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大型浅湖沉积物动态的时空变化:与氧化还原相关的内部负荷的机制和影响

Olga Tammeorg¹, Gertrud K Nürnberg², Ilmar Tõnno³

¹Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), FI-00014 Helsinki, Finland; Chair of Hydrobiology and Fishery, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia.

The Science of the total environment

|October 28, 2023

概括

从沉积物中释放的与氧化还原相关的显著影响浅湖水质,由温度和无氧驱动. 这项研究证实,与铁结合的,而不是有机,是Peipsi湖内部负荷的主要贡献者.

科学领域:

环境科学环境科学
临界技术临界技术
地质化学地质化学

背景情况:

在浅层多态湖中与氧化还原相关的沉积物 (P) 释放的作用尚不清楚.
之前在Peipsi湖的研究表明,与内部P负荷有关的氧化还原P释放的重要性.
有机沉积物P (Org-P) 往往被认为是优化湖中的内部P负载的主要贡献者.

研究的目的:

探索皮普西湖中与氧化还原相关的P释放假设的有效性,考虑有机沉积物P.
分析扩散P流和沉积物P形式的时空变化.
计算内部P负载 (IL) 并研究其与水质变量之间的关系.

主要方法:

使用P分离和核磁共振 (NMR) 光谱分析沉积物P形式.
测量扩散P流的时空变化.
使用两种方法计算内部P负荷 (IL) 并与水质数据 (1997-2021) 相对应.

主要成果:

沉积物表面的无氧和P释放随着水温的增加而增加.
长期IL估计与预测的沉积物表面无氧 (AApred) 相相关.
与铁结合的P (Fe-P) 与正酸盐相关,表明其对P释放的贡献,与Org-P的作用相矛盾.

结论:

主要来自Fe-P的Redox相关P释放是Peipsi湖内部P负荷的重要驱动因素.
有机物质含量支持还原性溶解,但Org-P本身不是释放的P的主要来源.
预测的无氧和内部P负荷与Secchi深度和叶绿素a.等关键水质指标密切相关.

关键词:

内部 (P) 负载核磁共振 (NMR) 光谱学核磁共振 (NMR) 光谱学有机P 有机P 有机与Redox相关的P释放浅浅的湖泊浅浅的湖泊结合铁的沉积物 P 沉积物 P

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.