| 单词 | nitrogen cycle |
| 释义 | > as lemmasnitrogen cycle nitrogen cycle n. Biology the cycle of changes whereby nitrogen is interconverted between its free state in the air and combined states in organisms and the soil. ΘΚΠ the world > life > biology > balance of nature > environment or habitat > [noun] > sulphur or nitrogen cycle nitrogen cycle1906 sulphur cycle1967 1906 Science 12 Jan. 576/1 River waters differ from pond, lake of reservoir, waters in the essential particular that the former are in rapid motion and the so-called nitrogen cycle may take place several times during the course of their flow. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) IX. 111/2 The nitrogen cycle comprises the processes of ammonification, nitrification, denitrification, and nitrogen fixation. 1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) xi. 469 The continuous interchange of nitrogen between the atmosphere and the biosphere is called the nitrogen cycle. < as lemmas |
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