| 单词 | root pressure |
| 释义 | > as lemmasroot pressure root pressure n. [after German Wurzelkraft ( J. von Sachs Handb. der Experimental-Physiologie der Pflanzen (1865) IV. vii. 198), lit. ‘root force’] Botany the hydrostatic pressure generated in the roots of a plant, which helps the sap to rise in the xylem. ΘΚΠ the world > plants > part of plant > root > [noun] > root pressure root pressure1875 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. iii. i. 600 (caption) Apparatus for observing the force with which water escapes under root-pressure from the transverse section of a stem. a1933 J. A. Thomson Biol. for Everyman (1934) II. 1220 At two atmospheres the water would be raised by this root pressure to a height of only about seventy feet, and many trees are much higher. 2009 Plant Biol. 10 604 Refilling of the xylem occurs by a dual mechanism: from the base (by root pressure) and from the top (by hydrostatic pressure generated by xylem-bound osmotic pressure). < as lemmas |
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