藻类颗粒沉积和生物化的协同作用放大了内部负荷
Fengrui Zhang1, Lixian Tan2, Wenxuan Han1
1Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 211135, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Water research
|July 18, 2025
概括
像Limnodrilus hoffmeisteri这样的盆地生物动湖泊沉积物,恶化低氧和由藻类衰变引起的内部负荷. 管理湖泊需要考虑生物化,特别是在藻类繁殖密集的地区.
科学领域:
- 环境科学 环境科学
- 水生生态学 水生生态学
- 地质化学 地质化学
背景情况:
- 藻类繁殖导致颗粒沉积和分解,导致沉积物-水界面 (SWI) 的缺氧.
- 谷底生物,如Limnodrilus hoffmeisteri,在低氧条件下壮成长,可以扰乱已定位的藻类颗粒.
- 这种干扰可以影响营养循环,特别是SWI的 (P) 交换.
研究的目的:
- 研究藻类颗粒分解和生物化对湖泊内负荷的综合影响.
- 了解地生物的活动如何影响低氧条件下的P释放.
主要方法:
- 对藻类颗粒分解和Limnodrilus hoffmeisteri存在的实验操纵.
- 在沉积物-水界面上监测氧气水平,氧化还原敏感 (Fe-P) 和有机 (Org-P).
- 对低氧和P释放的协同效应的分析.
主要成果:
- 由L. hoffmeisteri的生物化最初增加了沉积物的氧化,但持续的藻类分解加深了缺氧.
- 藻类降解和盆地动物衰变的联合作用协同增强了SWI的无氧条件.
- 对氧敏感的P (Fe-P) 溶解是主要的P释放途径,有机P (Org-P) 分解在较长的时间尺度上有显著的贡献.
- 藻类有机物影响Fe-S-P循环,促进硫酸盐的减少,并通过生物化加速Org-P矿化.
结论:
- 生物化通过加速有机P矿化和促进整个SWI的P释放,显著提高了内部P负荷.
- 优质湖中的有效管理必须考虑到生物化,特别是在藻积累较高的沿海地区.
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