溶解的有机碳可以改变沿海沉积物的动态:不同碳形式和度的影响
Shuo-Nan Ma1, Xu-Meng Dong1, Ji-Lin Xu1
1School of Marine Sciences, Ningbo University, Ningbo, 315832, China.
Chemosphere
|December 11, 2024
概括
溶解有机碳 (DOC) 影响沿海 (P) 释放不同,取决于它的形式. 像乙酸和葡萄糖一样,不稳定的DOC增加了P的释放,而湿酸保留了它,影响了营养动态.
科学领域:
- 环境化学环境化学
- 海洋科学 海洋科学
- 生物地质化学生物地质化学
背景情况:
- 沿海水域面临着日益增加的溶解有机碳 (DOC) 负载,其复杂性和分子量各不相同.
- 这些DOC变化可以显著影响水生生态系统中的 (P) 动态.
- 了解DOC在沉积物P释放中的作用对于管理沿海水质至关重要.
研究的目的:
- 调查P释放的现场模式,以应对在中国山港的DOC输入.
- 阐明不同DOC形式影响沉积物P释放的机制.
- 评估不同DOC度和类型对沿海P动态的影响.
主要方法:
- 在山港进行了现场调查.
- 使用沿海沉积物进行了为期两个月的中宇宙实验.
- 添加了乙酸,葡萄糖和酸 (可变性和耐火DOC) 在0,5,10和20毫克C L−1.1.
主要成果:
- 沉积物P释放与DOC输入非线性增加,受DOC形式的影响.
- 性DOC (乙酸盐,葡萄糖) 促进了P的释放,而酸治疗显示了P的保留.
- 不稳定DOC的机制包括减少溶解氧,增加P-溶解细菌和性酸酶活性.
结论:
- DOC的形式和度极大地控制了沉积物P在沿海水域的释放和保留.
- 性DOC通过微生物和地化学途径增强P的释放.
- 耐火酸可以通过形成稳定的复合物来抑制P的释放,帮助P的分离.
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