| 释义 |
rhizosphere Bot.|ˈraɪzəʊsfɪə(r)|
[ad. G. rhizosphäre (L. Hiltner 1904, in Arbeiten der deutsch. Landwirtschaftsges. XCVIII. 69): see rhizo- and sphere n.]
The sphere of chemical and bacteriological influence of the roots of a plant.
1929R. L. Starkey in Soil Sci. XXVII. 319 The plants withdraw considerable amounts of substances (principally inorganic) from the rhizosphere.., and eventually introduce large amounts of organic matter to the soil in the form of their dead tissues. 1956Nature 4 Feb. 221/1 A small epiphytic fern..common not only on trunks and branches, but also having a tendency to settle on leaves, to which it attaches itself by spreading roots and root hairs... Fungi living in the rhizosphere of the fern infect the tree-support and cause the die-back of the branches. 1972J. G. Cruickshank Soil Geogr. vi. 175 At all sites, plant roots have a rhizosphere, created by their excreted organic solutions and maintained by vast numbers of organisms. 1976Jrnl. R. Soc. Arts CXXIV. 583/2 In some tropical species there is an association of nitrogen-fixing bacteria in the rhizosphere (not actually in the root itself, in nodules, but around the root) which are believed to exchange nitrogen and carbohydrates with the plant. |