气候变化领域集成服务门户(CCPortal): Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

CCPortal

DOI	10.1029/2018GB005919
	Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams
	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.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1528
结束页码	1541
卷号	32 期号:10
英文摘要	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.
英文关键词	carbon cycling; DOM spectroscopy; metabolism; river ecosystems; spiraling metrics; uptake velocity
语种	英语
scopus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
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129785
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; Departm...
推荐引用方式 GB/T 7714	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],2018,32(10).
APA	Catalán N..,Casas-Ruiz J.P..,Arce M.I..,Abril M..,Bravo A.G..,...&Pastor A..(2018).Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams.Global Biogeochemical Cycles,32(10).
MLA	Catalán N.,et al."Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams".Global Biogeochemical Cycles 32.10(2018).