. Carnegie Institution of Washington publication. 90 THE ECOLOGICAL RELATIONS OF ROOTS. Table 19.—Average daily evaporation on the gravel-slide and half-gravel-slide during 1918. Date. Gravel- slide. Half- gravel- slide. Date. Gravel- slide. Half- gravel- slide. June 6-10 July 15-22 July 22-29 July 29 to Aug. 5. .. Aug. 5-12 June 10-17 June 17-24 June 24 to July 1 July 1-8 Aug. 12-19 July 8-15 Aug. 19-23 One factor greatly accelerating evaporation is the m
. Carnegie Institution of Washington publication. 90 THE ECOLOGICAL RELATIONS OF ROOTS. Table 19.—Average daily evaporation on the gravel-slide and half-gravel-slide during 1918. Date. Gravel- slide. Half- gravel- slide. Date. Gravel- slide. Half- gravel- slide. June 6-10 July 15-22 July 22-29 July 29 to Aug. 5. .. Aug. 5-12 June 10-17 June 17-24 June 24 to July 1 July 1-8 Aug. 12-19 July 8-15 Aug. 19-23 One factor greatly accelerating evaporation is the marked wind movement. From June 6 to August 23 the average daily wind velocity at a height of m. was 103 miles. Notwithstanding the high evapora- tion losses, nearly all of which occur during the day, the upper layer of the soil containing the roots is kept moist by frequent rains. Seven- ^•i-:*. Fig. 37.—Quadrat-bisect showing root relations of gravel-slide plants. This was made along the front of the quadrat shown in plate 23, b. P, Paronychia jamesii; A, Aletes acaulis; K, Krynitzkia virgata. teen showers, varying in intensity from to inches, occurred from June 21 to August 28, 1918, while the total rainfall during the period was over 10 inches. As already pointed out, none of this water runs off except during the heaviest rains, while the loose gravel inhibits high evaporation losses. Moreover, the plants are so sparsely spaced that only relatively small amounts of water are removed by transpira-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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