. The water-balance of succulent plants. Desert plants; Plant ecology; Cactus. 24 THE WATER-BALANCE OF SUCCULENT PLANTS. remains soaked for weeks. Moreover, each plant seems to have a very definite Hmit beyond which it will not expand, no matter how much water it can Fig. 12.— Curves from measurements of three intervals on sahuaro No. i and one curve (o) showing combined variation of the three others. Effects of watering. November 28, 1908, to May 14, 1909. During the winter of 1904-05 the ground was wet much of the time from January 1 to April 15. If at any time between these dates a s
. The water-balance of succulent plants. Desert plants; Plant ecology; Cactus. 24 THE WATER-BALANCE OF SUCCULENT PLANTS. remains soaked for weeks. Moreover, each plant seems to have a very definite Hmit beyond which it will not expand, no matter how much water it can Fig. 12.— Curves from measurements of three intervals on sahuaro No. i and one curve (o) showing combined variation of the three others. Effects of watering. November 28, 1908, to May 14, 1909. During the winter of 1904-05 the ground was wet much of the time from January 1 to April 15. If at any time between these dates a sahuaro which had been deprived of water for some time had been transferred into this soil, it probably would have absorbed water and expanded rapidly. But the sahuaros which were already in the ground, while they responded promptly to the first rains, showed little or no expansion thereafter until the warm weather in May. In the following winters, 1905-06 and 1906-07, though less rain fell, the intervals reached practically the same size. But in the winters of 1903-04 and 1908-09 there was so little rain that the ground was not saturated long enough at any time for the intervals to reach their maximum expansion. These statements will be evident from table 5, which shows the greatest expansion attained by the three marked furrows of No. 1 for several 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 MacDougal, Daniel Trembly, 1865-1958; Spalding, E. S. Washington, D. C. , Carnegie Institution of Washington
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcactus, bookyear1910
