DOI: 10.5194/hess-19-2377-2015
Scopus记录号: 2-s2.0-84930226738
论文题名: Interacting effects of climate and agriculture on fluvial DOM in temperate and subtropical catchments
作者: Graeber D ; , Goyenola G ; , Meerhoff M ; , Zwirnmann E ; , Ovesen N ; B ; , Glendell M ; , Gelbrecht J ; , Teixeira De Mello F ; , González-Bergonzoni I ; , Jeppesen E ; , Kronvang B
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 5 起始页码: 2377
结束页码: 2394
语种: 英语
Scopus关键词: Agriculture
; Aquatic ecosystems
; Biogeochemistry
; Biological materials
; Carbon
; Ecology
; Fluorescence
; Organic carbon
; Runoff
; Size exclusion chromatography
; Biogeochemical cycle
; Dissolved organic carbon
; Dissolved organic matters
; Fluorescence components
; Fluorescence measurements
; Monitoring techniques
; Parallel factor analysis
; Subtropical climates
; Catchments
; aquatic ecosystem
; catchment
; climate effect
; discharge
; dissolved organic matter
; factor analysis
; intensive agriculture
; subtropical region
; temperate environment
; Denmark
; Uruguay
英文摘要: Dissolved organic matter (DOM) is an important factor in aquatic ecosystems, which is involved in a large variety of biogeochemical and ecological processes, and recent literature suggests that it could be strongly affected by agriculture in different climates. Based on novel monitoring techniques, we investigated the interaction of climate and agriculture effects on DOM quantity and quality. To examine this, we took water samples over 2 years in two paired intensive and extensive farming catchments in each of Denmark (temperate climate) and Uruguay (subtropical climate). We measured dissolved organic carbon (DOC) and nitrogen (DON) concentrations and DOC and DON molecular fractions with size-exclusion chromatography. Moreover, we characterized DOM quality with absorbance and fluorescence measurements, as well as parallel factor analysis (PARAFAC). We also calculated the DOC and DON loads based on daily discharge measurements, as well as measured precipitation and air temperature. The fluvial DOM in the catchments in Uruguay was characterized by higher temporal variability of DOC and DON loads which were clearly to a higher temporal variability of precipitation and a DOM composition with rather plant-like character relative to the Danish catchments. Moreover, we found a consistently higher temporal variability of DOC and DON loads in the intensive farming catchments than in the extensive farming catchments, with highest temporal variability in the Uruguayan intensive farming catchment. Furthermore, the composition of DOM exported from the intensive farming catchments was consistently complex and always related to microbial processing in both Denmark and Uruguay. This was indicated by low C : N ratios, several spectroscopic DOM composition indices and PARAFAC fluorescence components. We propose that the consistent effect of intensive farming on DOM composition and the temporal variability of DOC and DON loads is related to similarities in the management of agriculture, which may have widescale implications for fluvial DOM composition, as well as related ecological processes and biogeochemical cycles. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78519
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Bioscience, Aarhus University, Aarhus, Denmark; Centro Universitario Regional Este, Facultad de Ciencias, Universidad de la Rep͡blica, Maldonado, Uruguay; Chemical Analytics and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; Sino-Danish Centre for Education and Research, Beijing, China
Recommended Citation:
Graeber D,, Goyenola G,, Meerhoff M,et al. Interacting effects of climate and agriculture on fluvial DOM in temperate and subtropical catchments[J]. Hydrology and Earth System Sciences,2015-01-01,19(5)