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溶解有机物出口的化学多样性从亚热带潮湿流域出口,由水文连接驱动

X D Hu¹, Y W Deng¹, C Zhou¹

¹State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan, 430070, PR China.

|June 20, 2024

概括

水文连通性显著控制了来自水域的溶解有机物 (DOM) 出口. 增加的连接性大大提高了碳出口,特别是缩的芳和化物,有助于碳储存管理.

科学领域:

环境科学环境科学
水文学的水文学
地质化学地质化学

背景情况:

溶解有机物 (DOM) 的出口与水文连接有关.
根据水文连接性对流域DOM出口的监管尚未完全理解.

研究的目的:

调查水文连接如何影响DOM出口的数量和分子组成.
量化描述水文连接,考虑表面和地下流动路径.

主要方法:

在一个亚热带潮湿的流域,在20个月内对地下水和下水进行高频监测.
水文连接的定量表征.
使用里埃转换离子循环子子共振质谱法 (FT-ICR MS) 分析DOM分子组成.
统计建模 (部分最小平方-结构方程建模) 来评估关系.

主要成果:

超过一半的水域在降雨期间缺乏与溪流的持续水文连接.
素,素和蛋白质是DOM的主要组成部分,陆地材料增加了DOM的芳香度.
水文连接直接影响了溶解有机碳 (DOC) 的出口,DOC,素和缩芳香化合物的非线性增加超过了特定的连接值.
没有发现水文连接性和不稳定的DOM成分 (如脂质和碳水化合物) 之间的显著相关性.

结论:

水文连接是对DOM出口数量和质量的关键控制.
特定DOM组件对连接性的非线性反应突出显示了复杂的出口动态.
这些发现为优化碳储存的水域管理策略提供了信息.

关键词:

溶解的有机物质是有机物质.在FT-ICR-MS中使用.水文连接性水文连接性分子组成分子构成降雨后的下水流量是什么

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