@article{Holtzman-2021-L-band,
title = "L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand",
author = "Holtzman, Nataniel and
Anderegg, Leander D. L. and
Kraatz, Simon and
Mavrovic, Alex and
Sonnentag, Oliver and
Pappas, Christoforos and
Cosh, Michael H. and
Langlois, Alexandre and
Lakhankar, Tarendra and
Tesser, Derek and
Steiner, N. and
Colliander, Andreas and
Roy, Alexandre and
Konings, Alexandra G.",
journal = "Biogeosciences, Volume 18, Issue 2",
volume = "18",
number = "2",
year = "2021",
publisher = "Copernicus GmbH",
url = "https://gwf-uwaterloo.github.io/gwf-publications/G21-88001",
doi = "10.5194/bg-18-739-2021",
pages = "739--753",
abstract = "Abstract. Vegetation optical depth (VOD) retrieved from microwave radiometry correlates with the total amount of water in vegetation, based on theoretical and empirical evidence. Because the total amount of water in vegetation varies with relative water content (as well as with biomass), this correlation further suggests a possible relationship between VOD and plant water potential, a quantity that drives plant hydraulic behavior. Previous studies have found evidence for that relationship on the scale of satellite pixels tens of kilometers across, but these comparisons suffer from significant scaling error. Here we used small-scale remote sensing to test the link between remotely sensed VOD and plant water potential. We placed an L-band radiometer on a tower above the canopy looking down at red oak forest stand during the 2019 growing season in central Massachusetts, United States. We measured stem xylem and leaf water potentials of trees within the stand and retrieved VOD with a single-channel algorithm based on continuous radiometer measurements and measured soil moisture. VOD exhibited a diurnal cycle similar to that of leaf and stem water potential, with a peak at approximately 05:00 eastern daylight time (UTC−4). VOD was also positively correlated with both the measured dielectric constant and water potentials of stem xylem over the growing season. The presence of moisture on the leaves did not affect the observed relationship between VOD and stem water potential. We used our observed VOD{--}water-potential relationship to estimate stand-level values for a radiative transfer parameter and a plant hydraulic parameter, which compared well with the published literature. Our findings support the use of VOD for plant hydraulic studies in temperate forests.",
}
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<abstract>Abstract. Vegetation optical depth (VOD) retrieved from microwave radiometry correlates with the total amount of water in vegetation, based on theoretical and empirical evidence. Because the total amount of water in vegetation varies with relative water content (as well as with biomass), this correlation further suggests a possible relationship between VOD and plant water potential, a quantity that drives plant hydraulic behavior. Previous studies have found evidence for that relationship on the scale of satellite pixels tens of kilometers across, but these comparisons suffer from significant scaling error. Here we used small-scale remote sensing to test the link between remotely sensed VOD and plant water potential. We placed an L-band radiometer on a tower above the canopy looking down at red oak forest stand during the 2019 growing season in central Massachusetts, United States. We measured stem xylem and leaf water potentials of trees within the stand and retrieved VOD with a single-channel algorithm based on continuous radiometer measurements and measured soil moisture. VOD exhibited a diurnal cycle similar to that of leaf and stem water potential, with a peak at approximately 05:00 eastern daylight time (UTC−4). VOD was also positively correlated with both the measured dielectric constant and water potentials of stem xylem over the growing season. The presence of moisture on the leaves did not affect the observed relationship between VOD and stem water potential. We used our observed VOD–water-potential relationship to estimate stand-level values for a radiative transfer parameter and a plant hydraulic parameter, which compared well with the published literature. Our findings support the use of VOD for plant hydraulic studies in temperate forests.</abstract>
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%0 Journal Article
%T L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand
%A Holtzman, Nataniel
%A Anderegg, Leander D. L.
%A Kraatz, Simon
%A Mavrovic, Alex
%A Sonnentag, Oliver
%A Pappas, Christoforos
%A Cosh, Michael H.
%A Langlois, Alexandre
%A Lakhankar, Tarendra
%A Tesser, Derek
%A Steiner, N.
%A Colliander, Andreas
%A Roy, Alexandre
%A Konings, Alexandra G.
%J Biogeosciences, Volume 18, Issue 2
%D 2021
%V 18
%N 2
%I Copernicus GmbH
%F Holtzman-2021-L-band
%X Abstract. Vegetation optical depth (VOD) retrieved from microwave radiometry correlates with the total amount of water in vegetation, based on theoretical and empirical evidence. Because the total amount of water in vegetation varies with relative water content (as well as with biomass), this correlation further suggests a possible relationship between VOD and plant water potential, a quantity that drives plant hydraulic behavior. Previous studies have found evidence for that relationship on the scale of satellite pixels tens of kilometers across, but these comparisons suffer from significant scaling error. Here we used small-scale remote sensing to test the link between remotely sensed VOD and plant water potential. We placed an L-band radiometer on a tower above the canopy looking down at red oak forest stand during the 2019 growing season in central Massachusetts, United States. We measured stem xylem and leaf water potentials of trees within the stand and retrieved VOD with a single-channel algorithm based on continuous radiometer measurements and measured soil moisture. VOD exhibited a diurnal cycle similar to that of leaf and stem water potential, with a peak at approximately 05:00 eastern daylight time (UTC−4). VOD was also positively correlated with both the measured dielectric constant and water potentials of stem xylem over the growing season. The presence of moisture on the leaves did not affect the observed relationship between VOD and stem water potential. We used our observed VOD–water-potential relationship to estimate stand-level values for a radiative transfer parameter and a plant hydraulic parameter, which compared well with the published literature. Our findings support the use of VOD for plant hydraulic studies in temperate forests.
%R 10.5194/bg-18-739-2021
%U https://gwf-uwaterloo.github.io/gwf-publications/G21-88001
%U https://doi.org/10.5194/bg-18-739-2021
%P 739-753
Markdown (Informal)
[L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand](https://gwf-uwaterloo.github.io/gwf-publications/G21-88001) (Holtzman et al., GWF 2021)
ACL
- Nataniel Holtzman, Leander D. L. Anderegg, Simon Kraatz, Alex Mavrovic, Oliver Sonnentag, Christoforos Pappas, Michael H. Cosh, Alexandre Langlois, Tarendra Lakhankar, Derek Tesser, N. Steiner, Andreas Colliander, Alexandre Roy, and Alexandra G. Konings. 2021. L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand. Biogeosciences, Volume 18, Issue 2, 18(2):739–753.
