溶解有机物和其驱动因素的化学多样性取决于河流网络的大小,在多支流的山地河流中
Sisi Ye1, Huiyu Wen1, Chao Chang1
1College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China.
Water research
|September 18, 2025
概括
河流网络的大小和水质显著控制了溶解有机物 (DOM) 的多样性. 地理和水文因素塑造了DOM,城市化导致了更不稳定的化合物和导致同质化的高化.
科学领域:
- 环境化学环境化学
- 水生生态学 水生生态学
- 地质化学 地质化学
背景情况:
- 了解河流溶解有机物 (DOM) 的时空模式对于全球碳循环和水生生物健康至关重要.
- 在河流网络中,DOM化学多样性的地理分布和环境驱动因素尚不清楚.
研究的目的:
- 调查DOM分子和元素组成,化学多样性及其在汉江河上游网络中的环境驱动因素.
- 确定河流网络大小,树突距离,水质和流域特征对DOM的影响.
- 阐明控制DOM转换和空间异质性的机制.
主要方法:
- 在两个季节 (春季和秋季) 中,从132个地点收集样本.
- 使用里埃转换离子循环子共振质谱法 (FT-ICR MS) 进行分析.
- 整合地理,气候,水态地形,土地利用和水质数据.
- 结构方程建模的应用,以评估因素相互作用.
主要成果:
- 在纵向上,DOM的组成是稳定的,主要由类和CHO化合物占据主导地位.
- 河流网络的大小影响了DOM组成 (CHOS/CHONS与CHO/CHOP).
- 上游树突距离增加了DOM丰富性和功能多样性 (C/N比,AImod).
- 水质是DOM化学多样性的主要驱动因素;协同效应解释了分子变异.
- 地理和水文因素通过水质影响了DOM的功能多样性.
- 欧特罗菲地区显示DOM同质化;小型网络显示出更高的空间异质性.
- 森林覆盖的流域产生了反抗性的DOM;城市化将DOM转向了不稳定的化合物.
结论:
- 水质和地理/水文因素是DOM化学多样性和功能多样性的关键驱动因素.
- 河流网络的大小和流域土地使用 (森林与城市化) 显著改变DOM特征.
- 多因素相互作用模型对于预测河流系统中的DOM转变至关重要.
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