• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global Biogeochemical Cycles >Influence of water depth on the carbon sequestration capacity of seagrasses
【24h】

Influence of water depth on the carbon sequestration capacity of seagrasses

机译：水深对海草固碳能力的影响

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

The actual estimates of carbon stocks beneath seagrass meadows worldwide are derived from few data, resulting in a tendency to generalize global carbon stocks from a very limited number of seagrass habitats. We surveyed Posidonia oceanica and Posidonia sinuosa meadows along depth-induced gradients of light availability to assess the variability in their sedimentary organic carbon (C_(org)) stocks and accretion rates. This study showed a fourfold decrease in C_(org) stocks from 2–4m to 6–8m depth P. sinuosa meadows (averaging 7.0 and 1.8 kgm~(-2), respectively; top meter of sediment) and a fourteenfold to sixteenfold decrease from shallow (2 m) to deep (32 m) P. oceanica meadows (200 and 19 kgm~(-2) average, respectively; top 2.7m of sediment). The average C_(org) accretion rates in shallow P. sinuosa meadows were higher (10.5 gm~(-2) yr~(-1)) than in deeper meadows (2.1 gm~(-2) yr~(-1)). The reduction of sedimentary C_(org) stocks and accretion rates along depth-related gradients of light reduction suggests that irradiance, controlling plant productivity, meadow density, and sediment accretion rates, is a key environmental factor affecting C_(org) storage potential of seagrasses. The results obtained highlighted the exceptional carbon storage capacity of P. oceanica meadows at Balearic Islands (Spain), containing the highest areal C_(org) stocks of all seagrasses (estimated in up to 691–770 kgm~(-2) in 8–13m thick deposits). Seagrass communities are experiencing worldwide decline, and reduced irradiance (following e.g., eutrophication or sediment regime alterations) will lead to photoacclimation responses (i.e., reduced plant productivity and shoot density), which may impact the carbon sequestration capacity of seagrasses.
机译：全世界的海草草甸下的碳储量的实际估算是从很少的数据得出的，导致有一种趋势，即从数量非常有限的海草生境中概括全球的碳储量。我们沿深度诱导的光利用率梯度调查了海洋波塞冬草和波西多尼亚草草甸，以评估其沉积有机碳（C_（org））储量和吸积率的变化。这项研究表明，C_（org）储量从2–4m减少到6–8m深度的中华P草地（分别为7.0和1.8 kgm〜（-2）;沉积物的最高米）减少了14倍至16倍从浅层（2 m）到深层（32 m）的海生草地（平均分别为200和19 kgm〜（-2）;沉积物顶部2.7m）。浅景天草甸的平均C_（org）增生率（10.5 gm〜（-2）yr〜（-1））比深层草甸的平均C_（org）高（2.1 gm〜（-2）yr〜（-1））。 。沿深度相关的减光梯度，沉积C_（org）储量和吸积率的降低表明辐照度，控制植物生产力，草甸密度和沉积物积聚率是影响海草C_（org）储存潜力的关键环境因素。获得的结果突显了巴利阿里群岛（西班牙）大洋云杉草甸的非凡碳存储能力，其中包含所有海草中最高的面积C_（org）储量（估计在8–8年内可达691–770 kgm〜（-2））。 13m厚的沉积物）。海草群落正在全球范围内减少，辐照度降低（例如富营养化或沉积物变化）将导致光适应性反应（即植物生产力和枝条密度降低），这可能会影响海草的固碳能力。

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