DOI: 10.1111/gcb.12491
论文题名: Almost 50 years of monitoring shows that climate, not forestry, controls long-term organic carbon fluxes in a large boreal watershed
作者: Lepistö A. ; Futter M.N. ; Kortelainen P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 4 起始页码: 1225
结束页码: 1237
语种: 英语
英文关键词: Drought
; Forestry
; Frost
; INCA-C
; Modeling
; Organic carbon
; TOC flux
; Watershed
Scopus关键词: annual variation
; climate change
; climate effect
; concentration (composition)
; ecosystem response
; environmental monitoring
; forest management
; land management
; monitoring system
; organic carbon
; runoff
; soil moisture
; total organic carbon
; watershed
; Finland
; Lappi [Finland]
; Simojoki Basin
; carbon
; calibration
; carbon cycle
; climate
; drought
; environmental monitoring
; Finland
; flooding
; forestry
; season
; temperature
; theoretical model
; Calibration
; Carbon
; Carbon Cycle
; Climate
; Droughts
; Environmental Monitoring
; Finland
; Floods
; Forestry
; Models, Theoretical
; Seasons
; Temperature
英文摘要: Here, we use a unique long-term data set on total organic carbon (TOC) fluxes, its climatic drivers and effects of land management from a large boreal watershed in northern Finland. TOC and runoff have been monitored at several sites in the Simojoki watershed (3160 km2) since the early 1960s. Annual TOC fluxes have increased significantly together with increased inter-annual variability. Acid deposition in the area has been low and has not significantly influenced losses of TOC. Forest management, including ditching and clear felling, had a minor influence on TOC fluxes - seasonal and long-term patterns in TOC were controlled primarily by changes in soil frost, seasonal precipitation, drought, and runoff. Deeper soil frost led to lower spring TOC concentrations in the river. Summer TOC concentrations were positively correlated with precipitation and soil moisture not temperature. There is some indication that drought conditions led to elevated TOC concentrations and fluxes in subsequent years (1998-2000). A sensitivity analysis of the INCA-C model results showed the importance of landscape position, land-use type, and soil temperature as controls of modeled TOC concentrations. Model predictions were not sensitive to forest management. Our results are contradictory to some earlier plot-scale and small catchment studies that have shown more profound forest management impacts on TOC fluxes. This shows the importance of scale when assessing the mechanisms controlling TOC fluxes and concentrations. The results highlight the value of long-term multiple data sets to better understand ecosystem response to land management, climate change and extremes in northern ecosystems. © 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/61937
Appears in Collections: 影响、适应和脆弱性
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作者单位: Finnish Environment Institute SYKE, P.O. Box 140, FI-00251 Helsinki, Finland; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences SLU, P.O. Box 7050, SE-75007 Uppsala, Sweden
Recommended Citation:
Lepistö A.,Futter M.N.,Kortelainen P.. Almost 50 years of monitoring shows that climate, not forestry, controls long-term organic carbon fluxes in a large boreal watershed[J]. Global Change Biology,2014-01-01,20(4)