Rapid Increase in Soil Respiration and Reduction in Soil Nitrate Availability Following CO₂ Enrichment in a Mature Oak Forest.

R s , VWC, and T s were all higher in eCO 2 than in aCO 2 ( Figure 1 ) which resulted in a highly significant interaction effect of VWC and T s ( p = 1.73 × 10 –5 ) that explained 31% of the variability in observed R s ( Table 1 ).

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Marginal significance was also apparent for all three nutrients in eCO 2 , however, they were not statistically significant, and the explained variability was low.

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