rhizospheren.
/ˈrʌɪzəsfɪə/, U.S. /ˈraɪzəˌsfɪ(ə)r/ Botany and Ecology.
The region of the soil in the vicinity of plant roots, considered as a microenvironment in which the chemistry and microbiology is influenced by root growth, respiration, and nutrient exchange.
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rhizosphere1921
1921 F. E. Clements Aeration & Air-content i. 39 The carbon dioxid in the moor-soil is an ecological factor in so far as its amount furnishes a measure of the decomposition processes in the soil, modified through the higher or lower air-content of the rhizosphere and the nature of the soil material.
1929 Soil Sci. 27 319 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.
1956 Nature 4 Feb. 221/1 Fungi living in the rhizosphere of the fern infect the tree-support and cause the die-back of the branches.
1976 Jrnl. Royal Soc. Arts 124 583/2 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.
2005 Aggie Days 16 Mar. 15/3 ‘Earthworms take us through the soil and give us a tour of who's who in the soil and what's what in their food web,’ says Jill Clapperton, a rhizosphere ecologist with Agriculture and Agri-Food Canada.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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n.1921