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从巨型植物主导的湖泊系统向藻类主导的湖泊系统的过渡增强了沉积物中的释放

Xiangyu He¹, Wenming Yan¹, Xiang Chen²

¹The National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing, 210098, China; College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.

|February 5, 2025

概括

化的湖泊从植物转变为藻类,增加了沉积物中的释放. 这种藻类的优势增强了 (As) 的释放,带来了需要进一步研究的潜在风险.

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:

环氧化湖中的巨型植物数量下降改变了沉积物质循环.
对于 (As) 作为对这些变化的反应的转变,人们对其了解甚微.

研究的目的:

为了研究的转化和从沉积物中释放在巨型植物主导 (MD) 和藻类主导 (AD) 的区域.
分析沉积物A 分割和环境变化之间的关系.

主要方法:

使用高分辨率透析测量沉积物孔水中溶解的As.
沉积物从季节性地采集了在优质湖中的MD和AD区域的沉积物样本.

主要成果:

从MD到AD区域的转变显著增强了AS释放.
在夏季的AD沉积物中,由于氧化铁 (Fe) 减少和 (P) 竞争,溶解的 (120.36μg/L) 峰值出现.
春季MD沉积物表现出显著的As释放 (34.92μg/L),这是由于巨生物残留分解和有机物 (OM) 复杂化.

结论:

优食性湖中的藻类占主导地位加剧了释放的风险.
沉积物条件,包括氧化还原潜力和化,影响As fate,MD沉积物通过共同降水在夏季将As封存起来.
了解这些动态对于管理水生生态系统中污染至关重要.

关键词:

藻占主导地位的湖泊.随着溶解而解散的大型植物占主导地位的湖泊.沉积物沉积物是一种沉积物.

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