DOI: 10.1111/gcb.12333
论文题名: Effect of catchment characteristics on aquatic carbon export from a boreal catchment and its importance in regional carbon cycling
作者: Huotari J. ; Nykänen H. ; Forsius M. ; Arvola L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 12 起始页码: 3607
结束页码: 3620
语种: 英语
英文关键词: Boreal catchment
; CH4
; CO2
; Dissolved inorganic carbon
; Dissolved organic carbon
; Flux
Scopus关键词: carbon cycle
; carbon flux
; catchment
; dissolved inorganic carbon
; dissolved organic carbon
; dissolved organic matter
; land cover
; land use
; methane
; peatland
; Finland
; carbon
; carbon dioxide
; dissolved inorganic carbon
; dissolved organic carbon
; methane
; agriculture
; air pollutant
; article
; boreal catchment
; carbon cycle
; CH4
; chemistry
; ecosystem
; Finland
; flux
; river
; season
; soil
; boreal catchment
; CH4
; CO2
; dissolved inorganic carbon
; dissolved organic carbon
; flux
; Agriculture
; Air Pollutants
; Carbon
; Carbon Cycle
; Carbon Dioxide
; Ecosystem
; Finland
; Methane
; Rivers
; Seasons
; Soil
英文摘要: Inland waters transport and emit into the atmosphere large amounts of carbon (C), which originates from terrestrial ecosystems. The effect of land cover and land-use practises on C export from terrestrial ecosystems to inland waters is not fully understood, especially in heterogeneous landscapes under human influence. We sampled for dissolved C species in five tributaries with well-determined subcatchments (total size 174.5 km2), as well as in various points of two of the subcatchments draining to a boreal lake in southern Finland over a full year. Our aim was to find out how land cover and land-use affect C export from the catchments, as well as CH4 and CO2 concentrations of the streams, and if the origin of C in stream water can be determined from proxies for quality of dissolved organic matter (DOM). We further estimated the gas evasion from stream surfaces and the role of aquatic fluxes in regional C cycling. The export rate of C from the terrestrial system through an aquatic conduit was 19.3 g C m-2(catchment) yr-1, which corresponds to 19% of the estimated terrestrial net ecosystem exchange of the catchment. Most of the C load to the recipient lake consisted of dissolved organic carbon (DOC, 6.1 ± 1.0 g C m-2 yr-1); the share of dissolved inorganic carbon (DIC) was much smaller (1.0 ± 0.2 g C m-2 yr-1). CO2 and CH4 emissions from stream and ditch surfaces were 7.0 ± 2.4 g C m-2 yr-1 and 0.1 ± 0.04 g C m-2 yr-1, respectively, C emissions being thus equal with C load to the lake. The proportion of peatland in the catchment and the drainage density of peatland increased DOC in streams, whereas the proportion of agricultural land in the catchment decreased it. The opposite was true for DIC. Drained peatlands were an important CH4 source for streams. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62268
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Lammi Biological Station, University of Helsinki, Pääjärventie 320, Lammi, FI-16900, Finland; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, Jyväskylä, FI-40014, Finland; Finnish Environment Institute, P.O. Box 140, Helsinki, FI-00251, Finland
Recommended Citation:
Huotari J.,Nykänen H.,Forsius M.,et al. Effect of catchment characteristics on aquatic carbon export from a boreal catchment and its importance in regional carbon cycling[J]. Global Change Biology,2013-01-01,19(12)