采集区和湖泊网络改变了北极淡水中的无氧氧化能力的出口
Jouni Lehtoranta1, Antti Taskinen1, Petri Ekholm1
1Finnish Environment Institute, Latokartanonkaari 11, 00790 Helsinki, Finland.
The Science of the total environment
|August 9, 2023
概括
酸盐 (NO3),铁 (Fe) 和硫酸盐 (SO4) 的季节性流量显著影响北极湖泊的无氧氧化能力 (AOC),影响碳循环和温室气体形成.
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:
- 像酸盐 (NO3),铁 (Fe) 和硫酸盐 (SO4) 这样的无氧终端电子受体 (aTEAs) 对于无氧呼吸和有机碳氧化是至关重要的.
- 了解aTEA流的季节性和湖泊特异性动态及其对北极系统无氧氧化能力 (AOC) 的贡献是有限的.
研究的目的:
- 26年来,在两个相互连接的北极湖泊中量化NO3,Fe和SO4的季节性和湖泊特异性流量.
- 确定这些aTEA对有机碳的无氧氧化能力 (AOC) 的贡献.
- 调查湖泊特征和流域动态如何影响aTEA出口和随后的AOC.
主要方法:
- 汇编和分析了26年的aTEA进口数据,两个北极湖泊的池和出口数据.
- 计算NO3,Fe和SO4的平均每日流量.
- 根据出口数据,评估每个aTEA在总AOC中所贡献的比例.
主要成果:
- 酸盐 (NO3) 出口在夏季/秋季为AOC总量贡献了2-3%,在冬季/春季则高达11%.
- 铁 (Fe) 在湖的季节性AOC出口中占15-31%,主要来自湖底.
- 一个下游的清水湖以硫酸盐 (SO4) 的形式出口了87-95%的AOC,保留了大部分Fe. 每年的SO4:Fe:NO3对AOC的出口比例为10:3:1 (化物) 和15:0.4:1 (清水).
结论:
- 采集区和湖泊网络造成NO3,Fe和SO4出口的空间和时间变化,影响AOC.
- aTEA出口中的这些自然变化可以显著改变湖泊系统的碳氧化能力.
- 在AOC的影响变化对氧化还原变化,营养循环和下游环境中的温室气体生产的抗性.
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