Description: Das Projekt "Fluxes, pools, and turnover of C within the fine root systems of individual trees at a natural forest stand" wird vom Umweltbundesamt gefördert und von Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft durchgeführt. This project had the aim to investigate fluxes and pools of photosynthetically fixed carbon (C) within the fine root systems of individual Abies alba trees. Therefore, pulse-labellings with 13 CO2 were applied to aboveground parts of trees in order to follow the 13C-label within the root systems. The various forms of labelled C within the fine roots, non-structural (starch) as well as structural carbohydrates (cellulose), were recorded in dependency on time. Relative 13 C amounts (excess 13 C) in the fine roots increased significantly after the 3rd day of labelling as 13 C bulk and as 13 C cellulose. Highest values were recorded 1 and 6 months after labelling. Highest 13 C values were also recorded in the fine root diameter class 1.5-2.0 mm, whereas lowest values were in the fine roots diameter class less than 0.5 mm. A first 13 C-signal in the soil was recorded in the dissolved organic carbon (DOC) after 1 month. In the soil organic matter (SOM), however, a first 13 C-signal was observed only 12 months after the labelling. The label in the SOM occurred either in the floating SOM-particles after the water extraction or in the occluded and less dense fraction in the polytungstate. Applying the pulse-labelling either in spring, summer, or autumn, a clear seasonal effect was obvious by observing the incorporation of the 13 C-label into the root systems mainly in summer and autumn. However, after the spring pulse-labelling, a stronger signal was observed for clipped plants compared to the control plants. Measuring the 13 C-label in the starch of roots, it was obvious that the plants invested their photosynthetic products into root-starch mainly in the autumn. This highly labelled starch was mainly localised in the very young and newly formed fine roots.
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Origin: /Bund/UBA/UFORDAT
Tags: Weißtanne ? Tannen ? Produktkennzeichnung ? Baum ? Baumwurzel ? Zellulose ? Humus ? Kohlenhydrat ? Kohlenstoff ? Leguminosen ? Brunnen ? Stärke ? Pflanzenwurzel ? Sommer ? Teich ? Bestockung ? Unterboden ? Gelöster organischer Kohlenstoff ? Waldfläche ? Kohlenstoffkreislauf ? Naturwald ? Schnee ? Bodenwert ? Wirkung ? Forschungseinrichtung ? Partikel ? Wassergewinnung ? Herbst ? carbon fluxes and pools ? fine root distribution ? pulse labelling ? stable carbon isotope ? structural and non-structural carbohydra ? turnover ? Fluss [Bewegung] ? Inkorporation ? Silver fir individuals ? Vermehrung ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2005-11-01 - 2009-06-30
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