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Alpine treelines in a CO2-rich and warm world

Description: Das Projekt "Alpine treelines in a CO2-rich and warm world" wird vom Umweltbundesamt gefördert und von Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft durchgeführt. We are experimentally increasing atmospheric CO2 concentrations (+200 ppm) and temperatures (+3K) at the alpine treeline and study the response of plant growth and soil processes. First results indicate that elevated CO2 rather affects the cycling rates than C pools in plants and soils. Rationale: The strong increase in atmospheric CO2 has changed ecosystems either directly through the CO2-effects on plant growth or indirectly through its impact on temperatures. It is likely that high altitude soils will respond particularly sensitive to the ongoing climatic changes. The temperature sensitivities of most biogeochemical processes are greater in the lower temperature range. Since alpine and montane soils contain great pools of labile C they play an important role in the response and feedbacks of the overall ecosystems C balance to the changing climate. Aims: to identify how and why does tree growth change to the increasing temperatures and CO2. to estimate how the climatic changes affects the concurrence between trees, dwarf shrubs, and grasses. to quantify the response of soil C fluxes (soil respiration, DOC leaching, accumulation in different SOM pools). to estimate the response of soil microbial community. to elucidate if the new plant-derived rapidly cycling soil C fraction or the older slower cycling soil C fraction responds more sensitive to climatic warming. to estimate if warming alters the partitioning of recent assimilates between plants and soils.

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Origin: /Bund/UBA/UFORDAT

Tags: Möwe ? Atmosphärische CO2-Konzentration ? Wasservogel ? Süßgräser ? Ohrenrobbe ? Großkatze ? Baum ? Strauch ? Simbabwe ? Bodenatmung ? Kohlendioxid ? Teich ? Temperatur ? Topographie ? Gelöster organischer Kohlenstoff ? Waldfläche ? Bilanz ? Bodenökosystem ? Schnee ? Studie ? Boden ? Hochgebirge ? Bodenprozess ? Wirkung ? Forschungseinrichtung ? Ökosystem ? Fahrradfahren ? Anreicherung ? Klima ? Klimawandel ? Baum, Pflanzenwachstum ? Welt ? biogeochemisch ? neu ? stark ? wichtig ? Überempfindlichkeit ? Bepflanzung ? Ergebnis ? Fraktion ? Gemeinschaft ? Atmungsaktivität, Bodenprozess ? Verantwortung ? Vermehrung ? Wachstum [biologisch] ?

License: cc-by-nc-nd/4.0

Language: Deutsch

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Time ranges: 2001-01-01 - 2011-12-31

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