Elevated CO2 does not favor a fungal decomposition pathway

K.J. van Groenigen, J. Six, D. Harris, C. van Kessel

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    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.
    Original languageEnglish
    Pages (from-to)2168-2172
    JournalSoil Biology and Biochemistry
    Issue number8
    Publication statusPublished - 2007


    • atmospheric co2
    • grassland soils
    • amino-sugars
    • nitrogen
    • carbon
    • responses
    • agroecosystems
    • limitation
    • bacterial

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    van Groenigen, K. J., Six, J., Harris, D., & van Kessel, C. (2007). Elevated CO2 does not favor a fungal decomposition pathway. Soil Biology and Biochemistry, 39(8), 2168-2172. https://doi.org/10.1016/j.soilbio.2007.03.009