title: Effects of permafrost thaw on carbon emissions under aerobic and anaerobic environments in the Great Hing'an Mountains, China.
abstract: The carbon (C) pool of permafrost peatland is very important for the global C cycle. Little is known about how permafrost thaw could influence C emissions in the Great Hing'an Mountains of China. Through aerobic and anaerobic incubation experiments, we studied the effects of permafrost thaw on CH4 and CO2 emissions. The rates of CH4 and CO2 emissions were measured at -10, 0 and 10°C. Although there were still C emissions below 0°C, rates of CH4 and CO2 emissions significantly increased with permafrost thaw under aerobic and anaerobic conditions. The C release under aerobic conditions was greater than under anaerobic conditions, suggesting that permafrost thaw and resulting soil environment change should be important influences on C emissions. However, CH4 stored in permafrost soils could affect accurate estimation of CH4 emissions from microbial degradation. Calculated Q10 values in the permafrost soils were significantly higher than values in active-layer soils under aerobic conditions. Our results highlight that permafrost soils have greater potential decomposability than soils of the active layer, and such carbon decomposition would be more responsive to the aerobic environment.
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
authors.forename: Changchun
authors.initials: C
authors.lastname: Song
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China. Electronic address: wangxw003@163.com.
authors.forename: Xianwei
authors.initials: X
authors.lastname: Wang
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Miao
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Jiaoyue
authors.initials: J
authors.lastname: Wang
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Mao
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
authors.forename: Yanyu
authors.initials: Y
authors.lastname: Song
mesh_terms: D000332:Aerobiosis; D000393:Air Pollutants / Q000032:analysis*; D000693:Anaerobiosis; D002244:Carbon / Q000032:analysis*; D057486:Carbon Cycle; D002681:China; D004784:Environmental Monitoring; D057232:Global Warming; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology
chemical_list: D000393:Air Pollutants; D012987:Soil; D002244:Carbon
keywords: Carbon dioxide; Climate change; Methane; Peatland; Permafrost thaw; Temperature sensitivity