...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecological research >Crown hollowing as a consequence of early shedding of leaves and shoots
【24h】

Crown hollowing as a consequence of early shedding of leaves and shoots

机译：叶片和茎条过早脱落导致冠部凹陷

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

Leafing pattern has long been considered as an important element characterizing the growth strategy of tree species; however, the consequences of leafing pattern for tree-crown formation have not been fully understood. To address this issue, the dynamic events (growth, birth, and death) of current-year shoots and leaves were investigated together with their location in saplings of a pioneer tree, Alnus sieboldiana. The leafing pattern was characterized by successive emergence and shedding of short-lived leaves. The combination of successive leafing and within-crown variation in leaf production brought about characteristic outcomes in crown morphology. In the outer crown, because of continuous leaf production, the shoots achieved great extension and enormous daughter shoot production, resulting in rapid expansion of the crown. In contrast, in the inner crown, due to early termination of leaf production, the shoots completely lost their leaves early in the growing season and consequently themselves died and were shed within the season. Such quick shedding of shoots caused "crown hollowing", i.e., the interior crown consisted of primary branches with little secondary development or foliage. These dynamic features are an effective adaptive strategy in early succession but also may be a disadvantage to maintaining foliage for longer period. Crown maintenance associated with the longevity of structural components is thought to play an important role in survival strategy of tree species.
机译：长期以来，叶子模式一直是表征树木生长策略的重要元素。然而，树冠形成的叶子模式的后果还没有被完全理解。为了解决这个问题，调查了当年芽和叶的动态事件（生长，出生和死亡），以及它们在先锋树Alnus sieboldiana的幼树中的位置。叶片模式的特征是短寿命叶片的连续出现和脱落。叶片连续生叶和冠内变异的结合带来了冠状形态的特征性结果。在外冠中，由于连续不断的叶片生产，枝条获得了极大的延伸，子枝的产量也大大增加，从而导致了冠的迅速膨胀。相反，在内冠中，由于叶片生产的早期终止，因此在生长季节的早期，枝条完全失去了叶子，因此它们自身死亡并在该季节脱落。芽的这种快速脱落引起“冠穴”，即内部冠由几乎没有次级发育或枝叶的主要分支组成。这些动态特征是早期演替的有效适应策略，但也可能不利于长期保持枝叶。人们认为，与树木构件的寿命相关的树冠维护在树木的生存策略中起着重要作用。

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