globalchange  > 气候变化与战略
DOI: 10.1029/2018GB005919
论文题名:
Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams
作者: Catalán N.; Casas-Ruiz J.P.; Arce M.I.; Abril M.; Bravo A.G.; del Campo R.; Estévez E.; Freixa A.; Giménez-Grau P.; González-Ferreras A.M.; Gómez-Gener L.; Lupon A.; Martínez A.; Palacin-Lizarbe C.; Poblador S.; Rasines-Ladero R.; Reyes M.; Rodríguez-Castillo T.; Rodríguez-Lozano P.; Sanpera-Calbet I.; Tornero I.; Pastor A.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期:10
语种: 英语
英文关键词: acetate ; carbon cycle ; dissolved organic carbon ; dissolved organic matter ; ecoregion ; freshwater ecosystem ; headwater ; metabolism ; respiration ; river ; semiarid region ; spectroscopy ; temperate environment ; velocity ; Europe
学科: carbon cycling ; DOM spectroscopy ; metabolism ; river ecosystems ; spiraling metrics ; uptake velocity
中文摘要: Large variability in dissolved organic carbon (DOC) uptake rates has been reported for headwater streams, but the causes of this variability are still not well understood. Here we assessed acetate uptake rates across 11 European streams comprising different ecoregions by using whole-reach pulse acetate additions. We evaluated the main climatic and biogeochemical drivers of acetate uptake during two seasonal periods. Our results show a minor influence of sampling periods but a strong effect of climate and dissolved organic matter (DOM) composition on acetate uptake. In particular, mean annual precipitation explained half of the variability of the acetate uptake velocities (VfAcetate) across streams. Temperate streams presented the lowest VfAcetate, together with humic-like DOM and the highest stream respiration rates. In contrast, higher VfAcetate were found in semiarid streams, with protein-like DOM, indicating a dominance of reactive, labile compounds. This, together with lower stream respiration rates and molar ratios of DOC to nitrate, suggests a strong C limitation in semiarid streams, likely due to reduced inputs from the catchment. Overall, this study highlights the interplay of climate and DOM composition and its relevance to understand the biogeochemical mechanisms controlling DOC uptake in streams. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160189
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作者单位: Catalan Institute for Water Research (ICRA), Girona, Spain; Limnology/Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden; Groupe de Recherche Interuniversitaire en Limnologie, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, QC, Canada; Center for Edafology and Apply Biology of Segura (CEBAS-CSIC), Murcia, Spain; BETA Technological Centre, Aquatic Ecology Group, University of Vic-Central University of Catalonia, Barcelona, Spain; Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish National Research Council (CSIC), Barcelona, Spain; Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence Campus Mare Nostrum, University of Murcia, Murcia, Spain; Environmental Hydraulics Institute, Universidad de Cantabria, Santander, Spain; CREAF-CSIC, Cerdanyola del Vallès, Spain; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Laboratory of Stream Ecology, Department of Plant Biology and Ecology, University of the Basque Country UPV/EHU, Bilbao, Spain; Departament de Biologia Evolutiva, Ecologia, i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; iMdea-Water Institute, Parque Científico Tecnológico de la Universidad de Alcalá, de Henares, Spain; Department of Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA, United States; GRECO, Institute of Aquatic Ecology, University of Girona, Girona, Spain; Department of Bioscience, Aarhus University, Århus, Denmark

Recommended Citation:
Catalán N.,Casas-Ruiz J.P.,Arce M.I.,et al. Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams[J]. Global Biogeochemical Cycles,2018-01-01,32(10)
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