Certain Water Relations of the Genus PrunusLeland Stanford Junior University, 1926 - 524 pagina's |
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25 Sept amount of soil atmometer available moisture behavior of stomata Calculated hygroscopic coefficient Calculated moisture equivalent Calculated wilting coefficient California CHIG coeffi coefficient is shown curves show results Delhi dry soil plots dry soil tree dry weight basis fluctuation in water French prunes humidity are shown leaf leaves Length Width Length moist soil tree moisture content moisture in soil moisture on dry Mountain View Muir peaches O'to obtained at Davis opening of stomata Parkinsonia microphylla Percentage of moisture Percentage of soil relative amount relative humidity Results from trees samples were taken September 11 shaded tree show results obtained soil are shown soil moisture soil prune tree solid black column stomata in microns stomatal behavior stomatal movement stomatal opening Temperature and relative transpiration tree Dry soil trees in dry trees in moist unshaded portion upper curves show water content Width in Microns Width Length Width Width of stomata
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Pagina 480 - It becomes evident that the opening of the stomata is accompanied by a net loss of water by the leaf, more being given off by transpiration than can be obtained to replace it, as I have shown to occur by comparative volumetric and gravimetric determinations in Fouquieria splendens.\ The results of similar experiments with cotton may be said, in anticipation of their publication, to harmonize fully with those on Fouquieria. Concerning the relative behavior of young and old...
Pagina 480 - non-stomatal retardation of water loss appears to be continuously active until well into the night, its effects becoming mingled with those of stomatal closure at or about sunset. It appears that in the hours just preceding sunrise stomatal retardation seems to be alone manifest.
Pagina 480 - That the amount of available soil water has an important bearing on the rate of transpiration.
Pagina 480 - The curve of stomatal behavior follows the relative transpiration curve in such a manner that the existence of an interrelation is evident" (p. 63). Die Behauptung von Renner, daß Lloyd (523, 524) jetzt seinen Standpunkt „von Grund aus geändert -hätte", möchte ich nicht unterstützen; wenigstens habe ich aus der Lektüre seiner Arbeiten diesen Eindruck nicht gewonnen. In seinem Werke „Die Physik der Transpiration...
Pagina 512 - AM FIGURE 4. — Width of stomatal opening on prune trees, in moist soil and in dry soil at Mountain View, California, September 11, 1924. The relative amount of soil moisture above the wilting coefficient is shown by the solid black column and the relative amount of soil moisture below the hydroscopic coefficient is shown by the unshaded portion...
Pagina 513 - FIGURE 6. — Width of stomatal opening on leaves on different parts of strong shoots and on spurs on prune trees in moist soil and in dry soil at Davis, California, September 15, 1925. The relative amount of soil moisture above the wilting coefficient is shown by the solid black column, and the relative amount of soil moisture below the hydroscopic coefficient is shown by the unshaded portion the maximum degree of opening as those on leaves exposed to direct sunlight.
Pagina 500 - The succulent portions of the tree, ie, the leaves, and the terminal and basal portions of the twigs, showed a marked progressive decrease in water content during the early part of the season, which meant that these portions were increasing in dry matter.
Pagina 479 - it is not certain that we shall ever be able to deduce the size of stomata from readings of the porometer.