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沿海降解调节了在沉积物-水界面上的可用性和扩散动力学:机制和环境影响

Minjie Hu¹, Ruibing Yan², Ranxu Ni²

¹Key Laboratory of Humid Sub-tropical Eco-geographical Processes of Ministry of Education, Fujian Normal University, Fuzhou 350117, China; School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China; Wetland Ecosystem Research Station of Minjiang Estuary, National Forestry and Grassland Administration, Fuzhou 350215, China.

|January 3, 2024

概括

沿海的退化减少了沉积物,增加了其释放到上面的水域. 这加快了营养损失,损害了水质,需要进行保护和恢复工作.

科学领域:

环境科学环境科学
地质化学地质化学
生态生态学生态生态学

背景情况:

全球沿海湿地面临着严重的损失和退化.
连接沿海退化与亚热带生态系统中沉积物转化的机制尚不清楚.

研究的目的:

调查沿海退化如何影响沉积物 (P) 调动和扩散.
阐明沿降解梯度P转换的基本机制.

主要方法:

使用薄膜 (DGT) 和Peeper技术的高分辨率扩散梯度季节性现场测量.
应用DGT诱导的沉积物流 (DIFS) 模型来模拟P流.
从原始湿地到严重退化的沿海湿地的梯度的分析.

主要成果:

沉积物P随着沿海降解而减少,严重降解的地点显示可用的P度较低.
沿海地区的退化显著增加了可溶性P和可溶性反应性P (SRP) 度,特别是在严重退化的地区.
尽管看起来像是P沉没,但严重退化的地点表现出加速的P扩散和重新移动到上层水域,由DIFS模型模拟证实.

结论:

沿海降解通过增加补给能力和扩散动力学来增强沉积物P重新移动到孔水和上层水域.
由于降解而加速的营养损失会对周围生态系统的水质产生不利影响.
包括保护,恢复和管理在内的缓解策略对于减少内部P负荷和保持区域营养平衡至关重要.

关键词:

沿海地区的退化.在DGT-Peeper-DIFS中使用.扩散动力学的扩散动力学.在P重新调动的过程中.水的质量水的质量

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