globalchange  > 气候变化事实与影响
DOI: 10.1002/2013GB004760
Scopus记录号: 2-s2.0-84910120850
论文题名:
Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland
作者: Wang Y; , Liu H; , Chung H; , Yu L; , Mi Z; , Geng Y; , Jing X; , Wang S; , Zeng H; , Cao G; , Zhao X; , He J; -S
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期:10
起始页码: 1081
结束页码: 1095
语种: 英语
英文关键词: alpine ecosystem ; carbon cycling ; soil freezing ; Tibetan Plateau ; winter soil respiration
Scopus关键词: alpine environment ; carbon cycle ; freeze-thaw cycle ; frozen ground ; grassland soil ; growing season ; monsoon ; soil respiration ; summer ; China ; Qinghai-Xizang Plateau
英文摘要: The Tibetan alpine grasslands, sharing many features with arctic tundra ecosystems, have a unique non-growing-season climate that is usually dry and without persistent snow cover. Pronounced winter warming recently observed in this ecosystem may significantly alter the non-growing-season carbon cycle processes such as soil respiration (Rs), but detailed measurements to assess the patterns, drivers of, and potential feedbacks on Rs have not been made yet. We conducted a 4 year study on Rs using a unique Rs measuring system, composed of an automated soil CO2 flux sampling system and a custom-made container, to facilitate measurements in this extreme environment. We found that in the nongrowing season, (1) cumulative Rs was 82-89 g C m-2, accounting for 11.8-13.2% of the annual total Rs; (2) surface soil freezing controlled the diurnal pattern of Rs and bulk soil freezing induced lower reference respiration rate (R0) and temperature sensitivity (Q10) than those in the growing season (0.40-0.53 versus 0.84-1.32 μmol CO2 m-2 s-1 for R0 and 2.5-2.9 versus 2.9-5.6 for Q10); and (3) the intraannual variation in cumulative Rs was controlled by accumulated surface soil temperature. We found that in the summer monsoon-dominated Tibetan alpine grassland, surface soil freezing, bulk soil freezing, and accumulated surface soil temperature are the day-, season-, and year-scale drivers of the non-growing-season Rs, respectively. Our results suggest that warmer winters can trigger carbon loss from this ecosystem because of higher Q10 of thawed than frozen soils. Key Points Four year continuous hourly monitoring of soil CO2 flux (Rs) using automated systemNon-growing-season cumulative Rs accounted for 11.8-13.2% of the annual total RsHigher Q10 of thawed than frozen soil can trigger C loss in warmer winter © 2014. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77521
Appears in Collections:气候变化事实与影响

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作者单位: Department of Ecology, Ministry of Education, Peking University, Beijing, China; Department of Environmental Engineering, Konkuk University, Seoul, South Korea; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Key Laboratory for Urban Habitat Environmental Science and Technology, Peking University Shenzhen Graduate School, Shenzhen, China

Recommended Citation:
Wang Y,, Liu H,, Chung H,et al. Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland[J]. Global Biogeochemical Cycles,2014-01-01,28(10)
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