Effects of changing stomatal width in a red pine forest on soil water content, leaf water potential, bole diameter, and growth. [Pinus resinosa Ait]
Spraying a 16 meter tall stand of red pine (Pinus resinosa Ait.) with 10/sup -3/ M phenylmercuric acetate in early June and again in mid-July resulted in the water use between June 1 and October 25 being reduced by almost 10%. It was demonstrated that this was caused by an increase in the leaf resistance with partial stomatal closure, which reduced absolute water potential in the needles by 1 to 3 bars in the middle of the day. Smaller demands were made upon the reserves of water in the bole of the tree as shown by the smaller bole contraction in the treated trees. Although needle length and dry weight were unaffected by the spray, radial growth was reduced by approximately 32%. The dependence of leaf resistance on light intensity is shown, and its independence from leaf water potential discussed.
- Research Organization:
- Connecticut Agricultural Experiment Station, New Haven
- OSTI ID:
- 5319191
- Journal Information:
- Plant Physiol.; (United States), Vol. 43
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC MERCURY COMPOUNDS
BIOLOGICAL EFFECTS
PLANT GROWTH
INHIBITION
TRANSPIRATION
DAILY VARIATIONS
EXPERIMENTAL DATA
MOISTURE
PINES
SEASONAL VARIATIONS
SOILS
STOMATA
CONIFERS
DATA
GROWTH
INFORMATION
MERCURY COMPOUNDS
NUMERICAL DATA
OPENINGS
ORGANIC COMPOUNDS
PLANTS
TREES
VARIATIONS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)