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基于主要离子和多个稳定同位素的大型水域中溶解无机碳来源和动态的评估

Wenming Pei¹, Xing Chen², Mingzhu Zhang¹

¹Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment (MEE), Nanjing, 210042, Jiangsu, China. zhangmingzhua2024@163.com.

Environmental science. Processes & impacts

|March 9, 2026

概括

在长江区分人类影响与自然过程.

科学领域:

环境科学环境科学
地质化学地质化学
水文学的水文学

背景情况:

巨大的河流在区分人为影响与自然碳循环方面面临着挑战.
碳同位素 (δ13C_DIC) 是理解这些复杂相互作用的关键标记物.
传统的水化评估往往掩盖了这些关键细节.

研究的目的:

为了研究长江地表水 (YRSW) 的水化学和稳定同位素 (δD, δ18O, δ13C_DIC).
量化自然和人为来源对溶解无机碳 (DIC) 的贡献.
揭示长江流域DIC和 δ13C_DIC的空间差异化模式.

主要方法:

在干旱季节在YRSW中对水化学和稳定同位素 (δD, δ18O, δ13C_DIC) 的分析.
应用石化测量和同位素分析来识别DIC来源.
使用与全球流星水线相对的同位素特征对水源的评估.

主要成果:

降水是主要的水源,受到大陆和海拔效应的影响.
长江作为二氧化碳净来源,平均pCO2高.
由土壤二氧化碳驱动的碳酸气候在DIC占主导地位,但人为因素影响中低流域.

结论:

人类造成的硫酸/酸气候变化和有机物氧化显著影响了长江下游的DIC.
这项研究为长江流域的DIC和 δ13C_DIC提供了第一个系统的空间分析.
这些发现为人类活动影响的大河流中碳循环提供了新的视角.

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