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盐度变化和溶解的有机碳对N₂O通过不同途径在盐湖中产生N₂O的对抗作用

Xiaoxi Sun¹, Beichen Wang¹, Jian Yang²

¹State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, China.

|July 4, 2025

概括

盐湖沉积物是氧化 (N2O) 的重要来源. 气候变化的影响,如清新和有机碳增加,通过改变微生物过程,特别是化和脱化,加剧N2O排放.

科学领域:

环境科学环境科学
微生物学微生物学
地质化学地质化学

背景情况:

盐湖面临由于气候变化的环境变化,影响盐度和有机物质.
盐湖的温室气体 (GHG) 排放估计是不确定的,因为人们对N2O生产途径的理解不足.
化和脱化是N2O生产的关键过程,受这些生态系统的环境变化影响.

研究的目的:

为了阐明盐湖沉积物中的N2O生产途径和速率,沿盐度梯度.
研究盐度和溶解有机碳 (DOC) 对化和脱化的影响.
评估气候变化对青海西藏高原 (QTP) 湖泊N2O排放的影响.

主要方法:

采用15N同位素标签来追踪N2O生产途径.
量化了参与循环的功能基因.
利用结构方程建模来分析环境因素与N2O生产之间的关系.

主要成果:

盐湖沉积物被确定为N2O生产的热点,化有显著的贡献 (平均43.51%,高达91.73%).
盐度一般会抑制N2O的产生,但DOC可以抵消这种效应,特别是在盐度高的环境 (>35g/L) 中.
低盐度系统显示脱抑制,而高盐度系统显示DOC刺激的脱和异质化,改变微生物群落.

结论:

气候驱动的清新和有机碳丰富协同增加盐湖N2O排放.
在盐水条件下,异质化变得越来越显著,与占主导地位的脱化一起.
受冰层影响的生态系统容易受到水文变化的影响,因此需要精细的温室气体库存,并对特定环境的N2O来源进行分区.

关键词:

气候变化气候变化气候变化溶解的有机碳溶解的有机碳 N (((2) O的生产途径盐酸湖泊盐酸湖泊盐酸湖泊盐分盐分盐分盐分盐分

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