Articles | Volume 20, issue 21
https://doi.org/10.5194/bg-20-4455-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-4455-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Nov 2023
Research article |
| 08 Nov 2023
| 08 Nov 2023
Sap flow and leaf gas exchange response to a drought and heatwave in urban green spaces in a Nordic city
Joyson Ahongshangbam
CORRESPONDING AUTHOR
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Helsinki Institute of Sustainability Science, University of Helsinki, Finland
Liisa Kulmala
Climate System Research, Finnish Meteorological Institute, Helsinki, Finland
Institute for Atmospheric and Earth System Research/Forest Sciences, Viikki Plant Science Centre (ViPS), Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
Jesse Soininen
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Yasmin Frühauf
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Esko Karvinen
Climate System Research, Finnish Meteorological Institute, Helsinki, Finland
Yann Salmon
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Institute for Atmospheric and Earth System Research/Forest Sciences, Viikki Plant Science Centre (ViPS), Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
Anna Lintunen
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Institute for Atmospheric and Earth System Research/Forest Sciences, Viikki Plant Science Centre (ViPS), Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
Anni Karvonen
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Leena Järvi
Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Helsinki Institute of Sustainability Science, University of Helsinki, Finland
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Cited
15 citations as recorded by crossref.
- Carbon sequestration in different urban vegetation types in Southern Finland L. Thölix et al. https://doi.org/10.5194/bg-22-725-2025
- Lawns and meadows in urban green space – a comparison from perspectives of greenhouse gases, drought resilience and plant functional types J. Trémeau et al. https://doi.org/10.5194/bg-21-949-2024
- Urban shrubs have greater transpiration than natural ones due to their fast climate adaptation: A global synthesis R. Yang et al. https://doi.org/10.1016/j.ecofro.2026.02.002
- Urbanization reshapes vegetation rhythms: Phenological instability and climate sensitivity compared to protected areas L. Fan et al. https://doi.org/10.1016/j.uclim.2026.102941
- Comparative evaluation of machine learning models integrated with optimization algorithms for daily transpiration estimation in citrus orchards of dry-hot valley region in China M. Wu et al. https://doi.org/10.1016/j.compag.2026.111773
- Controls on tree transpiration dynamics in an urban environment M. Anys & M. Weiler https://doi.org/10.1016/j.agrformet.2025.110726
- Soil respiration across a variety of tree-covered urban green spaces in Helsinki, Finland E. Karvinen et al. https://doi.org/10.5194/soil-10-381-2024
- From boreal forests to boreal cities—assessing the applicability of a forest growth and carbon balance model to tree-covered urban green spaces E. Karvinen et al. https://doi.org/10.1088/2515-7620/ae7253
- Urban-rural differences in transpiration patterns of Pinus tabuliformis and environmental drivers H. Liu et al. https://doi.org/10.3389/fpls.2026.1861479
- Multi-sensor microclimate and tree canopy dataset from a linden tree for green infrastructure validation P. Schöneberger et al. https://doi.org/10.1038/s41597-026-07536-1
- Impact of urban trees on carbon dioxide exchange: Mechanistic pathways, environmental controls, and feedback Z. Wang et al. https://doi.org/10.1016/j.jenvman.2025.124028
- Calibrating primary crop parameters to capture undersown species impacts Q. Bell et al. https://doi.org/10.1016/j.eja.2025.127676
- Quantifying the hydraulic safety of urban trees: Do street environments impose greater strain than parks? A. Dekel et al. https://doi.org/10.1016/j.ufug.2026.129446
- Physiological and Morphological Responses of Tilia tomentosa, Liriodendron tulipifera, and Liquidambar styraciflua to Urban Stress: Implications for Roadside Tree Selection E. Vastag et al. https://doi.org/10.1016/j.tfp.2026.101316
- Future climate impacts on carbon sequestration dynamics across urban ecosystem types in Finnish cities A. Koiso-Kanttila et al. https://doi.org/10.1007/s11252-026-01974-w
15 citations as recorded by crossref.
- Carbon sequestration in different urban vegetation types in Southern Finland L. Thölix et al. https://doi.org/10.5194/bg-22-725-2025
- Lawns and meadows in urban green space – a comparison from perspectives of greenhouse gases, drought resilience and plant functional types J. Trémeau et al. https://doi.org/10.5194/bg-21-949-2024
- Urban shrubs have greater transpiration than natural ones due to their fast climate adaptation: A global synthesis R. Yang et al. https://doi.org/10.1016/j.ecofro.2026.02.002
- Urbanization reshapes vegetation rhythms: Phenological instability and climate sensitivity compared to protected areas L. Fan et al. https://doi.org/10.1016/j.uclim.2026.102941
- Comparative evaluation of machine learning models integrated with optimization algorithms for daily transpiration estimation in citrus orchards of dry-hot valley region in China M. Wu et al. https://doi.org/10.1016/j.compag.2026.111773
- Controls on tree transpiration dynamics in an urban environment M. Anys & M. Weiler https://doi.org/10.1016/j.agrformet.2025.110726
- Soil respiration across a variety of tree-covered urban green spaces in Helsinki, Finland E. Karvinen et al. https://doi.org/10.5194/soil-10-381-2024
- From boreal forests to boreal cities—assessing the applicability of a forest growth and carbon balance model to tree-covered urban green spaces E. Karvinen et al. https://doi.org/10.1088/2515-7620/ae7253
- Urban-rural differences in transpiration patterns of Pinus tabuliformis and environmental drivers H. Liu et al. https://doi.org/10.3389/fpls.2026.1861479
- Multi-sensor microclimate and tree canopy dataset from a linden tree for green infrastructure validation P. Schöneberger et al. https://doi.org/10.1038/s41597-026-07536-1
- Impact of urban trees on carbon dioxide exchange: Mechanistic pathways, environmental controls, and feedback Z. Wang et al. https://doi.org/10.1016/j.jenvman.2025.124028
- Calibrating primary crop parameters to capture undersown species impacts Q. Bell et al. https://doi.org/10.1016/j.eja.2025.127676
- Quantifying the hydraulic safety of urban trees: Do street environments impose greater strain than parks? A. Dekel et al. https://doi.org/10.1016/j.ufug.2026.129446
- Physiological and Morphological Responses of Tilia tomentosa, Liriodendron tulipifera, and Liquidambar styraciflua to Urban Stress: Implications for Roadside Tree Selection E. Vastag et al. https://doi.org/10.1016/j.tfp.2026.101316
- Future climate impacts on carbon sequestration dynamics across urban ecosystem types in Finnish cities A. Koiso-Kanttila et al. https://doi.org/10.1007/s11252-026-01974-w
Saved (final revised paper)
Latest update: 15 Jun 2026
Short summary
Urban vegetation is important for removing urban CO2 emissions and cooling. We studied the response of urban trees' functions (photosynthesis and transpiration) to a heatwave and drought at four urban green areas in the city of Helsinki. We found that tree water use was increased during heatwave and drought periods, but there was no change in the photosynthesis rates. The heat and drought conditions were severe at the local scale but were not excessive enough to restrict urban trees' functions.
Urban vegetation is important for removing urban CO2 emissions and cooling. We studied the...
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