DOI: 10.1007/s10533-015-0077-4
Scopus记录号: 2-s2.0-84940001290
论文题名: Hydrological transitions drive dissolved organic matter quantity and composition in a temporary Mediterranean stream
作者: von Schiller D. ; Graeber D. ; Ribot M. ; Timoner X. ; Acuña V. ; Martí E. ; Sabater S. ; Tockner K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期: 3 起始页码: 429
结束页码: 446
语种: 英语
英文关键词: Dissolved organic carbon
; Dissolved organic matter
; Drought
; Drying
; Rewetting
; Temporary stream
英文摘要: The implications of stream flow intermittency for dissolved organic matter (DOM) are not well understood despite its potential significance for water quality and ecosystem integrity. We combined intensive sampling with liquid chromatography and spectroscopic techniques to follow changes in DOC and DON concentrations as well as in DOM size fractions and spectroscopic properties in a temporary stream during an entire contraction–fragmentation–expansion hydrological cycle. DOC and DON concentrations remained low (range = 1.4–5.2 mg C L−1 and 0.05–0.15 mg N L−1) during hydrological contraction and fragmentation, with concomitant increases in the proportion of high molecular weight substances (HMWS) during contraction and of DOM aromaticity during fragmentation. DOC and DON concentrations abruptly increased (up to 8.8 mg C L−1 and 0.37 mg N L−1) at the end of the fragmentation phase, with a concomitant increase in the non-humic, microbial and aquatic character of DOM. Upon rewetting, the DOC and DON concentrations reached their highest values (up to 12.7 mg C L−1 and 0.39 mg N L−1), with concomitant increases in the proportion of HMWS and in the humic, aromatic and terrestrial character of DOM. Subsequently, DOC and DON concentrations recovered to values similar to those at the contraction phase, while DOM composition variables indicated the prevalence of a DOM of humic and terrestrial character during the whole expansion phase. Overall, our results emphasize the importance of hydrological transitions for DOM dynamics in temporary streams, and point to the potential response of perennial streams under future water scarcity scenarios. © 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/83522
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, Emili Grahit 101, Girona, Spain; Department of Bioscience, Aarhus University, Vejlsøvej 25, Silkeborg, Denmark; Integrative Freshwater Ecology Group, Centre for Advanced Studies of Blanes (CEAB-CSIC), Accés a la Cala St. Francesc 14, Blanes, Spain; Institute of Aquatic Ecology, University of Girona, Girona, Spain; Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, Berlin, Germany; Institute of Biology, Freie Universität Berlin, Takustraße 3, Berlin, Germany
Recommended Citation:
von Schiller D.,Graeber D.,Ribot M.,et al. Hydrological transitions drive dissolved organic matter quantity and composition in a temporary Mediterranean stream[J]. Biogeochemistry,2015-01-01,123(3)