| 释义 |
chresard Ecol.|ˈkriːsɑːd|
[f. Gr. χρῆσ-ις use + ἄρδ-ειν to water.]
That portion of the water of the soil that is available for vegetation.
1905F. E. Clements Res. Methods in Ecol. ii. 32 The total amount of water in the soil is divided into the available and the non-available water-content. The terms suggested for these are..holard..chresard..and echard. 1926Tansley & Chipp Stud. Vegetation vii. 127 If the echard is subtracted from the holard..the difference is called the chresard (the fraction of the holard which the plant can actually use). 1938Weaver & Clements Plant Ecol. (ed. 2) viii. 203 Obviously the available water or chresard (amount for use) differs for different soils. |