农业用盐水中反应性中间体形成的机制
Xinyi Wang1, Jiyang Liu2, Songyang Li1
1State Key Laboratory of Black Soils Conservation and Utilization, Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Changchun 130102, China.
盐水中反应性中间体 (RIs) 的形成对于营养循环至关重要. 外源溶解有机物显著影响基生成,影响环境管理策略.
科学领域:
- 环境化学环境化学
- 水生化学 水生化学
背景情况:
- 反应性中间体 (RIs) 在生物地球化学循环和污染控制中发挥着至关重要的作用.
- 它们在化农业水域的行为,特别是在米种植中,还不太清楚.
- 性-性环境对水质和生态过程提出了独特的挑战.
研究的目的:
- 调查来自盐区的水中米种植中的反应性中间体的形成途径和影响因素.
- 为了确定不同来源的贡献,如酸盐,酸盐和溶解有机物 (DOM),基 (•OH) 形成.
- 阐明DOM特征 (光指数,本土指数,芳香度,分子量) 与RI生产之间的关系.
主要方法:
- 来自中国盐地区的米种植水的实地采样.
- 测量反应性中间体,包括单氧和基 (•OH).
- 分析水的参数,如pH值,盐度,亚酸盐,酸盐和溶解有机物特性 (光指数,本土指数,芳香含量,分子量).
主要成果:
- 单一氧气表现出比基基 (•OH) 更高的pH敏感性.
- 三重激发状态溶解的有机物对盐度的敏感性更大.
- [•OH]ss与酸盐和酸盐度有很强的相关性.
- 化物,酸盐和DOM的光解对OH形成分别贡献了19.50%,6.93%和73.57%.
- [RIs]ss与光指数正相关,与本土指数负相关,表明外源DOM作为主要来源.
- [•OH]ss与DOM芳香含量和分子量有关.
结论:
- 外源溶解有机物是这些盐水中反应性中间体的主要来源.
- 包括芳香度和分子量在内的DOM结构显著影响基生成.
- 了解这些形成路径对于在类似的水生系统中有效的生态恢复和环境管理至关重要.
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