季节性缺氧增强了亚热带河流水库中沉积物中铁结合的释放
Fenfang Wang1, Jie Wang2, Taotao Cao2
1Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China.
The Science of the total environment
|May 18, 2024
概括
水库的季节性缺氧显著增加了沉积物中的释放,影响了水生生态系统. 这项研究揭示了低氧条件如何改变深水体中的循环和流量.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 临界技术 临界技术
背景情况:
- 在全球范围内,水有助于水库缩.
- 深水库的季节性缺氧是已知的,但其对底循环的影响还未得到充分研究.
研究的目的:
- 为了研究季节性缺氧对 (P) 循环和分数从水库沉积物中释放的影响.
- 了解从氧气到缺氧条件的过渡期间,沉积物-水界面 (SWI) 的P动态.
主要方法:
- 沉积物P分数使用顺序提取 (SEDEX) 方法进行测量.
- 使用薄膜 (DGT) 技术的扩散梯度分析了不稳定的P梯度.
- 测量是在从春季 (氧气) 到夏末 (低氧) 条件的过渡期间进行的.
主要成果:
- 沉积物P池主要由与铁结合的 (Fe-P,76-80%) 占据主导地位,与红色土壤有关.
- 有机P从春天增加到夏天.
- 在表面沉积物中,由于Fe-P的减少和硫化物生成,Labile P的增加 (春季为0-4厘米,夏季为0-1厘米).
- 由于高温和较低的氧气,在夏季SWI的酸盐流量较高.
结论:
- 季节性缺氧是影响深层水库中P循环和扩散的关键因素.
- 在缺氧下增强的P释放对水库生态和流域沿海生态系统管理有重大影响.
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