| 词汇 | poplar |
| 释义 | poplar noun[ C ] uk /ˈpɒp.lər/ us /ˈpɑː.plɚ/ a tall tree with branches that form a thin pointed shape: 白杨树 a tall row of poplars一排高大的白杨树 DNY59/E+/GettyImages Deciduous trees acacia acer ailanthus alder almond fringe tree ginkgo hawthorn honey locust hornbeam quaking aspen red maple red oak rowan rubber tree wayfaring tree weeping willow white ash white birch white oak poplar | American Dictionarypoplar noun[ C ] us/ˈpɑp·lər/ a tall, straight, fast-growing tree with soft wood Examples of poplarpoplar The trembling poplar shelterbelt trees make movement audible. In practice, knowledge of the developmental genetic basis of growth is crucial to increasing the efficiency of early selection in poplar. Considerable non-additive genetic variation observed in the triploid poplar population seems to disagree with these traditional views. From year 14, strong competitive interactions occur among poplar trees due to the closure of canopies. The wood normally used for the roof beams is juniper or poplar. But this is at best a sapling or a medium-sized poplar. In this study, we do not know # whether this is the same major gene that affects height and diameter growth in the poplar hybrids. When canopies close, strong competitive interactions occur among poplar trees in the stand. Continuous infusion is the most poplar technique (54.3% of units) whereas 47.9% of units use intermittent top-ups. Poplar trees and sunflower are typically light-demanding plants and have high photosynthetic capacity. Thus, an understanding of the genetic mechanisms underlying wood stem production in poplar should be integrated with the biological process of growth and development. Unlike crop annuals, poplar is long-lived and needs many years to achieve harvest ages in the field. Yield physiology of short rotation intensively cultured poplars. Under such unfavourable conditions, maples might look just like oaks or poplars to most observers, though perhaps trained botanists could find features by which to identify them properly. Several forest tree species, such as conifers, poplar, sweet gum and eucalypts, have been bioengineered, but they have not so far been released for commercial purposes. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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