光生物降解驱动水库表面层中有机物介导的碳--硫循环:多指数分析
Haoyang Wang1, Xinyu Lao1, Khan M G Mostofa1
1Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China.
Environmental research
|December 3, 2025
概括
阳光和微生物活动协同调节水库中的溶解有机物 (DOM) 和碳--硫 (C-N-S) 循环. 这项研究揭示了光暗周期如何推动DOM的营业额,影响C-N-S周期和水库对气候变化的反应.
科学领域:
- 环境化学环境化学
- 水生生态学 水生生态学
- 生物地质化学生物地质化学
背景情况:
- 溶解有机物 (DOM) 动力学和联碳--硫 (C-N-S) 循环在级联水库中的理解很少.
- 光化学和微生物过程相互作用来调节这些循环,特别是在地表水中.
研究的目的:
- 系统地检查DOM动态和C-N-S循环在阳光和黑暗条件下在水库表面水域.
- 阐明光化学和微生物过程对DOM转化和营养循环的协同效应.
- 在水库中开发C-N-S循环的综合模型.
主要方法:
- 在阳光和黑暗条件下使用未过和过的水库水进行了为期30天的实验.
- 三维光 (EEM) 与平行因子分析 (EEM-PARAFAC) 结合用于DOM表征.
- 用于营养循环分析的同位素技术 (δ15N-NO3-, δ18O-NO3-) 和SO42-测量.
主要成果:
- 阳光通过植物浮游生物光吸和光降解诱导溶解有机碳 (DOC) 脱,导致高温下DOC增加.
- 微生物在黑暗中的呼吸显示了不同的DOM利用和储库特异性.
- 在光暗周期下植物浮游生物的产生和光降解导致DOC的损失最小,但有机硫的矿化显著转化为硫酸盐 (SO42-).
- 酸盐 (NO3-) 转化是通过结合植物浮游生物同化和化来调节的.
结论:
- 光暗循环是DOM周转和水库中C-N-S循环的关键驱动因素,调节浮游植物和微生物过程.
- 储水池充当影响DOM组成和转变的反应器,对生物地质化学循环产生重大影响.
- 结果提供了基于过程的洞察力,了解水库对气候变化的反应及其在全球C-N-S周期中的作用.
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