DOI: 10.1007/s10533-015-0071-x
Scopus记录号: 2-s2.0-84939992876
论文题名: Spatial controls on dissolved organic carbon in upland waters inferred from a simple statistical model
作者: Monteith D.T. ; Henrys P.A. ; Evans C.D. ; Malcolm I. ; Shilland E.M. ; Pereira M.G.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期: 3 起始页码: 363
结束页码: 377
语种: 英语
英文关键词: Acidification
; Climate change
; Dissolved organic carbon
; Dissolved organic matter
; Land use
; Recovery
; Upland waters
英文摘要: Dissolved organic carbon (DOC) concentrations in upland surface waters in many northern hemisphere industrialised regions are at their highest in living memory, provoking debate over their “naturalness”. Because of the implications for drinking water treatment and supply there is increasing interest in the potential for mitigation through local land management, and for forecasting the likely impact of environmental change. However, the dominant controls on DOC production remain unresolved, hindering the establishment of appropriate reference levels for specific locations. Here we demonstrate that spatial variation in long-term average DOC levels draining upland UK catchments is highly predictable using a simple multiple logistic regression model comprising variables representing wetland soil cover, rainfall, altitude, catchment sensitivity to acidification and current acid deposition. A negative relationship was observed between DOC concentration and altitude that, for catchments dominated by organo-mineral soils, is plausibly explained by the combined effects of changing net primary production and temperature-dependent decomposition. However, the magnitude of the altitude effect was considerably greater for catchments with a high proportion of wetland cover, suggesting that additional controls influence these sites such as impeded respiratory loss of carbon in wet soils and/or an increased susceptibility to water level drawdown at lower altitudes. The model suggests (1) that continuing reductions in sulphur deposition on acid sensitive organo-mineral soils, will drive further significant increases in DOC and, (2) given the differences in the magnitude of the observed altitude-DOC relationships, that DOC production from catchments with peat-dominated soils may be more sensitive to climate change than those dominated by mineral soils. However, given that mechanisms remain unclear, the latter warrants further investigation. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83519
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: NERC Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, United Kingdom; NERC Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, United Kingdom; Marine Scotland Freshwater Laboratory, Faskally, Pitlochry, Perthshire, United Kingdom; Environmental Change Research Centre, University College London, Gower Street, London, United Kingdom
Recommended Citation:
Monteith D.T.,Henrys P.A.,Evans C.D.,et al. Spatial controls on dissolved organic carbon in upland waters inferred from a simple statistical model[J]. Biogeochemistry,2015-01-01,123(3)