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<p>While marine seagrass habitats are acknowledged as sinks for carbon and nutrients, much less is known about sequestration in brackish-water vegetation. Here, we quantify the amount of organic carbon (C<sub>org</sub>) and total nitrogen (TN) in shallow bay sediments (0–25&#xa0;cm) in the brackish Baltic Sea and assess how it varies with morphometric isolation from the sea, catchment characteristics and abundance of brackish-water vegetation. The sedimentary C<sub>org</sub> and TN content per surface area varied across the bay isolation gradient (mean C<sub>org</sub>: 2500–4600&#xa0;g/m<sup>2</sup>; mean TN: 320–570&#xa0;g/m<sup>2</sup>), with enclosed bays having the highest percentage content of C<sub>org</sub> and TN, but low sediment density (&lt;&#xa0;0.1&#xa0;g cm<sup>3</sup>), while open bays had more compact sediment with lower percentage content of C<sub>org</sub> and TN. The influence of catchment and vegetation characteristics on the sediment C<sub>org</sub> and TN content was less clear, suggesting that coastal morphology affecting hydrodynamic exposure is an important determinant of C and TN accumulation in brackish-water bays. The results show that morphometrically isolated shallow coastal areas constitute significant sinks for carbon and nitrogen, which should be considered in management and in any regional estimates of blue carbon and nutrient sequestration functions.</p>

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Influence of landscape characteristics and submerged aquatic vegetation on sediment carbon and nitrogen storage in shallow brackish water habitats

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月6日

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  • Sofia A. Wikström,
  • Betty Gubri,
  • Maria E. Asplund,
  • Martin Dahl,
  • Martin Gullström,
  • Joakim P. Hansen,
  • Linda Kumblad,
  • Emil Rydin,
  • Andrius Garbaras,
  • Mats Björk

摘要

While marine seagrass habitats are acknowledged as sinks for carbon and nutrients, much less is known about sequestration in brackish-water vegetation. Here, we quantify the amount of organic carbon (Corg) and total nitrogen (TN) in shallow bay sediments (0–25 cm) in the brackish Baltic Sea and assess how it varies with morphometric isolation from the sea, catchment characteristics and abundance of brackish-water vegetation. The sedimentary Corg and TN content per surface area varied across the bay isolation gradient (mean Corg: 2500–4600 g/m2; mean TN: 320–570 g/m2), with enclosed bays having the highest percentage content of Corg and TN, but low sediment density (< 0.1 g cm3), while open bays had more compact sediment with lower percentage content of Corg and TN. The influence of catchment and vegetation characteristics on the sediment Corg and TN content was less clear, suggesting that coastal morphology affecting hydrodynamic exposure is an important determinant of C and TN accumulation in brackish-water bays. The results show that morphometrically isolated shallow coastal areas constitute significant sinks for carbon and nitrogen, which should be considered in management and in any regional estimates of blue carbon and nutrient sequestration functions.