DOI: 10.1007/s10533-015-0173-5
Scopus记录号: 2-s2.0-84958614420
论文题名: Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
作者: Casas-Ruiz J.P. ; Tittel J. ; von Schiller D. ; Catalán N. ; Obrador B. ; Gómez-Gener L. ; Zwirnmann E. ; Sabater S. ; Marcé R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 127, 期: 1 起始页码: 125
结束页码: 139
语种: 英语
英文关键词: Degradation
; Dissolved organic matter
; Drought
; Mediterranean rivers
; Radiocarbon
Scopus关键词: aquatic environment
; autochthon
; biodegradation
; carbon isotope
; dissolved organic matter
; drought
; heterogeneity
; leachate
; Mediterranean environment
; river basin
; river channel
; terrestrial ecosystem
; transformation
英文摘要: The composition of dissolved organic matter (DOM) in rivers results from the different sources and in-stream transformations along the land to ocean aquatic continuum. Riverine DOM sources are highly dependent on the hydrological connection between the river channel and the surrounding terrestrial ecosystems, but how the lack of this connectivity (e.g., during drought episodes) affects the sources and biodegradation of DOM in rivers remains unclear. Here we identified the DOM sources as well as the different DOM pools that are respired along a Mediterranean river during drought by combining absorbance-fluorescence spectroscopy, size-exclusion chromatography, biodegradation assays, and stable and radiocarbon isotopes. DOM composition was highly heterogeneous along the river in response to different sources and in-stream processes in each distinct aquatic environment (i.e., isolated water pools, running waters, and impounded waters in weirs). The reduced hydrological connectivity with terrestrial ecosystems promoted the influence of autochthonous DOM sources. Still, tree leaves from overhanging canopies stood out as an important terrestrial DOM source, especially in sites where water residence time was high such as isolated pools and weirs. Degradation of leaf leachates was a relevant process in these sites, whereas autochthonous DOM and groundwater millennial DOM (>1300 year B.P.) seemed to be degraded in running waters. Overall, our results highlight that the drought-induced hydrological disconnection entails a great spatial heterogeneity in the sources of DOM, which at the same time determines the different DOM pools that are respired in each environment along the river. © 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/83436
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: Catalan Institute for Water Research (ICRA), Emili Grahit 101, Girona, Spain; Department Lake Research, UFZ Helmholtz Centre for Environmental Research, Brückstr. 3a, Magdeburg, Germany; Department of Plant Biology and Ecology, University of the Basque Country, Apdo. 644, Bilbao, Spain; Department of Ecology and Genetics/Limnology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, Uppsala, Sweden; Department of Ecology, University of Barcelona, Av Diagonal 643, Barcelona, Spain; Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, Berlin, Germany; Institute of Aquatic Ecology, University of Girona, Girona, Spain
Recommended Citation:
Casas-Ruiz J.P.,Tittel J.,von Schiller D.,et al. Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river[J]. Biogeochemistry,2016-01-01,127(1)