Water use of three hardwood species under variable CO[sub 2] and soil water conditions

Conference · Wed Jun 01 04:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7162294

Hanson, P J; Tscaplinkski, T J; Stewart, D B; Norby, R J ^[1]

---

1. Oak Ridge National Laboratory, TN (United States)

The impacts of elevated CO[sub 2] and cyclic water stress on water use of American sycamore (Platanus occidentalis L.), sweetgum (Liquidambar styraciflua L.) and sugar maple (Acer saccharum Marsh.) were evaluated. One-year-old seedlings were planted in 8-L pots and grown in four open-top chambers containing either ambient or ambient +3-- [mu]mol mol[sup [minus]1]CO[sub 2]. Soil moisture regimes were nested within each chamber. Well-watered plants were watered daily and water-stressed plants were exposed to drought cycles. Differences in plant leaf area and conductance between species altered the rate of water use, such that sycamore plants experienced 11 drought cycles whereas sweetgum and maple only had 5. Mean soil matric potentials at the depth of the drought cycles were [minus]1.5, [minus]0.7, and [minus]0.5 MPa for sycamore, sweetgum, and maple, respectively. Leaf-level gas exchange measures agreed with direct gravimetric observations not reduced under elevated CO[sub 2] because of increased leaf area production. Drought reduced total water use per plant and leaf, but did not preclude the CO[sub 2] effects on water use.

• OSTI ID: 7162294
• Report Number(s): CONF-940894--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 75:2
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
ECOLOGICAL CONCENTRATION
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MAPLES
MOISTURE
OXIDES
OXYGEN COMPOUNDS
PLANTS
SOILS
SWEET GUMS
SYCAMORES
TREES
VARIATIONS
WATER USE