在较低的福克斯河-绿湾的热带梯度沿着光DOM组件的明显变化,使用一个样本PARAFAC方法的特征
Hui Lin1, Sarah L Bartlett2, Laodong Guo3
1School of Freshwater Sciences, University of Wisconsin-Milwaukee, 600 E. Greenfield Ave., Milwaukee, WI 53204, USA; Polar Research Institute of China, 1000 Xuelong Road, Pudong, Shanghai 201209, China.
The Science of the total environment
|August 6, 2023
概括
福克斯河 - 绿湾溶解的有机物显示出清晰的河源,在横流沿线质量发生变化. 光成分各不相同,表明有机物成分和可变性从河流到海湾的变化.
科学领域:
- 环境化学环境化学
- 水上科学 水上科学
- 有机地化学 有机地化学
背景情况:
- 溶解有机物 (DOM) 在水生生态系统中起着至关重要的作用,影响营养循环和碳运输.
- 了解DOM的组成和可变性对于管理河湖界面的水质至关重要.
- 福克斯河 - 格林湾系统是一个季节性过度缩的环境,具有动态的水质变化.
研究的目的:
- 为了研究DOM在河流到海湾横断线上的分子重量分布和光元件的变化.
- 描述DOM源和质量变化在下方的福克斯河-绿湾.
- 评估单样PARAFAC方法在分析DOM.的有效性.
主要方法:
- 合流场流分化 (FFF) 用于尺寸分离,使用光刺激-发射矩阵 (EEM) 和 PARAFAC 分析.
- 使用单样PARAFAC方法进行详细的DOM表征.
- 测量溶解有机碳和的度,染色体DOM和特定的紫外线吸收.
主要成果:
- DOM质量,以降低DOC,DON和特定紫外线吸收率来表示,显示出强烈的河流源和横流沿线的显著变化.
- 体DOM (>1 kDa) 在散装DOM中保持相对恒定的比例 (71%),尽管其度下降.
- 光成分有所变化,类似的成分 (C475,C410) 从河流到海湾减少,而类似蛋白质的成分 (C320,C290) 增加.
结论:
- DOM的组成和质量受到河源的强烈影响,并经历了河口环境的动态变化.
- 耐火像DOM (C475) 的相对丰度是保守的,而半性像DOM (C410) 的相对丰度在海湾的方向下降.
- 类似蛋白质的DOM组件向海湾增加,这表明本土生产并反映了食用梯度. 一个样本的PARAFAC方法在DOM分析中被证明是有效的.
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