溶解有机物 (DOM) 的时空进化及其对环境因素和人类活动的反应
Mengyu Liu1, Haihan Tian1, Tao Chen2
1College of Geography and Environment, Shandong Normal University, Jinan, Shandong, PR China.
PloS one
|October 11, 2023
概括
季节性水转移项目,如南北水转移东部项目,影响支流水中的溶解有机物 (DOM). 水的转移减少了污染物,改变了DOM的组成,受化学氧气需求和营养水平等因素的影响.
科学领域:
- 环境科学 环境科学
- 水资源管理 水资源管理
- 分析化学 分析化学
背景情况:
- 南北转水东部项目 (SNWDP-E) 对中国的水资源分配至关重要.
- 附带的水质,特别是季节性水转移期间溶解有机物 (DOM) 的演变,仍未得到充分研究.
- 北达沙河 (NDR) 作为SNWDP内的水转移的关键部分.
研究的目的:
- 调查冬季水转移 (WT) 和夏季非水转移 (NWT) 期间NDR中DOM组成和光谱特征的变化.
- 阐明在季节性水转移条件下推动DOM演变的机制.
- 评估水转移对水质参数和DOM源的影响.
主要方法:
- 使用并行因子分析 (PARAFAC) 来分析DOM光特性.
- 冗余分析 (RDA) 和多重回归分析被用来确定影响DOM演变的因素.
- 测量了水质参数,包括氨 (NH4+-N),总 (TP),化学氧需求 (COD) 和总 (TN).
主要成果:
- 水转移显著降低了环境异质性,WT期间的NH4+-N和TP水平较低,与NWT相比,WT期间的NH4+-N和TP水平较低.
- 在WT期间,DOM光强度较低,来自稳定的内源源的湿性物质占主导地位.
- 在NWT期间,WT显示了受人类活动影响的独特DOM组合,其中蛋白质类成分与COD和NH4+-N相关,在NWT期间与TN和TP相关的类成分.
结论:
- 季节性水转移会改变支流系统中的水质和DOM组成.
- 在水转移和不转移期间,DOM进化是由不同的因素驱动的.
- 调查结果有助于了解盆地间转水项目的生态影响,并为管理策略提供信息.
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