热岩溶
环境科学
高原(数学)
永久冻土
土地覆盖
甲烷
碳纤维
总有机碳
北极的
自然地理学
水文学(农业)
环境化学
土地利用
大气科学
地质学
海洋学
生态学
地理
化学
材料科学
有机化学
数学分析
数学
岩土工程
复合数
复合材料
生物
作者
Cuicui Mu,Mei Mu,Xiaodong Wu,Jenshan Lin,Chengyan Fan,Xiaoqing Peng,Chien‐Lu Ping,Qingchuan Wu,Cunde Xiao,Jianbao Liu
摘要
Abstract Thermokarst lakes are potentially important sources of methane (CH 4 ) and carbon dioxide (CO 2 ). However, considerable uncertainty exists regarding carbon emissions from thermokarst lakes owing to a limited understanding of their patterns and motivators. In this study, we measured CH 4 and CO 2 diffusive fluxes in 163 thermokarst lakes in the Qinghai–Tibet Plateau (QTP) over 3 years from May to October. The median carbon emissions from the QTP thermokarst lakes were 1440 mg CO 2 m −2 day −1 and 60 mg CH 4 m −2 day −1 , respectively. The diffusive rates of CO 2 and CH 4 are related to the catchment land cover type. Sediment microbial abundance and hydrochemistry explain 51.9% and 38.3% of the total variance in CH 4 diffusive emissions, respectively, while CO 2 emissions show no significant relationship with environmental factors. When upscaling carbon emissions from the QTP thermokarst lakes, the annual average CH 4 release per lake area is equal to that of the pan‐Arctic region. Our findings highlight the importance of incorporating in situ observation data with different emission pathways for different land cover types in predicting carbon emissions from thermokarst lakes in the future.
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