Evapotranspiration and soil water content in a scrub-oak woodland under carbon dioxide enrichment

Bruce A Hungate, M. Reichstein, Paul Dijkstra, D. Johnson, G. Hymus, J. D. Tenhunen, C. R. Hinkle, B. G. Drake

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Leaf conductance often decreases in response to elevated atmospheric CO2 concentration (Ca) potentially leading to changes in hydrology. We describe the hydrological responses of Florida scrub oak to elevated Ca during an eight-month period two years after Ca manipulation began. Whole-chamber gas exchange measurements revealed a consistent reduction in evapotranspiration in response to elevated Ca, despite an increase in leaf area index (LAI). Elevated Ca also increased surface soil water content, but xylem water deuterium measurements show that the dominant oaks in this system take up most of their water from the water table (which occurs at a depth of 1.5-3 m), suggesting that the water savings in elevated Ca in this system are primarily manifested as reduced water uptake at depth. Extrapolating these results to larger areas requires considering a number of processes that operate on scales beyond these accessible in this field experiment. Nevertheless, these results demonstrate the potential for reduced evapotranspiration and associated changes in hydrology in ecosystems dominated by woody vegetation in response to elevated Ca.

Original languageEnglish (US)
Pages (from-to)289-298
Number of pages10
JournalGlobal Change Biology
Volume8
Issue number3
DOIs
StatePublished - 2002

Fingerprint

carbon dioxide enrichment
Evapotranspiration
scrub
Carbon Dioxide
Water content
evapotranspiration
woodland
hydrology
soil water
water content
Soils
hydrological response
Water
water uptake
deuterium
xylem
gas exchange
leaf area index
Hydrology
water table

Keywords

  • Elevated CO
  • Evapotranspiration
  • Hydrology
  • Soil water content

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Evapotranspiration and soil water content in a scrub-oak woodland under carbon dioxide enrichment. / Hungate, Bruce A; Reichstein, M.; Dijkstra, Paul; Johnson, D.; Hymus, G.; Tenhunen, J. D.; Hinkle, C. R.; Drake, B. G.

In: Global Change Biology, Vol. 8, No. 3, 2002, p. 289-298.

Research output: Contribution to journalArticle

Hungate, Bruce A ; Reichstein, M. ; Dijkstra, Paul ; Johnson, D. ; Hymus, G. ; Tenhunen, J. D. ; Hinkle, C. R. ; Drake, B. G. / Evapotranspiration and soil water content in a scrub-oak woodland under carbon dioxide enrichment. In: Global Change Biology. 2002 ; Vol. 8, No. 3. pp. 289-298.
@article{1f62fb872cc741b79c1d0e7ac516bf1d,
title = "Evapotranspiration and soil water content in a scrub-oak woodland under carbon dioxide enrichment",
abstract = "Leaf conductance often decreases in response to elevated atmospheric CO2 concentration (Ca) potentially leading to changes in hydrology. We describe the hydrological responses of Florida scrub oak to elevated Ca during an eight-month period two years after Ca manipulation began. Whole-chamber gas exchange measurements revealed a consistent reduction in evapotranspiration in response to elevated Ca, despite an increase in leaf area index (LAI). Elevated Ca also increased surface soil water content, but xylem water deuterium measurements show that the dominant oaks in this system take up most of their water from the water table (which occurs at a depth of 1.5-3 m), suggesting that the water savings in elevated Ca in this system are primarily manifested as reduced water uptake at depth. Extrapolating these results to larger areas requires considering a number of processes that operate on scales beyond these accessible in this field experiment. Nevertheless, these results demonstrate the potential for reduced evapotranspiration and associated changes in hydrology in ecosystems dominated by woody vegetation in response to elevated Ca.",
keywords = "Elevated CO, Evapotranspiration, Hydrology, Soil water content",
author = "Hungate, {Bruce A} and M. Reichstein and Paul Dijkstra and D. Johnson and G. Hymus and Tenhunen, {J. D.} and Hinkle, {C. R.} and Drake, {B. G.}",
year = "2002",
doi = "10.1046/j.1365-2486.2002.00468.x",
language = "English (US)",
volume = "8",
pages = "289--298",
journal = "Global Change Biology",
issn = "1354-1013",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Evapotranspiration and soil water content in a scrub-oak woodland under carbon dioxide enrichment

AU - Hungate, Bruce A

AU - Reichstein, M.

AU - Dijkstra, Paul

AU - Johnson, D.

AU - Hymus, G.

AU - Tenhunen, J. D.

AU - Hinkle, C. R.

AU - Drake, B. G.

PY - 2002

Y1 - 2002

N2 - Leaf conductance often decreases in response to elevated atmospheric CO2 concentration (Ca) potentially leading to changes in hydrology. We describe the hydrological responses of Florida scrub oak to elevated Ca during an eight-month period two years after Ca manipulation began. Whole-chamber gas exchange measurements revealed a consistent reduction in evapotranspiration in response to elevated Ca, despite an increase in leaf area index (LAI). Elevated Ca also increased surface soil water content, but xylem water deuterium measurements show that the dominant oaks in this system take up most of their water from the water table (which occurs at a depth of 1.5-3 m), suggesting that the water savings in elevated Ca in this system are primarily manifested as reduced water uptake at depth. Extrapolating these results to larger areas requires considering a number of processes that operate on scales beyond these accessible in this field experiment. Nevertheless, these results demonstrate the potential for reduced evapotranspiration and associated changes in hydrology in ecosystems dominated by woody vegetation in response to elevated Ca.

AB - Leaf conductance often decreases in response to elevated atmospheric CO2 concentration (Ca) potentially leading to changes in hydrology. We describe the hydrological responses of Florida scrub oak to elevated Ca during an eight-month period two years after Ca manipulation began. Whole-chamber gas exchange measurements revealed a consistent reduction in evapotranspiration in response to elevated Ca, despite an increase in leaf area index (LAI). Elevated Ca also increased surface soil water content, but xylem water deuterium measurements show that the dominant oaks in this system take up most of their water from the water table (which occurs at a depth of 1.5-3 m), suggesting that the water savings in elevated Ca in this system are primarily manifested as reduced water uptake at depth. Extrapolating these results to larger areas requires considering a number of processes that operate on scales beyond these accessible in this field experiment. Nevertheless, these results demonstrate the potential for reduced evapotranspiration and associated changes in hydrology in ecosystems dominated by woody vegetation in response to elevated Ca.

KW - Elevated CO

KW - Evapotranspiration

KW - Hydrology

KW - Soil water content

UR - http://www.scopus.com/inward/record.url?scp=0036117061&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036117061&partnerID=8YFLogxK

U2 - 10.1046/j.1365-2486.2002.00468.x

DO - 10.1046/j.1365-2486.2002.00468.x

M3 - Article

VL - 8

SP - 289

EP - 298

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 3

ER -