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The vegas’ soil from the highest altitude showed the highest soil organic carbon (SOC) content (A). Warming increased soil respiration rates and this effect was higher in soil from the highest altitude (B). Also, warming affected microbial biomass resulting in a decrease respect to lower temperature treatment (C); however, the biomass-specific soil respiration rates were higher in warming treatment (D). These results evidence that, in the short-term, warming stimulates resource allocation to respiration rather than microbial growth, which could be related to a reduction in the carbon use efficiency by microorganisms, with the consequence of soil C losses.
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M. Fernanda Chiappero , María V. Vaieretti , Norma Gallardo , Andrea E. Izquierdo
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