Rapid Increase in Soil Respiration and Reduction in Soil Nitrate Availability Following CO2 Enrichment in a Mature Oak Forest - Angeliki Kourmouli; R. Liz Hamilton; Johanna Pihlblad; Rebecca Bartlett; Angus Robert MacKenzie; Iain P. Hartley; Sami Ullah; Zongbo Shi (ACS Omega)