| 单词 |
hydrarch |
| 释义 |
hydrarch, a. Ecol.|ˈhaɪdrɑːk|
[f. Gr. ὕδωρ, ὑδρ- water + ἀρχή beginning.]
Of a succession of plant communities: having its origin in a watery habitat.
1913W. S. Cooper in Bot. Gaz. LV. 11 The terms xerarch and hydrarch are here used for the first time, for the purpose of indicating a natural and important classification of plant successions. The former is applied to those successions which, having their origin in xerophytic habitats, such as rock shores, beaches, and cliffs, become more and more mesophytic in their successive stages; the latter to those which, originating in hydrophytic habitats such as lakes and ponds, also progress towards mesophytism. 1929Weaver & Clements Plant Ecol. iv. 55 Successions beginning in ponds, lakes, marshes, or elsewhere in water are termed hydrarch. 1960N. Polunin Introd. Plant Geogr. xi. 324 They [sc. the seres] are distinguished as ‘hydrarch’, ‘mesarch’, or ‘xerarch’, according to whether their initiation is under damp, median, or dry conditions. |
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