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研究受人类活动直接干扰较小的高山湖泊沉积物产甲烷(CH4)潜势及其主要驱动因子，为探究自然过程影响下高山湖泊CH4产生与排放的驱动机制提供依据。2022年7月选取云南老君山3个小型高山湖泊(太极湖、姐湖和三玄湖)，调查沉积物的CH4产生及排放水平，分析沉积物孔隙水中电子受体浓度(SO42-、NO3~-，金属离子Fe3+、总Mn等)以及有机质含量对湖泊沉积物CH4净产率的影响。结果表明：3个高山湖泊CH4排放水平[0.12～1.21 mmol/(m2·d)]总体偏低，较低的水温以及较高的氧化比例(78.40%～84.88%)是导致沉积物产CH4潜势偏低的主要原因；产CH4潜势均在沉积物表层5 cm偏高，且都呈现随沉积物深度增加而下降的趋势；3个湖泊沉积物均存在不同程度的CH4厌氧氧化现象，Fe3+、Mn、SO42-、NO3~-作为电子受体均可能参与了CH4厌氧氧化过程；沉积物有机质含量对产CH4潜势无显著驱动作用，但沉积物表层15 cm内有氮素富集的趋势，这可能是表层沉积物产CH4潜势偏高的原因。
Abstract：Alpine lakes, rarely affected by human activities, are ideal for studying the mechanisms of lake methane(CH4) production and emission on natural environmental change. In this investigation, three small alpine lakes(Taiji Lake, Jiehu Lake and Sanxuan Lake) on Laojunshan Mountain, Yunnan Province were selected for case study. Sediment CH4 production and primary driving factors were explored to better understand CH4 generation and emission. In the summer of 2022, we monitored routine water quality parameters, assessed sediment CH4 production and measured CH4 emission fluxes at the water-air interface. We also examined the influence of electron acceptors(SO42-, NO3~-, Fe3+) and total Mn in sediment porewater, and the effect of sediment organic content on sediment CH4 production. Net CH4 emissions in all three lakes were low [0.12-1.21 mmol/(m2·d)], attributed primarily to low water temperatures(14.66-16.09 ℃) and high dissolved oxygen levels(78.40%-84.88% saturation). In all three lakes, CH4 production was relatively high in the top 5 cm of sediment and decreased as sediment depth increased. Anaerobic oxidation of CH4 occurred in the sediment to varying degrees, with Fe3, SO42-, NO3~- and total Mn potentially acting as electron acceptors in the oxidation process. Sediment organic content did not significantly affect sediment CH4 production, but there was nitrogen enrichment in the top 15 cm of sediments that could contribute to the higher CH4 production observed in the surface sediments. These results contribute to our understanding of CH4 dynamics in Alpine Lakes.
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基本信息:
DOI：10.15928/j.1674-3075.202309150254
中图分类号:X143
引用信息:
[1]范雨春,刘流,刘智,等.云南小型高山湖泊沉积物产甲烷潜势及其驱动因素[J].水生态学杂志,2026,47(02):78-88.DOI:10.15928/j.1674-3075.202309150254.
基金信息:
云南省西南联合研究生院科技专项（202302AP370001）; 云南省基础研究计划项目面上项目（202401AT070132）; 国家自然科学基金项目(42207089,42311530334); 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）