Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development
Abstract
Increasing demand for bioenergy from intensively managed woody crops raises concerns of increased evapotranspiration and potential decreases in water yield. Pinus taeda (loblolly pine) is currently the most cultivated species in the southeastern USA, the country’s wood basket. However, Eucalyptus species could achieve greater productivity but with unknown ramifications for water budgets. To address the knowledge gap, we determined annual water budgets of loblolly pine and Eucalyptus benthamii (eucalypt) from growing years 3 through 5 in a replicated (n = 3) two-factor design comparing species and groundwater depth. Paired plots were established across a depth-to-groundwater gradient from shallow (~ 2 m) to deep (~ 8 m). Hydrologic budgets were constructed by measuring precipitation, interception, soil evaporation, and transpiration. Eucalypt evapotranspiration and above-ground biomass production for growing years 3 through 5 were on average 25 and 14% greater than pine, respectively; however, evapotranspiration did not differ across groundwater depths. At the end of growing year 5, eucalypt had higher transpiration and evapotranspiration per unit area than pine. Soil evaporation was substantial in young plantations (nearly 500 mm) in growing year 3 but declined as the canopy closed. Partitioning of evapotranspiration components in developing bioenergy plantations was dynamic due to canopy developmentmore »
- Authors:
-
[1];
[2];
[4];
[3]
- University of Georgia, Athens, GA (United States); Savannah River Ecology Laboratory, Aiken, SC (United States); The Jones Center at Ichauway, Newton, GA (United States)
- University of Georgia, Athens, GA (United States)
- University of Georgia, Athens, GA (United States); Savannah River Ecology Laboratory, Aiken, SC (United States)
- USDA Forest Service, Otto, NC (United States)
- Publication Date:
- Research Org.:
- Savannah River Ecology Laboratory, Aiken, SC (United States)
- Sponsoring Org.:
- USDOE; USDA National Institute of Food and Agriculture, Agriculture and Food Research Initiative
- OSTI Identifier:
- 2228450
- Grant/Contract Number:
- EM0003622; EM0004391; EM0005228; 013–67009-21405; 2013–67009-25148; 2019–67019-29906
- Resource Type:
- Accepted Manuscript
- Journal Name:
- BioEnergy Research
- Additional Journal Information:
- Journal Volume: 16; Journal ID: ISSN 1939-1234
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Transpiration; Sap flow; Evaporation; Evapotranspiration; Biomass; Bioenergy; Water use efficiency
Citation Formats
Younger, Seth E., Jackson, C. Rhett, Dix, Mackenzie J., Caldwell, Peter V., and Aubrey, Doug P. Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development. United States: N. p., 2023.
Web. doi:10.1007/s12155-023-10591-w.
Younger, Seth E., Jackson, C. Rhett, Dix, Mackenzie J., Caldwell, Peter V., & Aubrey, Doug P. Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development. United States. https://doi.org/10.1007/s12155-023-10591-w
Younger, Seth E., Jackson, C. Rhett, Dix, Mackenzie J., Caldwell, Peter V., and Aubrey, Doug P. Thu .
"Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development". United States. https://doi.org/10.1007/s12155-023-10591-w. https://www.osti.gov/servlets/purl/2228450.
@article{osti_2228450,
title = {Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development},
author = {Younger, Seth E. and Jackson, C. Rhett and Dix, Mackenzie J. and Caldwell, Peter V. and Aubrey, Doug P.},
abstractNote = {Increasing demand for bioenergy from intensively managed woody crops raises concerns of increased evapotranspiration and potential decreases in water yield. Pinus taeda (loblolly pine) is currently the most cultivated species in the southeastern USA, the country’s wood basket. However, Eucalyptus species could achieve greater productivity but with unknown ramifications for water budgets. To address the knowledge gap, we determined annual water budgets of loblolly pine and Eucalyptus benthamii (eucalypt) from growing years 3 through 5 in a replicated (n = 3) two-factor design comparing species and groundwater depth. Paired plots were established across a depth-to-groundwater gradient from shallow (~ 2 m) to deep (~ 8 m). Hydrologic budgets were constructed by measuring precipitation, interception, soil evaporation, and transpiration. Eucalypt evapotranspiration and above-ground biomass production for growing years 3 through 5 were on average 25 and 14% greater than pine, respectively; however, evapotranspiration did not differ across groundwater depths. At the end of growing year 5, eucalypt had higher transpiration and evapotranspiration per unit area than pine. Soil evaporation was substantial in young plantations (nearly 500 mm) in growing year 3 but declined as the canopy closed. Partitioning of evapotranspiration components in developing bioenergy plantations was dynamic due to canopy development driven decreases in soil evaporation and increases in transpiration and interception; total evapotranspiration was less variable from year to year. Water use efficiency (WUE, kg biomass/m3 H2O) per unit evapotranspiration was similar between species, but WUE per unit transpiration was higher in pine. As a result, considering total evapotranspiration in young plantations can affect WUE interpretations.},
doi = {10.1007/s12155-023-10591-w},
journal = {BioEnergy Research},
number = ,
volume = 16,
place = {United States},
year = {Thu Apr 06 00:00:00 EDT 2023},
month = {Thu Apr 06 00:00:00 EDT 2023}
}
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