Elevated CO <sub>2</sub> affects the content of glomalin related soil protein in xeric temperate loess and temperate semi-desert sand grasslands
2008
Vodnik, D. | Maček, I. | Péli, E. | Videmšek, U. | Tuba, Z.
Monoliths of temperate loess grassland and temperate semi-desert sand grassland have been exposed to elevated CO <sub>2</sub> (700 μmol mol <sup>−1</sup>) and present ambient CO <sub>2</sub> concentration in a 6-year open top chamber (OTC) experiment. In loess grassland elevated CO <sub>2</sub> increased both biomass and vegetation cover, whereas there was no similar effect found in semi-desert grassland. The content of glomalin related soil protein (GRSP) increased in both loess and sand grasslands under CO <sub>2</sub> enrichment (early summer aspect). The increase was higher in the case of easily extractable fraction (EEG), representing 14.7 and 22.2% of the chambered control’s EEG, for loess and sand grassland respectively. In the case of total glomalin the increase was much lower 7.9% (loess) and 2.6% (sand). On the basis of differences between elevated and ambient CO <sub>2</sub> treatment we could conclude that elevated CO <sub>2</sub> promoted C-deposition in xeric temperate grassland in early summer. Increases of EEG indicate an efficient partitioning of the recently fixed carbon to the soil.
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