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在湖泊沉积物中控制和原始化效应的意义

Maciej Bartosiewicz^1,2, Anna Przytulska¹, Axel Birkholz¹

¹Department of Environmental Sciences, University of Basel, Basel, Switzerland.

Global change biology

|January 26, 2024

概括

变暖和环氧化加快了湖泊沉积物中旧碳的分解. 这种原始效应释放出大量的温室气体,影响全球碳预算.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

变暖和环保变化改变了沉积碳 (C) 处理,影响了全球温室气体预算.
虽然已知温度对碳的损失的影响,但新鲜有机物 (FOM) 的原始化机制尚不清楚.

研究的目的:

评估气候变暖,环氧化和有机物质 (OM) 石化学如何影响沉积物中的原始化程度.
在模拟的未来气候场景下调查FOM诱导的甲 (CH4) 生产和微生物群落转移.

主要方法:

在模拟加热 (+4°C和+8°C) 条件下,用13C标记的FOM化沉积物.
分析FOM诱导的CH4产量和微生物群落组成.
评估OM体积测量 (C/N比率) 和FOM与微生物生物质 (FOM/MB) 的比率.

主要成果:

沉积物C损失在异地沉积物中高达17%,在本土沉积物中高达6%.
化大小取决于OM静态度,FOM/MB比率和温度,在FOM/MB<50%时,在4°C时最强.
添加FOM刺激了细菌分解剂 (例如,Firmicutes,Bacteroidetes),表明复杂的生物聚合物的降解.

结论:

在异地沉积物中的耐火OM比本土OM更容易受到原始化的影响.
全球多达35%的湖泊主要由异沉积 (C/N > 15) 形成.
由于植物浮游生物质的增加,这些湖泊中的反抗性OM每年可能释放高达2.1TgC,这会影响长期的碳埋葬.

关键词:

气候变化肥胖化气候变化肥胖化蓝藻细菌是一种蓝藻细菌.碳湖碳湖是一个碳湖.甲基生物的产生.引发效应的原始化效应沉积物石化学沉积物石化学

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