7 Controls of dissolved organic matter fluxes in ecosystems


Joanna Clark (UK),
Klaus Holger Knorr (DE)

Montag, 10:45-16:35, H19

Dissolved organic matter (DOM) is a critical flux from terrestrial to freshwater ecosystems, influencing many biogeochemical processes by providing a substrate for microbial metabolism, altering acidity, transporting metals and contaminants, and regulating light penetration. Great attention has been given to understanding the controls on DOM fluxes in the last 10 years, following observations of increased DOC concentrations in freshwaters across many parts of Europe and North America since the late 1980s. Reconciling the effect of different processes affecting the production, mobility and transport of DOM has led to a range of apparently conflicting views over the key drivers of DOM mobilization and fluxes across different temporal and spatial scales. These challenges are further complicated by poor understanding of DOM properties, which are controlled by the source and influence its subsequent function and stability. This session aims to advance current understanding about environmental drivers of DOM fluxes across ecosystems and catchments over short to longer-term temporal scales. Particular emphasis will be placed on how environmental conditions affect DOM sources, quality and fate, thus also small-scale experimental studies are invited. Contributions looking at the interactions between carbon, nitrogen and other elemental cycles are welcome.


Session key note speaker:

Chris Evans (UK)  Brown water in the Conwy, Kalimantan and Kyoto: DOC in the carbon balance of managed peatlands

10:45Invited Talk 7: Chris Evans: Brown water in the Conwy, Kalimantan and Kyoto: DOC in the carbon balance of managed peatlands
11:15O 7.1: Heleen de Wit et al.: Changing aquatic DOC export – implications for the terrestrial carbon sink
11:35O 7.2: Reiner Giesler et al.: Stream dissolved organic carbon in a changing tundra landscape
11:55O 7.3: Frank Hagedorn et al.: Experimental soil warming alters the sources of DOM in alpine treeline soils
12:15O 7.4: José Ledesma et al.: Potential for long-term transfer of DOC from riparian zones to streams in boreal catchments
12:35Lunch (Mensa)
14:00Key Note 2: Susan Trumbore (H15, NWI)Getting to the roots of soil carbon cycling
14:45Coffee Break
15:15O 7.5: Carsten Meyer-Jacob et al.: Historical landscape utilization and centennial scale changes in lake-water carbon: brownification beyond the perspective of monitoring
15:35O 7.6: Don Monteith et al.: Can the spatial distribution of dissolved organic carbon concentration in upland waters inform our understanding of processes and long term trends.
15:55O 7.7: Darren Baldwin et al.: Dissolved organic carbon dynamics in a large lowland river
16:15O 7.8: Adam Wymore et al.: Following the community and ecosystem consequences of labile DOM transformations in aquatic ecosystems

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P 7.1 Kestutis Armolaitis, Vidas Stakenas, Ausra Gudauskiene, Jurate Aleinikoviene
Leaching of Soil Organic Carbon and Plant Nutrients in Fresh Clear Cuttings of Coniferous Stands
P 7.2 Andreas Bantle, Werner Borken, Egbert Matzner
Quantity and quality of dissolved organic carbon released from coarse woody debris of different tree species in the early phase of decomposition
P 7.3 Sebastian Bischoff, Martin Schwarz, Jan Siemens, Lisa Thieme, Wolfgang Wilcke, Beate Michalzik
Particulate(s) matter! - Importance of canopy-derived water-bound particulate matter in forest ecosystem nutrient cycling
P 7.4 Sarka Cepakova, Jan Frouz
Sources of dissolved organic carbon in surface horizons and its relevance to stability of organic matter in soil
P 7.5 Sabine Dvorski, Jenny Westphal, Claudia Kellermann, Hubert Müller, Michael Größbacher, Mourad Harir, Norbert Hertkorn, Christian Griebler, Philippe Schmitt-Kopplin
Ultrahigh-resolution mass spectrometry of dissolved organic matter from a tar oil contaminated aquifer along biogeochemical gradients
P 7.6 Eugen Federherr, Torsten C. Schmidt, Chiara Cerli, Karsten Kalbitz, Hans J. Kupka, Lutz Lange, Ralf Dunsbach, Robert Panetta
Novel tool for simultaneous carbon and nitrogen stable isotope analyses in aqueous samples
P 7.7 Kazumichi Fujii, Chie Hayakawa, Mari Uemura, Yuji Nakata, Makoto Yoshida, Shinya Funakawa
Mechanisms and regulating factors of dissolved organic matter production in forest soils of Japan and Indonesia
P 7.8 Jon García-García, Estilita Ruiz-Romera, Miren Martínez-Santos, Borja Muñoz-Leoz, Eider Unamuno
Comparison of variability of particulate (SS, POC) and dissolved (DOC) matter during flood events in two catchments (Basque Country, Northern Spain)
P 7.9 Annemieke Gärdenäs, Martin Rappe-George, Dan Kleja
The impact of four decades of annual nitrogen addition on dissolved organic matter in a boreal forest soil
P 7.10 Diana Hofmann, Bernhard Steffen, Ulrich Disko, Gerhart Wagner, Christian Mätzler
Hair ice
P 7.11 Jakub Hruška, Pavel Krám, Filip Moldan, Filip Oulehle, Christopher D. Evans, Richard F. Wright, Jiří Kopáček, Bernard J. Cosby
Changes in soil dissolved organic carbon affect reconstructed history and projected future trends in surface water acidification
P 7.12 Frederique Kirkels, Chiara Cerli, Eugen Federherr, Karsten Kalbitz
A novel method for dissolved organic carbon (DOC) isotopic (δ13C) and concentration analysis in environmental samples
P 7.13 Maris Klavins
Flows of DOC from Territory of Latvia and Factors Controlling it
P 7.14 Mi-Hee Lee, Jean-Lionel Payeur-Poirier, Silvia Parra, Ji-Hyung Park, Bomchul Kim, Gerhard Gebauer, Stefan Peiffer, Egbert Matzner
The export of dissolved and particulate organic carbon and nitrogen in two forested catchments during heavy precipitation events in South Korea
P 7.15 Carlos Oyarzun, Pedro Herve-Fernandez
N and P balance from catchments with different land cover, and exportation of nutrients during storm events, in south central Chile
P 7.16 Jonathan Ritson, Graham Nigel, Templeton Michael, Freeman Chris, Clark Joanna
Assessing the impact of catchment management and climatic change on dissolved organic carbon flux in relation to drinking water treatment.
P 7.17 Kasia Sawicka, Joanna Clark, Elena Vanguelova, Don Monteith, Andrew Wade
Examining mutli-scale patterns in soil water DOC in the UK
P 7.18 Liisa Ukonmaanaho, Martin Forsius, Lauri Arvola, Markus Hartman, Mike Starr
Riparian zone and stream water DOC concentration and quality in relation to land use
P 7.19 Anatoly Prokushkin, Irina Tokareva, Mikhail Korets, Sergey Titov, Marina Prokushkina, Alexey Rubtsov, Oleg Pokrovsky
Riverine carbon flux within the Central Siberian Plateau: terrestrial and climatic controls

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