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Title: Interacting Effects of Leaf Water Potential and Biomass on Vegetation Optical Depth

Abstract

Remotely sensed microwave observations of vegetation optical depth (VOD) have been widely used for examining vegetation responses to climate. Nevertheless, the relative impacts of phenological changes in leaf biomass and water stress on VOD have not been explicitly disentangled. In particular, determining whether leaf water potential ( ψ L) affects VOD may allow these data sets as a constraint for plant hydraulic models. Here, in this work, we test the sensitivity of VOD to variations in ψ L and present a conceptual framework that relates VOD to ψ L and total biomass including leaves, whose dynamics are measured through leaf area index, and woody components. We used measurements of ψ L from three sites across the US—a mixed deciduous forests in Indiana and Missouri and a piñon-juniper woodland in New Mexico—to validate the conceptual model. The temporal dynamics of X-band VOD were similar to those of the VOD signal estimated from the new conceptual model with observed ψ L ( R 2 = 0.6–0.8). At the global scale, accounting for a combination of biomass and estimated ψ L (based on satellite surface soil moisture data) increased correlations with VOD by ~ 15% and 30% compared to biomass and water potential, respectively. Inmore » wetter regions with denser and taller canopy heights, VOD has a higher correlation with leaf area index than with water stress and vice versa in drier regions. Our results demonstrate that variations in both phenology and ψ L must be considered to accurately interpret the dynamics of VOD observations for ecological applications.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4];  [5]; ORCiD logo [1]
  1. Stanford Univ., CA (United States)
  2. Univ. of Missouri, Columbia, MO (United States)
  3. Indiana Univ., Bloomington, IN (United States)
  4. Univ. of New Mexico, Albuquerque, NM (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1430444
Alternate Identifier(s):
OSTI ID: 1410354
Report Number(s):
[PNNL-SA-130914]
[Journal ID: ISSN 2169-8953; 830403000]
Grant/Contract Number:  
[AC05-76RL01830; AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
[ Journal Volume: 122; Journal Issue: 11]; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; microwave remote sensing; vegetation optical depth; vegetation water content; leaf water potential; biomass

Citation Formats

Momen, Mostafa, Wood, Jeffrey D., Novick, Kimberly A., Pangle, Robert, Pockman, William T., McDowell, Nate G., and Konings, Alexandra G. Interacting Effects of Leaf Water Potential and Biomass on Vegetation Optical Depth. United States: N. p., 2017. Web. doi:10.1002/2017JG004145.
Momen, Mostafa, Wood, Jeffrey D., Novick, Kimberly A., Pangle, Robert, Pockman, William T., McDowell, Nate G., & Konings, Alexandra G. Interacting Effects of Leaf Water Potential and Biomass on Vegetation Optical Depth. United States. doi:10.1002/2017JG004145.
Momen, Mostafa, Wood, Jeffrey D., Novick, Kimberly A., Pangle, Robert, Pockman, William T., McDowell, Nate G., and Konings, Alexandra G. Thu . "Interacting Effects of Leaf Water Potential and Biomass on Vegetation Optical Depth". United States. doi:10.1002/2017JG004145. https://www.osti.gov/servlets/purl/1430444.
@article{osti_1430444,
title = {Interacting Effects of Leaf Water Potential and Biomass on Vegetation Optical Depth},
author = {Momen, Mostafa and Wood, Jeffrey D. and Novick, Kimberly A. and Pangle, Robert and Pockman, William T. and McDowell, Nate G. and Konings, Alexandra G.},
abstractNote = {Remotely sensed microwave observations of vegetation optical depth (VOD) have been widely used for examining vegetation responses to climate. Nevertheless, the relative impacts of phenological changes in leaf biomass and water stress on VOD have not been explicitly disentangled. In particular, determining whether leaf water potential (ψL) affects VOD may allow these data sets as a constraint for plant hydraulic models. Here, in this work, we test the sensitivity of VOD to variations in ψL and present a conceptual framework that relates VOD to ψL and total biomass including leaves, whose dynamics are measured through leaf area index, and woody components. We used measurements of ψL from three sites across the US—a mixed deciduous forests in Indiana and Missouri and a piñon-juniper woodland in New Mexico—to validate the conceptual model. The temporal dynamics of X-band VOD were similar to those of the VOD signal estimated from the new conceptual model with observed ψL (R2 = 0.6–0.8). At the global scale, accounting for a combination of biomass and estimated ψL (based on satellite surface soil moisture data) increased correlations with VOD by ~ 15% and 30% compared to biomass and water potential, respectively. In wetter regions with denser and taller canopy heights, VOD has a higher correlation with leaf area index than with water stress and vice versa in drier regions. Our results demonstrate that variations in both phenology and ψL must be considered to accurately interpret the dynamics of VOD observations for ecological applications.},
doi = {10.1002/2017JG004145},
journal = {Journal of Geophysical Research. Biogeosciences},
number = [11],
volume = [122],
place = {United States},
year = {2017},
month = {11}
}

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    Works referencing / citing this record:

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