Blue carbon stocks in Baltic Sea eelgrass ( Zostera marina ) meadows
Blue carbon stocks in Baltic Sea eelgrass ( Zostera marina ) meadows
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DOI：
10.5194/bg-13-6139-2016
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发表时间：
2016-11
期刊：
影响因子：
4.9
通讯作者：
M. Röhr;C. Boström;P. Canal-Vergés;M. Holmer
中科院分区：
文献类型：
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作者：
M. Röhr;C. Boström;P. Canal-Vergés;M. Holmer
抽象的。尽管海草仅覆盖海洋海底的一小部分，但其碳汇能力占海洋碳埋藏总量的近五分之一，因此在许多沿海生态系统中发挥着关键的结构和功能作用。我们采样了10个在芬兰和10个在丹麦的海草（大叶藻滨海）草甸，探讨在波罗的海地区的海草碳储量（Corg股票）和碳积累率（Corg积累）。研究地点代表了两个区域从隐蔽地点到暴露地点的梯度，以反映预期的最低和最高存量和积累。在芬兰，沉积物顶部25 cm处的Corg储量平均为627 g C m−2，而在丹麦，Corg储量平均高出6倍（4324 g C m−2）。据保守估计，这些区域的总有机碳库在6.98至44.9吨碳公顷之间。我们的研究结果表明，芬兰的鳗草草甸是轻微的碳汇相比，丹麦的草甸，和大多数的Corg在芬兰的草甸生产的出口。我们的分析进一步表明，Corg储量的变化有40%以上是由沉积物特性，即干密度、孔隙度和泥沙含量解释的。此外，分析还表明，Z. marina解释了> 12%，Z.沉积物表面Corg池的码头碎屑解释了> 10%的Corg储量变化。芬兰和丹麦的鳗草草地目前碳储量和碳汇能力的平均货币价值分别为281和1809欧元/公顷。为了更全面地了解海草的碳储存能力，我们得出结论，未来的蓝碳研究应该以一种更综合的方式，调查沉积物地球化学，海景结构，植物物种结构和水动力机制之间的相互作用。
Abstract. Although seagrasses cover only a minor fraction of the ocean seafloor, their carbon sink capacity accounts for nearly one-fifth of the total oceanic carbon burial and thus play a critical structural and functional role in many coastal ecosystems. We sampled 10 eelgrass (Zostera marina) meadows in Finland and 10 in Denmark to explore seagrass carbon stocks (Corg stock) and carbon accumulation rates (Corg accumulation) in the Baltic Sea area. The study sites represent a gradient from sheltered to exposed locations in both regions to reflect expected minimum and maximum stocks and accumulation. The Corg stock integrated over the top 25 cm of the sediment averaged 627 g C m−2 in Finland, while in Denmark the average Corg stock was over 6 times higher (4324 g C m−2). A conservative estimate of the total organic carbon pool in the regions ranged between 6.98 and 44.9 t C ha−1. Our results suggest that the Finnish eelgrass meadows are minor carbon sinks compared to the Danish meadows, and that majority of the Corg produced in the Finnish meadows is exported. Our analysis further showed that > 40 % of the variation in the Corg stocks was explained by sediment characteristics, i.e. dry density, porosity and silt content. In addition, our analysis show that the root : shoot ratio of Z. marina explained > 12 % and the contribution of Z. marina detritus to the sediment surface Corg pool explained > 10 % of the variation in the Corg stocks. The mean monetary value for the present carbon storage and carbon sink capacity of eelgrass meadows in Finland and Denmark, were 281 and 1809 EUR ha−1, respectively. For a more comprehensive picture of seagrass carbon storage capacity, we conclude that future blue carbon studies should, in a more integrative way, investigate the interactions between sediment biogeochemistry, seascape structure, plant species architecture and the hydrodynamic regime.