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陆地溶解有机物输入伴随着溶解氧耗尽和pH值下降加剧了来自中国一个主要水库的CO2排放

Ting Zhang¹, Lei Zhou², Yongqiang Zhou¹

¹Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; College of Nanjing, University of Chinese Academy of Sciences, Nanjing, 211135, China.

|January 26, 2024

概括

陆地溶解有机物 (DOM) 的输入减少了湖中的溶解氧 (DO) 和pH,同时增加了二氧化碳 (CO2) 排放. 这项研究量化了这些效应在中国的川湖.

科学领域:

环境科学环境科学
临界技术临界技术
生物地质化学生物地质化学

背景情况:

陆地溶解有机物 (DOM) 的投入显著影响水生生态系统.
DOM的降解会影响溶解氧 (DO) 和pH.
DOM,DO,pH和二氧化碳 (CO2) 排放之间的联系仍未得到充分研究.

研究的目的:

调查陆地DOM输入与丹湖二氧化碳排放之间的关系.
评估DOM如何影响主要饮用水库中的DO和pH水平.
为了量化每年的二氧化碳从湖中流出.

主要方法:

在江湖100个地点每月实地采样 (2020年5月至2021年4月).
测量DOM特征 (SUVA254,C2,FDOM),DO,pH和同位素组成.
年度二氧化碳排放量 (FCO2) 的估计.

主要成果:

年度二氧化碳排放量估计为37.2 ± 29.0 gC m-2 yr-1.
随着DO,叶绿素a和δ2H-H2O的减少,二氧化碳排放量增加.
二氧化碳排放与特定的紫外线吸收率 (SUVA254) 和陆地米类C2正相关.
随着陆地DOM指标的增加,DO和pH下降了 (SUVA254,C2).
垂直配置文件显示,随着陆地DOM光 (FDOM),CO2部分压力 (pCO2) 增加,而DO,pH和δ13C-CO2下降.

结论:

陆地DOM输入是湖泊生态系统中物理化学变化的关键驱动因素.
DOM燃料来自湖泊的大量二氧化碳排放,影响水生生地化学.
研究结果强调了管理陆地DOM输入对于水库健康和碳循环的重要性.

关键词:

的二氧化碳 (CO2) 排放量.溶解有机物 (DOM) 是一种有机物.溶解的氧气 (DO) 是一种在FT-ICR MS中使用.奇安道湖 (Qiandao湖) 是一个湖泊.它们的pH值为pH.

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