基于Meta分析的中国内陆水体沉积物产甲烷潜势驱动因子识别
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1.云南师范大学;2.北京师范大学;3.中国科学院重庆绿色智能技术研究院

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(42207089, 42311530334);云南省西南联合研究生院科技专项(202302AP370001);云南省科技厅社会发展重大专项(202203AC100002);云南省科技厅异龙湖高原浅水湖泊云南省野外科学观测研究站(202305AM070002)联合资助。


Identification of potential driving factors for sediment methanogenesis in Chinese inland waters based on meta-analysis
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1.Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes,Faculty of Geography,Yunnan Normal University;2.Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences

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    摘要:

    内陆水体是大气中温室气体甲烷的一个重要自然来源。沉积物在厌氧条件下的产甲烷潜势是决定水体甲烷排放规模的一个关键指标。然而,截止目前尚缺乏针对内陆水体沉积物产甲烷潜势的跨系统比较研究,对其驱动因子的认识尚不清晰。本研究收集了我国内陆水体包括水库、湖泊、河流和湿地的沉积物产甲烷潜势数据,结合部分未发表自有数据(共210条数据),探索了4种不同水体沉积物产甲烷潜势的时空分布,并识别了水环境因子对沉积物产甲烷潜势的驱动因子。研究发现,沉积物产甲烷潜势季节性明显,呈现雨季显著大于旱季态势(~3.5倍,p<0.01);拦河筑坝会导致沉积物的产甲烷潜势增加十倍以上,水库、湖泊沉积物产甲烷潜势显著(p<0.01)大于河流或湿地。相关分析表明,人类活动引起的水体富营养化对沉积物产甲烷潜势驱动作用显著(p<0.05),水温、水深、沉积物有机质含量均对沉积物产甲烷潜势有显著(p<0.01)正向刺激作用,而水体盐度对沉积物产甲烷存在显著(p<0.01)抑制作用。本研究表明,在全球气候变化这一背景下,预测未来内陆水体的碳排放,除去全球升温这一自然过程,一些强人类活动干扰诸如拦河筑坝、水体富营养化等过程也必须给予充分考虑。

    Abstract:

    Inland waters are an important natural source of methane to the atmosphere, a potent greenhouse gas. The potential of sediment methane production (PMP) under anaerobic conditions is a key indicator for the level of atmospheric emissions of methane. However, there is a lack of cross-system studies on the sediment PMP in inland waters. The underlying driving mechanisms are still unclear. In this study, we collected data on PMP in inland waters in China including reservoirs, lakes, rivers and wetlands. Combined with some unpublished data (a total of 210 data points), the temporal and spatial distribution of sediment PMP in several different systems was explored, and the drivers of the sediment PMP were identified. We found that PMP is seasonally variable, showing a trend of being significantly greater in the rainy season than in the dry season (~3.5 times, p<0.01)); damming causes a significant increase in PMP by more than ten times, and sediment PMP in reservoirs and lakes is significantly (p<0.01) greater than that of rivers or wetlands. Correlation analysis shows that eutrophication caused by human activities has a significant (p<0.05) driving effect on sediment PMP. Water temperature, water depth and sediment organic matter content have a significant (p<0.01) positive stimulating effect on sediment PMP, while salinity has a significant (p<0.01) inhibitory effect. In the context of global climate change, in order to make good future projections of carbon emissions from inland waters, human disturbances such as damming and eutrophication must be well incorporated, in addition to the natural process of global warming.

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  • 收稿日期:2024-12-14
  • 最后修改日期:2025-07-22
  • 录用日期:2025-03-18
  • 在线发布日期: 2025-04-18
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