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首页 > 过刊浏览>2022年第14卷第1期 >21-31. DOI:10.13878/j.cnki.jnuist.2022.01.003
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藻型湖泊溶解有机碳特征及其对甲烷排放的影响
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X524

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国家自然科学基金(41801093,4197 1309)


Characteristics of dissolved organic carbon in algal-dominated lake and its influence on methane emission
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    摘要:

    湖泊碳通量研究已成为全球碳循环研究的前沿和热点问题.本研究以太湖藻型湖区(西北湖区、梅梁湾、贡湖湾、西南湖区和湖心)为研究对象,基于为期一年的连续野外观测,旨在揭示富营养化湖泊DOC变化特征及其对CH4排放的影响.结果表明,太湖藻型湖区DOC质量浓度均值为4.15 mg/L,且具有显著的空间变化.受外源输送和内部蓝藻增殖影响,西北湖区和梅梁湾DOC质量浓度较高,且其DOC时间变化与流域降雨量紧密相关,尤以西北湖区最为明显(R2=0.67,P<0.01).但在受外源输送影响较小的湖心区域,其DOC的时间变化主要受蓝藻生物量驱动(R2=0.60,P<0.01).太湖藻型湖区CH4排放均值为0.083 mmol·m-2·d-1,不同湖区CH4排放量差异明显.藻型湖区较高的蓝藻生物量显著提高了CH4的排放量,且DOC含量是蓝藻影响CH4产生和排放的主要因子.总体上,太湖藻型湖区DOC的累积致使其是CH4排放的热点区域,但DOC对CH4产生和排放的影响受湖泊内部因子和外部因子的综合调控,其潜在的控制机制还需要进一步探讨.

    Abstract:

    The carbon cycle in lakes has been receiving great concerns and has become a hot issue.This study aimed at investigating the characteristics of Dissolved Organic Carbon (DOC) and its influence on methane emission based on continuous field sampling in a year cycle from algal-dominated zones of Lake Taihu.Results showed that the DOC with mean value of 4.15 mg/L varied spatially due to external input and internal algal blooms.Overall,peak DOC occurred in Northwest Zone and Meiliang Bay,and temporal variations of DOC in the two zones were associated with basin precipitation,especially for Northwest Zone (R2=0.67,P<0.01).It should be noted that the temporal variation of DOC in Central Zone were highly positively correlated with algal biomass mostly due to the less external input.The CH4 diffusion emission flux with mean value of 0.083 mmol·m-2·d-1 varied greatly across zones.Algal blooms significantly stimulated the CH4 emissions via increasing DOC concentration.Overall,the algal-dominated lake was a hot spot of CH4 emission due to DOC enrichment.Considering the effects of DOC on lake CH4 emission was regulated by multiple factors related to internal metabolic activities and external loading,further studies are needed to reveal the potential control mechanism.

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肖启涛,廖远珊,刘臻婧,胡正华.藻型湖泊溶解有机碳特征及其对甲烷排放的影响[J].南京信息工程大学学报(自然科学版),2022,14(1):21-31
XIAO Qitao, LIAO Yuanshan, LIU Zhenjing, HU Zhenghua. Characteristics of dissolved organic carbon in algal-dominated lake and its influence on methane emission[J]. Journal of Nanjing University of Information Science & Technology, 2022,14(1):21-31

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  • 收稿日期:2021-12-08
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