在城市河流中DOM的光谱分辨率受到不同非点源强度的影响,使用自组织地图
Xincheng Jin1, Xiaoqing Chen2, Liangmin Gao2
1School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
概括
季节性变化和非点源污染显著改变城市河流中的溶解有机物 (DOM). 夏季观察到较高的 humification 和分子质量,受营养投入和污染水平的影响.
科学领域:
- 环境化学环境化学
- 分析水质 分析水质
- 频谱技术 频谱技术的使用
背景情况:
- 城市河流因非点源输入而面临复杂的水质挑战.
- 溶解有机物 (DOM) 组成是水生生态系统健康的关键指标.
- 了解季节性DOM动态对于有效的水资源管理至关重要.
研究的目的:
- 调查DOM成分和城市河流中的度的季节性变化.
- 评估不同非点源输入对DOM特征的影响.
- 阐明营养在驱动DOM转换中的作用.
主要方法:
- 使用了UV-Vis和三维激发发射矩阵光谱 (EEMs).
- 应用自组织地图 (SOM) 和主要组件分析 (PCA) 用于数据解释.
- 在春季和夏季采样期间,在两个城市河流中分析了DOM.
主要成果:
- 与春季相比,DOM在夏季表现出较高的湿度和相对分子量 (P < 0.01).
- SOM分析揭示了与非点源输入强度和季节相关的明显光模式.
- 营养丰富 (,) 与自生过程的增加有关.
结论:
- 季节性变化和非点源输入对城市河流水质有重大影响 (R2 = 0.775,P < 0.001).
- 增加的非点源输入提高了土类分数,并促进了自身生成.
- DOM特征是城市水生环境中人为压力的敏感指标.
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