Description: Das Projekt "Does traditional Alpine farming alter greenhouse gas emissions and C-turnover in remote mountain streams? (Marie Heim-Voegtlin Beiträge)" wird vom Umweltbundesamt gefördert und von Ecole Polytechnique Federale de Lausanne (EPFL), Faculte de l'Evironnement Naturel, Architectural et Construit (ENAC), IIE, Stream Biofilm and Ecosystem Research Laboratory (SBER) durchgeführt. Because inland waters only cover a small portion (6-15%) of the terrestrial surface they are often not regarded as an important component of the global carbon (C) cycle. However, as part of the terrestrial landscape these active, rather than passive, conduits receive and transform substantial amounts of organic C. In fact, the global carbon dioxide (CO2) emissions from inland waters was estimated to be about 1.4 Gt C year-1 corresponding to about 50 % of the terrestrial C sink. Together with methane (CH4) this results in C emissions from inland waters that correspond to about 75 % of the terrestrial sink. However, there is a large degree of uncertainty in these estimates as most studies on rivers and streams have focused on CO2 emissions, with little research performed on CH4 emissions and turnover processes. Furthermore, studies on C-fluxes and turnover processes in small streams are highly under-represented. Thus, the overall objective of this proposal is to study the dynamics of C fluxes (CO2 and CH4), and the pathways of CH4 production in Alpine streams influenced by managed Alpine pastures, thereby adding another puzzle piece to the understanding of C-cycling in small streams It is still common in Switzerland to drive livestock up into the Alps for summer farming and grazing. However, the associated fecal and urine deposits may strongly influence the species composition of the vegetation in mountain meadows, the quality of soil organic matter and thus dissolved organic matter quality entering adjacent streams. Once the organic matter enters the stream in particulate and/or dissolved form, it will be degraded by microbes either aerobically or anaerobically (or both) while producing CO2 and CH4. CH4 can be produced via acetate fermentation or CO2 reduction. Which of these two pathway used for CH4 production depends on the quality and age of the organic matter. The effect of Alpine summer farming on C emissions (CO2 and CH4) and C turnover processes will be investigated in headwaters draining intensely farmed Alpine/subalpine pastures. A field study will be performed based on 1) a stable isotope approach, 2) resolving CH4 and CO2 fluxes, 3) investigating the CH4 production pathways and 4) changes in microbial communities.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Wildbach ? Tierhaltungsanlage ? Gebirgsbach ? Nährstoffgehalt ? CO2-Emission ? Kohlenstoffverbindung ? Methanemission ? Vegetation ? Fluss ? Milchvieh ? Kohlenstoffgehalt ? Flussverunreinigung ? Urin ? Humus ? Fäkalien ? Rind ? Schadstoffwirkung ? Wiese ? Schweiz ? Treibhausgasemission ? Aerober Abbau ? Fermentation ? Anaerober Abbau ? Isotopentechnik ? Kohlendioxid ? Methan ? Pflanzenart ? Schadstoffimmission ? Sommer ? Organisches Material ? Tierproduktion ? Binnengewässer ? Biofilm ? Gelöste Stoffe ? CO2-Minderung ? Partikelminderung ? Schadstoffabbau ? Studie ? Artenzusammensetzung ? Viehwirtschaft ? Wasserqualität ? Wasserinhaltsstoff ? Beweidung ? Kohlenstoffkreislauf ? Hochgebirge ? Kleingewässer ? Ökosystemforschung ? Nährstoffeintrag ? Bodenqualität ? Nährstoffkreislauf ? Aquatisches Ökosystem ? Alpen ? Stoffwechsel ? Anthropogener Einfluss ? Schadstoffbildung ? C cycling ? microbial community ? organic matter quality ? NOM [natürlicher organischer Stoff] ? Physikalische Einwirkung ? Sömmerung ? Wassermikroorganismen ? alpine farming ? land-water connection ? Almweide ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2016-03-01 - 2018-02-28
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