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 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. Considering total evapotranspiration in young plantations can affect WUE interpretations.
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Acknowledgements
Scott Oswald collected monthly LAI and leaf litter and maintained sap flow sensors for the end of growing year 3. Nathan Melear provided critical resource support and field assistance for instrumentation and hydrometric data collection. Wesley Gerrin provided critical field assistance for instrumentation and hydrometric data collection. Shannon Kirk collected and curated weekly hydrometric data for 2017. Chris Lewis collected and curated weekly hydrometric data for 2018 and 2019. Kevin Fouts provided critical support for instrument installation and weekly hydrometric data collection. We thank an anonymous reviewer for thoughtful comments that substantially improved the manuscript.
Funding
This work was supported by the USDA National Institute of Food and Agriculture, Agriculture and Food Research Initiative [grant numbers 2013–67009-21405, 2013–67009-25148, 2019–67019-29906 as well as McIntire-Stennis project 1023985] and was based upon work supported by the Department of Energy to the University of Georgia Research Foundation [grant number DE-EM0004391] and to the U.S. Forest Service Savannah River [grant number DE-EM0003622].
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Conceptualization, CRJ, DPA; data curation, SEY, MJD, DPA; formal analysis, SEY, CRJ, DPA; funding acquisition, CRJ, DPA, PVC; investigation, SEY, MJD, DPA, CRJ, PVC; methodology, CRJ, DPA, PVC; project administration, CRJ, DPA; supervision: CRJ, DPA; visualization: SEY; writing—original draft, SEY; writing—review and editing, CRJ, DPA, SEY, MJD, PVC.
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Younger, S.E., Jackson, C.R., Dix, M.J. et al. Evapotranspiration Partitioning of Eucalyptus benthamii and Pinus taeda During Early Stand Development. Bioenerg. Res. 16, 2204–2218 (2023). https://doi.org/10.1007/s12155-023-10591-w
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DOI: https://doi.org/10.1007/s12155-023-10591-w