...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Botany >Relationship between vessel porosity and leaf emergence pattern in ring- and diffuse-porous deciduous trees in a temperate hardwood forest
【24h】

Relationship between vessel porosity and leaf emergence pattern in ring- and diffuse-porous deciduous trees in a temperate hardwood forest

机译：温带硬木林中环和散射多孔树木血管孔隙率与叶片出现模式的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To elucidate the functional relationship between intra-annual variations in vessel diameter and leaf emergence pattern of ring-porous and diffuse-porous deciduous trees in temperate forests, we determined the temporal relationships between leaf phenology and vessel formation. Cylindrical stem cores were periodically collected from each of five ring-and diffuse-porous species, and the leaf and vessel formation were observed simultaneously. In the ring-porous species, vessel formation began within 2 weeks of leaf appearance, and most wide vessels were formed within 2 weeks of full leaf expansion. More of the trees with intermediate-type formed medium-sized vessels or sparse wide vessels than trees with the flush-type leaf emergence, especially between full leaf expansion and the end of shoot elongation. Narrow vessel formation began 2-8 weeks after full leaf expansion in all specimens. The transition between the pore-and non-pore zones was abrupt in the flush-type species, and gradual in the intermediate-type species. In contrast, diffuse-porous species formed vessels 0-8 weeks after full leaf expansion. Our findings suggest that ring-porous species form leaves and vessels synchronously to accommodate water-transport requirements, whereas diffuse-porous species form these tissues asynchronously; thus, unlike the latter type, the former species change vessel diameters according to leaf formation.
机译：为了阐明温带森林中环多孔和漫射多孔落叶树的血管直径和叶片出苗模式的年内变化之间的功能关系，我们确定了叶候和血管形成之间的时间关系。从五个环和漫射多孔物种中的每一个周期地收集圆柱形杆芯，同时观察叶片和血管形成。在环多孔物种中，血管形成始于叶片外观的2周内，并且在全叶膨胀的2周内形成大多数宽血管。更多的树木具有中间型形成的中型血管或稀疏的宽度，具有含有含有绒型叶片出现的树木，特别是在全叶膨胀和射击伸长率结束之间。在所有标本中全叶膨胀后2-8周开始窄血管形成。孔隙和非孔隙区之间的过渡在含水型物质中突然，中间型物种逐渐逐渐。相比之下，全叶膨胀后0-8周的漫射多孔物种形成血管。我们的研究结果表明，环多孔物种同步形成叶子和血管以适应水运要求，而漫射多孔物种异步形成这些组织;因此，与后一种类型不同，前者物种根据叶片形成改变血管直径。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号