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Different responses of CO2 and CH4 to freeze-thaw cycles in an alpine forest ecosystem in northwestern China

文献类型：期刊论文

作者Yang, Shuping1,2; He, Zhibin2; Chen, Longfei2
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2023-03-10
卷号863页码:11
关键词Freeze-thaw cycle CH4 Temperature Moisture Alpine forest ecosystems CO2
ISSN号0048-9697
DOI10.1016/j.scitotenv.2022.160886
通讯作者He, Zhibin(hzbmail@lzb.ac.cn) ; Chen, Longfei(chenlongfei_mail@163.com)
英文摘要The frequency and intensity of freeze-thaw cycles (FTCs) at high latitudes and altitudes are expected to increase with climate change, with likely effects on soil carbon turnover and CO2 and CH4 fluxes. However, the effects of FTCs on CO2 and CH4 fluxes remain unexplored, especially in alpine forest ecosystems. Here, we conducted an incubation ex-periment using intact soil cores to explore the effects of FTCs on CO2 and CH4 fluxes. Since temperature and moisture are considered as potential factors affecting FTCs, two freezing temperatures and three moisture levels were included in the incubation conditions. Our results showed that FTCs significantly affected CO2 and CH4 fluxes, but their re-sponse patterns to FTCs were distinct. The FTCs promoted CO2 emission during the soil thawing phase, but reduced CH4 uptake during the freezing phase, resulting at times in the transition of the soil from a sink to a source of CH4. Both freezing temperature and soil moisture had significant impacts on CO2 (Ftemperature= 185.54, P < 0.001; Fmoisture = 117.47, P < 0.001) and CH4 fluxes (Ftemperature = 123.68, P < 0.001; Fmoisture = 14.55, P < 0.001), and their inter-action also had significant impacts on CO2 (FCO2 = 3.16, P < 0.05) and CH4 fluxes (FCH4 = 15.19, P < 0.001) during FTCs. The effect of microclimate composed by freezing temperature and soil moisture on CO2 and CH4 fluxes is a direct and dominant pathway (path coefficient >= 0.50). Substrate quality, and microbial properties also influenced CO2 fluxes during FTCs with the effect of the substrate being greater than that of microbial properties; substrate was impor-tant but the role of microorganisms was insignificant for CH4 fluxes. Our study revealed that the different responses of CO2 and CH4 to FTCs in soil cores from an alpine forest ecosystem could improve the understanding of soil carbon re-lease during FTCs and support accurate assessment of the carbon balance.
WOS关键词FRESH-WATER MARSH ; SOIL-GAS FLUXES ; METHANE EMISSION ; COMMUNITY COMPOSITION ; GREENHOUSE GASES ; TIBETAN PLATEAU ; ORGANIC-CARBON ; RIVER-BASIN ; RESPIRATION ; TEMPERATURE
资助项目National Natural Science Foundation of China ; Natural Science Foundation of Gansu Province ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) ; [42277481] ; [41701296] ; [22JR5RA058] ; [XDA23060301]
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000906255200001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Gansu Province ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)
源URL[http://ir.igsnrr.ac.cn/handle/311030/188753]  
专题中国科学院地理科学与资源研究所
通讯作者He, Zhibin; Chen, Longfei
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Linze Inland River Basin Res Stn, Chinese Ecosyst Res Network, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Shuping,He, Zhibin,Chen, Longfei. Different responses of CO2 and CH4 to freeze-thaw cycles in an alpine forest ecosystem in northwestern China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,863:11.
APA Yang, Shuping,He, Zhibin,&Chen, Longfei.(2023).Different responses of CO2 and CH4 to freeze-thaw cycles in an alpine forest ecosystem in northwestern China.SCIENCE OF THE TOTAL ENVIRONMENT,863,11.
MLA Yang, Shuping,et al."Different responses of CO2 and CH4 to freeze-thaw cycles in an alpine forest ecosystem in northwestern China".SCIENCE OF THE TOTAL ENVIRONMENT 863(2023):11.

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来源：地理科学与资源研究所

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