...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Biology >Effects of a small-bladed macroalgal canopy on benthic boundary layer dynamics: implications for nutrient transport.
【24h】

Effects of a small-bladed macroalgal canopy on benthic boundary layer dynamics: implications for nutrient transport.

机译：小叶片大型藻类冠层对底栖边界层动力学的影响：对营养物运输的影响。

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Field and laboratory velocity profiles were used to quantify boundary layer dynamics within communities of a small (<0.2 m tall), dense canopy-forming seaweed Adamsiella chauvinii (Rhodophyta) in a soft-sediment habitat and to examine the role of hydrodynamics in modulating nutrient supply. At the 'canopy scale' there was a mixing layer at the fluid-canopy interface where turbulent kinetic energy was greatest, potentially enhancing nutrient uptake in this region. In the lower half of the canopy, a drag-dominated area of very low water velocity (<0.01 m s-1) occurred. Spectral analysis revealed a reduction in energy within the canopy of around 1 Hz. The hydrodynamic parameters obtained from flume measurements were in good agreement with those recorded in the field. To understand the implications of the hydrodynamic environment on nutrient uptake, a flushing ratio was developed that compares the time for macroalgae to remove all nutrients from the canopy volume relative to the timescale for flushing. Results suggest that when nutrient demand is low, the canopy is well flushed and not mass-transfer limited. However when nutrient demand is high, the canopy can deplete nutrients more quickly than they can be replenished by ambient flows and are potentially mass-transfer limited.Digital Object Identifier http://dx.doi.org/10.3354/ab00369
机译：野外和实验室速度剖面用于量化软沉积物栖息地中小的（<0.2 m高），密集的，形成冠层的海藻 Adamsiella chauvinii （Rhodophyta）群落内的边界层动态，并进行检查流体动力学在调节养分供应中的作用。在“冠层尺度”上，在流体-冠层界面处有一个混合层，在该层中湍动能最大，可能增加该区域的养分吸收。在冠层的下半部分，出现了一个以拖曳为主的区域，水流速度非常低（<0.01 m s -1 ）。光谱分析表明，顶篷内的能量减少了约1 Hz。从水槽测量获得的流体力学参数与现场记录的流体力学参数非常吻合。为了了解水动力环境对养分吸收的影响，开发了冲水比，该冲水比将大型藻类从冠层容积中清除所有养分的时间与冲水的时间尺度进行了比较。结果表明，当养分需求量低时，冠层被充分冲洗并且不受传质限制。但是，当养分需求量很高时，冠层消耗养分的速度可能比环境流量补充养分的速度快，并且可能会限制传质。数字对象标识符http://dx.doi.org/10.3354/ab00369

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