DOI: 10.1007/s10533-014-0046-3
Scopus记录号: 2-s2.0-84922002720
论文题名: Modelling landscape controls on dissolved organic carbon sources and fluxes to streams
作者: Dick J.J. ; Tetzlaff D. ; Birkel C. ; Soulsby C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期: 2018-02-03 起始页码: 361
结束页码: 374
语种: 英语
英文关键词: Biogeochemical models
; Connectivity
; DOC
; Landscape units
; Runoff processes
; Upland catchments
英文摘要: Catchment dissolved organic carbon (DOC) fluxes are governed by complex interactions, which control biogeochemical processes generating DOC and hydrological connectivity, facilitating transport through the landscape to streams. This paper presents the development of a coupled hydrological-biogeochemical model for a northern watershed with organic-rich soils, to simulate daily DOC concentrations. The parsimonious model design allows the relative importance of DOC fluxes from the major landscape units (e.g. hillslopes, groundwater and riparian saturation area) to be determined. The dynamic extent of the saturated riparian zone, which at maximum wetness comprised 40 % of the drainage area, contributed 84 % of DOC to the stream, of which 16 % was derived from the hillslope soils. This shows the disproportional riparian influence on stream water chemistry and the importance of the non-linearity in hydrological connectivity. The temporal connectivity of each of the landscape units was dependent on antecedent moisture conditions, with highly transient connections between the hillslope and valley bottom saturated area, which were entirely disconnected during the driest periods. The groundwater contribution remained constant, but its relative importance increased during the driest periods. The study emphasises the importance of conceptualising hydrological connectivity and its relation to hydroclimatic factors, as well soil biogeochemical processes, when modelling stream water DOC. © 2014, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83552
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Northern Rivers Institute, School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom
Recommended Citation:
Dick J.J.,Tetzlaff D.,Birkel C.,et al. Modelling landscape controls on dissolved organic carbon sources and fluxes to streams[J]. Biogeochemistry,2015-01-01,122(2018-02-03)