| 释义 |
oligotrophic, a. Ecol.|ɒlɪgəʊˈtrəʊfɪk|
[ad. G. oligotroph (A. Thienemann Die Binnengewässer Mitteleuropas (1925) iv. 198 (-trophie n.), 200 (-troph)), f. Gr. ὀλίγος small, little + τροϕή nourishment: see -ic.]
Relatively poor in plant nutrients and (in the case of a lake) containing abundant oxygen in the deeper parts.
[1928Proc. Linn. Soc. CXL. 100 The typical oligotroph lakes are deep, with submerged beaches narrow or absent, inconsiderable or no littoral vegetation, and an indistinct littoral zonation.] 1931R. N. Chapman Animal Ecol. xvi. 304 The oligotrophic type of lake is rich in oxygen even to the bottom. It owes its characteristic partly to a geologic formation which permits relatively little inwash of organic material..; and partly to biotic conditions which do not favour rapid decomposition with the consequent oxygen consumption. 1943G. K. Fraser Peat Deposits of Scotland I. 3 The remains of plants nourished on rich soils (technically termed eutrophic soils)..will be able to support a greater bacterial population than those of plants grown on poor or impoverished soils (oligotrophic soils). Ibid. 9 Acid ground waters are usually oligotrophic and can support only short herbage such as smaller sedges. 1955New Biol. XVIII. 115 N. alba occupies a wide range of waters in the British Isles, from the oligotrophic, or nutrient-poor, peat-bottomed moorland lakes in Scotland and Ireland, to the eutrophic, or nutrient-rich, fen-lodes and broads of East Anglia. 1972J. G. Cruickshank Soil Geogr. vi. 186 Also acid and infertile is oligotrophic peat.
So ˈoligotrophy, an oligotrophic condition.
1928Proc. Linn. Soc. CXL. 109 Even if the natural course is from oligotrophy to eutrophy, the opposite process may also be found. 1957G. E. Hutchinson Treat. Limnol. I. ix. 644 Hutchinson set limits [on oxygen loss] of 0.017 mg. cm.-2 day-1 for oligotrophy. 1967[see eutrophy]. 1973P. A. Colinvaux Introd. Ecol. xviii. 258 It is the change from oligotrophy to eutrophy, simulating as it does the natural aging of a lake, which gives rise to the idea that polluted lakes are dying or actually dead. |