| 单词 | nodum |
| 释义 | nodum Ecology.|ˈnəʊdəm|
Pl. noda.
[mod.L., perh. f. L. nōdus knot.]
(See quot. 1955.)
1955M. E. D. Poore in Jrnl. Ecol. XLIII. 243 The additional term Nodum has been introduced to apply to an abstract unit [of vegetation]..of uncertain status. Ibid. 259 The term nodum is being adopted to apply to abstract vegetation units of any category. It corresponds to the term taxon in systematics. Ibid., Both the Rhacomitrium-Carex bigelowii and the Nardus noda..are clearly defined communities. 1961Watsonia V. 76 The nodum is only developed on south- to west-facing slopes of 10 to 15°, fully exposed to wind and salt spray. 1971New Phytologist LXX. 1155 The noda are related to environmental factors. Ibid., A strongly marked relationship between the percentage of maritime species in a nodum and the sodium-organic ratio is noted. 1973H. J. B. Birks Past & Present Vegetation of Skye iv. 24/2 A community is any aggregation of plants constituting a certain spatial whole... It is regarded as synonymous with Poore's general term ‘nodum’. Ibid. 25/2 Where the vegetational unit is rather heterogeneous, it is termed a nodum. The word is italicised when it is used to refer to a specific vegetational unit that does not merit the rank of association. |
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