Water relations of populus clones
Stomatal aperture and water balance in the field of eight Populus clones varying in growth rate were closely related to environmental factors and clonal differences were clearly expressed. Leaf water potential (psi) was influenced by solar radiation, leaf conductance, evaporative demand, and soil moisture content. The effects of soil moisture on psi were greatly modified by atmospheric conditions and stomatal conductance. Several slow-growing clones exhibited extended periods of psi below that of rapidly growing clones, despite high evaporative demand and the much greater transpiring surfaces of the fast-growing clones. Stomata of all clones responded to changes in light intensity and vapor pressure gradient (VPG). Pronounced stomatal sensitivity to VPG of two rapidly growing clones of common parentage, and the resultant capacity of these clones to moderate water deficits under high evaporative demand, were associated with drought resistance in one of the parents. Seasonal maximum leaf conductance was positively related to growth in several clones, suggesting that rapidly growing clones possess the capacity to carry on higher rates of gas exchange under favorable conditions. Analysis of changes in psi with changes in transpirational flux density (TFD) showed that for four clones, psi change per unit change in TFD decreased as TFD increased, indicating plant adaptation for prevention of damaging psi even at high TFD. More rapidly growing clones exhibited a larger initial rate of decline in psi with TFD, but reduced the rate of decline more than slow-growing clones as TFD increased. (Refs. 41).
- Research Organization:
- Dept. of Forestry, Univ. of Wisconsin, Madison, Wisconsin 53706 USA
- OSTI ID:
- 5189482
- Journal Information:
- Ecology; (United States), Vol. 63:1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Seasonal trend of photosynthetic parameters and stomatal conductance of blue oak (Quercus douglasii) under prolonged summer drought and high temperature
A genomics investigation of partitioning into and among flavonoid-derived condensed tannins for carbon sequestration in Populus
Related Subjects
POPLARS
CLONING
PLANT GROWTH
BIOMASS
ENVIRONMENT
LEAVES
MORPHOLOGY
PHOTOSYNTHESIS
TRANSPIRATION
WATER VAPOR
WISCONSIN
CHEMICAL REACTIONS
ENERGY SOURCES
FEDERAL REGION V
FLUIDS
GASES
GROWTH
NORTH AMERICA
PHOTOCHEMICAL REACTIONS
PLANTS
RENEWABLE ENERGY SOURCES
SYNTHESIS
TREES
USA
VAPORS
140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)