冻土带
北极的
生物群落
环境科学
土壤水分
泰加语
甲烷厌氧氧化
生态系统
北方的
环境化学
永久冻土
甲烷
大气科学
土壤科学
生态学
化学
地质学
生物
作者
Jaehyun Lee,Jeongeun Yun,Yerang Yang,Jae Chang Jung,Yoo Kyung Lee,Junji Yuan,Weixin Ding,Chris Freeman,Hojeong Kang
标识
DOI:10.1021/acs.est.2c05228
摘要
CH4 emission in the Arctic has large uncertainty due to the lack of mechanistic understanding of the processes. CH4 oxidation in Arctic soil plays a critical role in the process, whereby removal of up to 90% of CH4 produced in soils by methanotrophs can occur before it reaches the atmosphere. Previous studies have reported on the importance of rising temperatures in CH4 oxidation, but because the Arctic is typically an N-limited system, fewer studies on the effects of inorganic nitrogen (N) have been reported. However, climate change and an increase of available N caused by anthropogenic activities have recently been reported, which may cause a drastic change in CH4 oxidation in Arctic soils. In this study, we demonstrate that excessive levels of available N in soil cause an increase in net CH4 emissions via the reduction of CH4 oxidation in surface soil in the Arctic tundra. In vitro experiments suggested that N in the form of NO3- is responsible for the decrease in CH4 oxidation via influencing soil bacterial and methanotrophic communities. The findings of our meta-analysis suggest that CH4 oxidation in the boreal biome is more susceptible to the addition of N than in other biomes. We provide evidence that CH4 emissions in Arctic tundra can be enhanced by an increase of available N, with profound implications for modeling CH4 dynamics in Arctic regions.
科研通智能强力驱动
Strongly Powered by AbleSci AI