globalchange  > 气候减缓与适应
DOI: 10.1002/hyp.13329
WOS记录号: WOS:000456206300003
论文题名:
Controls on fluvial carbon efflux from eroding peatland catchments
作者: Brown, Sarah L.; Gouslbra, Claire S.; Evans, Martin G.
通讯作者: Brown, Sarah L.
刊名: HYDROLOGICAL PROCESSES
ISSN: 0885-6087
EISSN: 1099-1085
出版年: 2019
卷: 33, 期:3, 页码:361-371
语种: 英语
英文关键词: carbon dioxide (CO2) ; dissolved organic carbon (DOC) ; erosion ; fluvial ; particulate organic carbon (POC) ; peatland
WOS关键词: DISSOLVED ORGANIC-CARBON ; CLIMATE-CHANGE ; BLANKET PEAT ; WATER ; TEMPERATURE ; FLUXES ; OXYGEN ; RIVER ; DOC ; UK
WOS学科分类: Water Resources
WOS研究方向: Water Resources
英文摘要:

Global peatlands store an unparalleled proportion of total global organic carbon but it is vulnerable to erosion into fluvial systems. Fluvial networks are being recognized as areas of carbon transformation, with eroded particulate organic carbon processed to dissolved organic carbon and CO2. Existing studies indicate biodegradation and photodegradation as key processes controlling the transformation of organic carbon in fluvial systems, with initial concentrations of dissolved organic carbon (DOC) identified as a control on the rate of carbon mineralization. This study manipulates temperature and incident light intensity to investigate carbon mineralization rates in laboratory simulations of peatland sediment transport into fluvial systems. By directly measuring gaseous CO2 emissions from sampled stream water, the relationship of temperature and light intensity with carbon efflux is identified. In simulations where sediment (as particulate organic matter, POM) is absent, temperature is consistently the dominant factor influencing carbon efflux rates. This influence is independent of the initial DOC concentration of the water sample. In simulations where POM was added, representing a peatland river receiving eroded terrestrial sediment, initial DOC concentration predicts 79% of the variation in total gaseous carbon efflux whereas temperature and light intensity predict 12% and 3%, respectively. When sampled stream water's mineralization rates in the presence of added POM are analysed independently, removing DOC as a model variable, the dominant variable affecting CO2 efflux is opposite for each sample. This study presents novel data suggesting peatland erosion introduces further complexity to dynamic stream systems where rates of carbon transformation processes and the influence of specific environmental variables are interdependent. Anthropogenic climate change is identified as a leading risk factor perpetuating peatland erosion; therefore, understanding the fate of terrestrial sediment in rivers and further quantifying the benefits of protecting peatland soils will be of increasing importance to carbon budgeting and ecosystem function studies.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/128230
Appears in Collections:气候减缓与适应

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作者单位: Univ Manchester, Geog Dept, Manchester, Lancs, England

Recommended Citation:
Brown, Sarah L.,Gouslbra, Claire S.,Evans, Martin G.. Controls on fluvial carbon efflux from eroding peatland catchments[J]. HYDROLOGICAL PROCESSES,2019-01-01,33(3):361-371
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