Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14895 |
Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams | |
Rocher-Ros, Gerard; Sponseller, Ryan A.; Bergstrom, Ann-Kristin; Myrstener, Maria; Giesler, Reiner | |
2019-11-29 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Sweden |
英文摘要 | Streams play an important role in the global carbon (C) cycle, accounting for a large portion of CO2 evaded from inland waters despite their small areal coverage. However, the relative importance of different terrestrial and aquatic processes driving CO2 production and evasion from streams remains poorly understood. In this study, we measured O-2 and CO2 continuously in streams draining tundra-dominated catchments in northern Sweden, during the summers of 2015 and 2016. From this, we estimated daily metabolic rates and CO2 evasion simultaneously and thus provide insight into the role of stream metabolism as a driver of C dynamics in Arctic streams. Our results show that aquatic biological processes regulate CO2 concentrations and evasion at multiple timescales. Photosynthesis caused CO2 concentrations to decrease by as much as 900 ppm during the day, with the magnitude of this diel variation being strongest at the low-turbulence streams. Diel patterns in CO2 concentrations in turn influenced evasion, with up to 45% higher rates at night. Throughout the summer, CO2 evasion was sustained by aquatic ecosystem respiration, which was one order of magnitude higher than gross primary production. Furthermore, in most cases, the contribution of stream respiration exceeded CO2 evasion, suggesting that some stream reaches serve as net sources of CO2, thus creating longitudinal heterogeneity in C production and loss within this stream network. Overall, our results provide the first link between stream metabolism and CO2 evasion in the Arctic and demonstrate that stream metabolic processes are key drivers of the transformation and fate of terrestrial organic matter exported from these landscapes. |
英文关键词 | Arctic carbon cycle carbon processing CO2 evasion stream metabolism |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000499301300001 |
WOS关键词 | CARBON-DIOXIDE EMISSIONS ; ECOSYSTEM METABOLISM ; PERMAFROST CARBON ; PRODUCTIVITY ; REAERATION ; NETWORK ; SWEDEN ; SCALES ; PCO(2) |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/225298 |
专题 | 环境与发展全球科技态势 |
作者单位 | Umea Univ, Climate Impacts Res Ctr, Dept Ecol & Environm Sci, S-98107 Abisko, Sweden |
推荐引用方式 GB/T 7714 | Rocher-Ros, Gerard,Sponseller, Ryan A.,Bergstrom, Ann-Kristin,et al. Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams[J]. GLOBAL CHANGE BIOLOGY,2019. |
APA | Rocher-Ros, Gerard,Sponseller, Ryan A.,Bergstrom, Ann-Kristin,Myrstener, Maria,&Giesler, Reiner.(2019).Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams.GLOBAL CHANGE BIOLOGY. |
MLA | Rocher-Ros, Gerard,et al."Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams".GLOBAL CHANGE BIOLOGY (2019). |
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