A portable apparatus for estimating stomatal aperture in confiers
William Lopushinsky, Pacific Northwest Forest and Range Experiment Station (Portland, Or.), United States. Pacific Northwest Forest and Range Experiment Station, Portland, Oregon
Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1969 - Nature - 7 pages
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48-percent and 67-percent 57-percent alcohol solution 95-percent concentration 95-percent ethanol Alaska alcohol concentration aperture in conifer average infiltration pressure calculated stomatal conifer needles considered fully open current-year needles Douglas-fir needles dyne per centimeter end point essentially closed estimating stomatal aperture estimating stomatal opening ethanol-water mixture exploded view field-grown Froeschel Fry and Walker fully open stomata further drying hour of drying infiltration occurred infiltration often occurs Infiltration pressure increased infiltration values large number lecture bottle Lower alcohol measure of stomatal mechanisms of stomatal midrange of closure needle and later needle chamber needle holder O-ring opening in conifers Oregon p. s. i. or less partially closed stomata Plexiglas point more difficult polyethylene washer ponderosa pine needles portable apparatus portions of needles Portland pressure-infiltration method range of infiltration release valve sample of needles shoot stomata in older stomata in younger stomatal movement stomatal widths surface tension Swauk transpiration rate weighed wider degree