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酸性化抵消了气候变暖引起的N₂O产量的增加,而河口和沿海沉积物中的N₂O产量则被抵消了

Xiaofei Li^1,2, Mengting Qi², Qiuxuan Li²

¹State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China.

Environmental science & technology

|March 5, 2024

概括

变暖会增加沉积物中的氧化 (N2O) 排放,但海洋酸化会抵消这种效应. 酸化将N2O产量从真菌转移到细菌,减少总体排放并减轻气候反.

科学领域:

环境科学环境科学
海洋生物学海洋生物学
生物地质化学生物地质化学

背景情况:

人为CO2排放导致全球变暖和海洋酸化,影响海洋生物地质化学循环.
在这些不断变化的条件下,沿海沉积物中产生氧化 (N₂O) 的机制尚不清楚.

研究的目的:

调查变暖和酸化对河口和沿海沉积物中N₂O生产途径的影响.
确定这些压力因素如何影响脱率和微生物群落.

主要方法:

进行了无毒化实验,以模拟变暖和酸化情景.
测量包括N₂O生产率,脱率,电子转移效率和微生物群体分析 (重点关注脱剂).

主要成果:

变暖通常刺激了N₂O的产生和脱.
酸化降低了N₂O生产,脱率和电子转移效率.
热化和酸化相结合,N₂O产量减少了26%,主要是由于真菌脱化产生的N₂O产量减少.
酸化将N₂O生产的主导地位从真菌转移到细菌脱,并减少了关键的*nirS*型脱剂的多样性和丰度.

结论:

酸化可以通过改变微生物通路和社区来减轻气候变暖引起的N₂O排放增加.
这表明在综合变暖和酸化情景下,气候反循环可能会减少.

关键词:

酸性化是一种酸性化过程.河口沉积物的沉积物在真菌脱化过程中,真菌脱.氧化是什么?氧化是什么?气候变暖导致的变暖

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