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从沿海沉积物中释放的机制是由高度的有机物丰富驱动的

Chun-Pu Zhao¹, An-Hao Wang¹, Ying Zeng¹

¹School of Marine Sciences, Ningbo University, Ningbo, 315832, China.

Marine pollution bulletin

|December 19, 2025

概括

沿海地区的高和有机物污染大大增加了沉积物中的释放. 这通过再悬浮,减少氧化还原潜力,增强有机矿化,增加扩散,推动环氧化发生.

科学领域:

海洋生态海洋生态学
生物地质化学生物地质化学
环境科学环境科学

背景情况:

沿海污染,标志着高 (N) 和有机物 (OM) 的输入,显著影响海洋 (P) 循环.
对于OM介导的P释放现有的陆地模型对动态沿海环境的适用性有限.

研究的目的:

研究有机物 (OM) 丰富对高 (N) 负荷下沿海沉积物中 (P) 释放的影响.
阐明推动人为影响沿海地区P释放的关键机制.

主要方法:

进行了为期三个月的中宇宙实验,使用来自山港 (东中国海) 的沉积物.
在高N负荷下,应用了6个OM含量的梯度 (6-24gkg-1).
用零碎结构方程建模来分析P释放的贡献因素.

主要成果:

OM丰富显著增强了沿海沉积物P释放,这种效应在较高的OM度下最明显.
确定的主要驱动因素包括沉积物再悬浮,减少促进无氧P脱氧的氧化还原潜力,增强有机P矿化 (phoD基因上调,性酸酶活性增加) 和酸盐扩散的升高.
这些因素共同解释了P增幅变化的92%.

结论:

和OM丰富增加了沿海沉积物中的P可用性,有助于持续的环氧化.
对N,P和OM输入的综合管理策略对于缓解沿海优化至关重要.

关键词:

沿海生态系统的生态系统微生物重新塑造的微生物.营养丰富的营养丰富的动态的动态沉积物再悬浮的方法

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