A model for leaf temperature decoupling from air temperature

Benjamin Blonder; Sean T. Michaletz

doi:10.1016/j.agrformet.2018.07.012

A model for leaf temperature decoupling from air temperature

Benjamin Blonder, Sean T. Michaletz

Life Sciences, School of (SOLS)

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Leaf temperature (T_leaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between T_leaf and T_air, β describes leaf thermal responses. A range of values have been observed, with β <1 indicating limited homeothermy where T_leaf increases at a lower rate than T_air, β = 1 indicating poikilothermy where T_leaf tracks T_air, and β >1 indicating megathermy where T_leaf increasingly exceeds T_air. However, theory for variation in β has not been developed. Here we derive an equation for β that predicts how it varies with multiple trait and microenvironment variables. The approach also predicts how maintenance of T_leaf away from lethally high values may help explain regulation of stomatal conductance (g_S). The work delineates contexts in which each class of leaf thermal response is expected and develops concepts for predicting leaf responses to thermally extreme environments.

Original language	English (US)
Pages (from-to)	354-360
Number of pages	7
Journal	Agricultural and Forest Meteorology
Volume	262
DOIs	https://doi.org/10.1016/j.agrformet.2018.07.012
State	Published - Nov 15 2018

Keywords

Ecophysiology
Energy balance
Heat stress
Leaf temperature
Stomatal regulation

ASJC Scopus subject areas

Forestry
Global and Planetary Change
Agronomy and Crop Science
Atmospheric Science

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10.1016/j.agrformet.2018.07.012

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title = "A model for leaf temperature decoupling from air temperature",

abstract = "Leaf temperature (Tleaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between Tleaf and Tair, β describes leaf thermal responses. A range of values have been observed, with β <1 indicating limited homeothermy where Tleaf increases at a lower rate than Tair, β = 1 indicating poikilothermy where Tleaf tracks Tair, and β >1 indicating megathermy where Tleaf increasingly exceeds Tair. However, theory for variation in β has not been developed. Here we derive an equation for β that predicts how it varies with multiple trait and microenvironment variables. The approach also predicts how maintenance of Tleaf away from lethally high values may help explain regulation of stomatal conductance (gS). The work delineates contexts in which each class of leaf thermal response is expected and develops concepts for predicting leaf responses to thermally extreme environments.",

keywords = "Ecophysiology, Energy balance, Heat stress, Leaf temperature, Stomatal regulation",

author = "Benjamin Blonder and Michaletz, {Sean T.}",

note = "Funding Information: BB developed theory with input from SM. BB and SM collected data. BB and SM wrote the manuscript. SM was supported by a Los Alamos National Laboratory Director{\textquoteright}s Fellowship. Funding Information: BB was supported by a UK Natural Environment Research Council independent research fellowship NE/M019160/1 . Colorado field measurements were supported by permits from the United States Forest Service and the Rocky Mountain Biological Laboratory. Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

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day = "15",

doi = "10.1016/j.agrformet.2018.07.012",

language = "English (US)",

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AU - Blonder, Benjamin

AU - Michaletz, Sean T.

N1 - Funding Information: BB developed theory with input from SM. BB and SM collected data. BB and SM wrote the manuscript. SM was supported by a Los Alamos National Laboratory Director’s Fellowship. Funding Information: BB was supported by a UK Natural Environment Research Council independent research fellowship NE/M019160/1 . Colorado field measurements were supported by permits from the United States Forest Service and the Rocky Mountain Biological Laboratory. Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - Leaf temperature (Tleaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between Tleaf and Tair, β describes leaf thermal responses. A range of values have been observed, with β <1 indicating limited homeothermy where Tleaf increases at a lower rate than Tair, β = 1 indicating poikilothermy where Tleaf tracks Tair, and β >1 indicating megathermy where Tleaf increasingly exceeds Tair. However, theory for variation in β has not been developed. Here we derive an equation for β that predicts how it varies with multiple trait and microenvironment variables. The approach also predicts how maintenance of Tleaf away from lethally high values may help explain regulation of stomatal conductance (gS). The work delineates contexts in which each class of leaf thermal response is expected and develops concepts for predicting leaf responses to thermally extreme environments.

AB - Leaf temperature (Tleaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between Tleaf and Tair, β describes leaf thermal responses. A range of values have been observed, with β <1 indicating limited homeothermy where Tleaf increases at a lower rate than Tair, β = 1 indicating poikilothermy where Tleaf tracks Tair, and β >1 indicating megathermy where Tleaf increasingly exceeds Tair. However, theory for variation in β has not been developed. Here we derive an equation for β that predicts how it varies with multiple trait and microenvironment variables. The approach also predicts how maintenance of Tleaf away from lethally high values may help explain regulation of stomatal conductance (gS). The work delineates contexts in which each class of leaf thermal response is expected and develops concepts for predicting leaf responses to thermally extreme environments.

KW - Ecophysiology

KW - Energy balance

KW - Heat stress

KW - Leaf temperature

KW - Stomatal regulation

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SP - 354

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JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

ER -

A model for leaf temperature decoupling from air temperature

Abstract

Keywords

ASJC Scopus subject areas

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