| 单词 | heart-root system |
| 释义 | > as lemmasheart-root system b. A large, obliquely descending tree root, as contrasted with a vertical taproot or a horizontal root. Frequently attributive, esp. in heart-root system. ΘΚΠ the world > plants > part of plant > root > [noun] moreeOE rootc1175 master-rootc1330 rootinga1400 radix1558 leg1597 taproot1601 top-root1651 tuberous root1668 heart-root1669 pivot1725 spill1766 tap1796 tutty-more1873 pneumatophore1891 stem root1901 heart-root1903 1903 Science 17 Apr. 606/1 We recognize three types, with many gradations between them—the tap-root, the heart-root and the tracing root system. 1929 T. Thomson tr. M. Büsgen & E. Münch Struct. & Life Forest Trees ix. 269 The practical distinction tap root, heart root, and flat root thus gives pretty well the only architectural characteristics of its individuality which a root system taken as a whole retains. 1940 Jrnl. Ecol. 28 107 At eighty years shallow outgoing branches of the heart root comprised the greater part of the functional root system [in beech]. 1983 Vegetatio 52 60/1 From the base of the tree there were some thick heart roots which proceeded downwards at an angle of usually steeper than 45°. 2002 A. Stokes in Y. Waisel et al. Plant Roots: Hidden Half (ed. 3) x. 281 A large number of tree species possess heart root systems when mature, especially broadleaf species. < as lemmas |
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