Elevated CO2 does not favor a fungal decomposition pathway |
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Authors: | Kees-Jan Van Groenigen Johan Six Chris Van Kessel |
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Affiliation: | a Department of Plant Sciences, University of California-Davis, Davis, CA 95616, USA b Laboratory for Soil Science and Geology, Wageningen University, PO Box 37, 6700 AA Wageningen, The Netherlands c Stable Isotope Facility, University of California-Davis, Davis, CA 95616, USA |
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Abstract: | We examined the effect of prolonged elevated CO2 on the concentration of fungal- and bacterial-derived compounds by quantifying the soil contents of the amino sugars glucosamine, galactosamine and muramic acid. Soil samples were collected from three different terrestrial ecosystems (grassland, an aspen forest and a soybean/corn agroecosystem) that were exposed to elevated CO2 under FACE conditions for 3-10 years. Amino sugars were extracted from bulk soil and analyzed by gas chromatography. Elevated CO2 did not affect the size or composition of the amino sugar pool in any of the systems. However, high rates of fertilizer N applications decreased the amount of fungal-derived residues in the grassland system. We suggest that these results are caused by a decrease in saprophytic fungi following high N additions. Furthermore, our findings imply that the contribution of saprophytic fungi and bacteria to SOM in the studied ecosystems is largely unaffected by elevated CO2. |
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Keywords: | Elevated CO2 Face Bacteria Fungi Amino sugars |
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