摘要
全球变暖可能导致多年冻土中的有机碳分解,向大气释放甲烷(CH_(4)),但多年冻土的甲烷释放通量与微生物群落结构以及功能基因的丰度相关性还不清楚.于2019年6月~2020年1月,选择青藏高原北部祁连山多年冻土区,利用静态箱-气相色谱法对不同海拔地区进行CH_(4)释放通量测定,并分析土壤理化性质、CH_(4)功能微生物群落、功能微生物的基因丰度.结果发现,整体上,甲烷通量随着海拔的上升而增加,在4100 m和3900 m处表现为源,而其他各海拔地区表现为碳汇.土壤含水率、电导率和mcr A基因丰度与CH_(4)通量正相关.研究表明祁连山多年冻土区不同海拔CH_(4)通量受土壤含水率和mcr A基因丰度的影响,而有机碳含量会影响微生物的多样性.
Global warming may cause the decomposition of organic carbon in permafrost regions and release methane(CH_(4))into the atmosphere,while the correlation between methane fluxes in permafrost regions and the structure of methane-related microbes and the abundance of functional genes remains unclear.In this study,we selected the permafrost region of the Qilian Mountains in the northern Qinghai-Tibet Plateau,and the field work was conducted from June 2019 to January 2020.The CH_(4) fluxes were measured at different altitudes using static chamber-gas chromatography.The soil physical and chemical variables and abundances of CH_(4) function genes were analyzed.The results show that the methane fluxes largely increased with the altitude.It appeared as a source at 4100 m and 3900 m,while other altitude areas appear as carbon sinks.The soil moisture content,conductivity and mcr A gene abundance were positively correlated with CH_(4) fluxes.The results showed that CH_(4) flux at different altitudes in the permafrost regions of Qilian Mountains were affected by soil moisture content and mcr A gene abundance,while organic carbon content mainly affected microbial diversity.
作者
毛楠
刘桂民
李莉莎
李小明
张博
徐海燕
吴晓东
Mao Nan;Liu Guimin;Li Lisha;LiXiaoming;Zhang Bo;Xu Haiyan;Wu Xiaodong(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Cryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cry ospheric Science,Northwest Institute of the Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2022年第2期556-567,共12页
Earth Science
基金
国家自然科学基金项目(Nos.41661013,41871060,41861011)
中国科学院西部之光项目。
关键词
多年冻土
甲烷通量
功能基因
微生物
环境地质
permafrost
methane flux
functional gene
microbes
environmental geology
