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Article: Plant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales

TitlePlant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales
Authors
Guo, ZhengfeiZhang, KunLin, HuaMajcher, Bartosz MarekLee, Ka Fai CalvinStill, ChristopherWu, Jin
Keywordscanopy temperature
carbon cycle
climate change
energy balance
FLUXNET
transpiration
Issue Date30-Jun-2023
PublisherElsevier
Citation
Agricultural and Forest Meteorology, 2023, v. 339 How to Cite?
DOI: http://dx.doi.org/10.1016/j.agrformet.2023.109582
Abstract

Plant canopy temperature (Tc) plays a crucial role in regulating plant growth and metabolism. Although dominant controls on Tc are observed to differ across timescales, whether this would cause differences in plant thermoregulation capability (PTC) remains unclear, raising concerns about extrapolating findings on plant thermoregulation from one timescale to another. Here we constructed diurnal and seasonal datasets of Tc, air temperature (Ta), and other biotic and abiotic factors from global hourly flux data, and explored diurnal and seasonal variations in PTC (indicated by Tc vs. Ta regression slope, with lower slopes indicating higher Tc stability and stronger thermoregulation). Our result revealed significantly lower Tc vs. Ta slopes (i.e. stronger PTC) at seasonal than diurnal timescales, primarily due to different transpiration cooling at high Ta between the two timescales. At the diurnal timescale, transpiration rates initially increase before decreasing with Ta after reaching a specific temperature threshold (∼85th percentile of Ta; related to midday depression of stomatal activities); Conversely, at the seasonal timescale, transpiration rates consistently increase with Ta (related to the coincidence among high water availability and the peak annual Ta). PTC also displays considerable spatial variability, with latent heat vs. net radiation relationship and water availability being the dominant regulators. Collectively, we recommend caution when extrapolating thermoregulation-relevant conclusions drawn from short-term observations to longer-term predictions, and vice versa, since they have different patterns and underlying mechanisms.


Persistent Identifierhttp://hdl.handle.net/10722/331059
ISSN
0168-1923
2021 Impact Factor: 6.424
2020 SCImago Journal Rankings: 1.837
ISI Accession Number ID
WOS:001033049700001

 

DC FieldValueLanguage
dc.contributor.authorGuo, Zhengfei-
dc.contributor.authorZhang, Kun-
dc.contributor.authorLin, Hua-
dc.contributor.authorMajcher, Bartosz Marek-
dc.contributor.authorLee, Ka Fai Calvin-
dc.contributor.authorStill, Christopher-
dc.contributor.authorWu, Jin-
dc.date.accessioned2023-09-21T06:52:25Z-
dc.date.available2023-09-21T06:52:25Z-
dc.date.issued2023-06-30-
dc.identifier.citationAgricultural and Forest Meteorology, 2023, v. 339-
dc.identifier.issn0168-1923-
dc.identifier.urihttp://hdl.handle.net/10722/331059-
dc.description.abstract<p>Plant canopy temperature (<em>T</em><sub>c</sub>) plays a crucial role in regulating plant growth and metabolism. Although dominant controls on <em>T</em><sub>c</sub> are observed to differ across timescales, whether this would cause differences in plant <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/thermoregulation" title="Learn more about thermoregulation from ScienceDirect's AI-generated Topic Pages">thermoregulation</a> capability (PTC) remains unclear, raising concerns about extrapolating findings on plant thermoregulation from one timescale to another. Here we constructed diurnal and seasonal datasets of <em>T</em><sub>c</sub>, air temperature (<em>T</em><sub>a</sub>), and other biotic and abiotic factors from global hourly flux data, and explored diurnal and seasonal variations in PTC (indicated by <em>T</em><sub>c</sub> <em>vs. T</em><sub>a</sub> regression slope, with lower slopes indicating higher <em>T</em><sub>c</sub> stability and stronger thermoregulation). Our result revealed significantly lower <em>T</em><sub>c</sub> <em>vs. T</em><sub>a</sub> slopes (i.e. stronger PTC) at seasonal than diurnal timescales, primarily due to different transpiration cooling at high <em>T</em><sub>a</sub> between the two timescales. At the diurnal timescale, transpiration rates initially increase before decreasing with <em>T</em><sub>a</sub> after reaching a specific temperature threshold (∼85<sup>th</sup> percentile of <em>T</em><sub>a</sub>; related to midday depression of stomatal activities); Conversely, at the seasonal timescale, transpiration rates consistently increase with <em>T</em><sub>a</sub> (related to the coincidence among high water availability and the peak annual <em>T</em><sub>a</sub>). PTC also displays considerable spatial variability, with latent heat <em>vs</em>. net radiation relationship and water availability being the dominant regulators. Collectively, we recommend caution when extrapolating thermoregulation-relevant conclusions drawn from short-term observations to longer-term predictions, and <em>vice versa</em>, since they have different patterns and underlying mechanisms.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofAgricultural and Forest Meteorology-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectcanopy temperature-
dc.subjectcarbon cycle-
dc.subjectclimate change-
dc.subjectenergy balance-
dc.subjectFLUXNET-
dc.subjecttranspiration-
dc.titlePlant canopies exhibit stronger thermoregulation capability at the seasonal than diurnal timescales-
dc.typeArticle-
dc.identifier.doi10.1016/j.agrformet.2023.109582-
dc.identifier.scopuseid_2-s2.0-85163850035-
dc.identifier.volume339-
dc.identifier.isiWOS:001033049700001-
dc.identifier.issnl0168-1923-

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