searchLink fieldCode="AR" term="%22John+David+Marshall%22">John David Marshall</searchLink><br /><searchLink fieldCode="AR" term="%22Emmanuel+K%2E+Nyantakyi%22">Emmanuel K. Nyantakyi</searchLink><br /><searchLink fieldCode="AR" term="%22Michal+V%2E+Marek%22">Michal V. Marek</searchLink>
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  Data: Atmosphere, Vol 12, Iss 8, p 988 (2021)
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  Data: MDPI AG, 2021.
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  Data: The occurrence of extreme drought poses a severe threat to forest ecosystems and reduces their capability to sequester carbon dioxide. This study analysed the impacts of a central European summer drought in 2015 on gross primary productivity (GPP) at two Norway spruce forest sites representing two contrasting climatic conditions—cold and humid climate at Bílý Kříž (CZ-BK1) vs. moderately warm and dry climate at Rájec (CZ-RAJ). The comparative analyses of GPP was based on a three-year eddy covariance dataset, where 2014 and 2016 represented years with normal conditions, while 2015 was characterized by dry conditions. A significant decline in the forest GPP was found during the dry year of 2015, reaching 14% and 6% at CZ-BK1 and CZ-RAJ, respectively. The reduction in GPP coincided with high ecosystem respiration (Reco) during the dry year period, especially during July and August, when several heat waves hit the region. Additional analyses of GPP decline during the dry year period suggested that a vapour pressure deficit played a more important role than the soil volumetric water content at both investigated sites, highlighting the often neglected importance of considering the species hydraulic strategy (isohydric vs. anisohydric) in drought impact assessments. The study indicates the high vulnerability of the Norway spruce forest to drought stress, especially at sites with precipitation equal or smaller than the atmospheric evaporative demand. Since central Europe is currently experiencing large-scale dieback of Norway spruce forests in lowlands and uplands (such as for CZ-RAJ conditions), the findings of this study may help to quantitatively assess the fate of these widespread cultures under future climate projections, and may help to delimitate the areas of their sustainable production.
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      – SubjectFull: water stress
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      – SubjectFull: soil moisture
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