碳池的不稳定性是由多个溶解有机物来源驱动的,在一个有机湖盆地:温室气体排放增加的潜在因素
Jie Ma1, Muchun Zhou2, Yu Peng3
1Ministry of Ecology and Environment, Nanjing Institute of Environment Sciences, Nanjing, 210042, China.
Journal of environmental management
|November 30, 2023
概括
太湖流域多个河流来源的溶解有机物 (DOM) 增加了碳排放. 混合这些复杂的DOM类型加快有机碳分解,影响湖泊.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 临界技术 临界技术
背景情况:
- 湖泊对于溶解有机物 (DOM) 的储存和碳循环至关重要.
- 淡水DOM的来源和组成以及它们对湖泊沉积碳的影响尚不清楚.
研究的目的:
- 调查多源DOM输入对太湖盆地沉积碳池稳定性的影响.
- 分析DOM成分及其与碳成分和温室气体排放的关系.
主要方法:
- 在太湖流域中选择了七条流入的河流进行DOM分析.
- 量化溶解有机碳,木质素和酸度.
- 分析了沉积碳,溶解甲 (CH4) 和二氧化碳 (CO2) 之间的相关性.
- 进行了混合DOM分解的实验,以评估有机碳矿化.
主要成果:
- 在太湖盆地观察到DOM的高度和复杂性.
- 质素占DOM的40%以上,酸占有有机碳含量的主导地位.
- 沉积碳与溶解的CH4和CO2正相关,特别是酸和CH4 (R2 = 0.86).
- 混合DOM加速有机碳矿化,具有最高的单位碳排放效率 (160.9 μmol·Cg−1).
结论:
- 多种来源的DOM输入显著影响湖泊碳池动态,作为增加碳排放的驱动因素.
- 复杂的DOM成分有助于提高温室气体水平.
- 这些发现为完善湖泊碳排放评估提供了基础.
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