Fig. 3

Seasonal variation in a differences in the mean air (dashed line) and soil temperature (solid line), and volumetric soil water content (dotted line) between the control and warmed plots at the Q. variabilis (black) and P. densiflora (gray) plots and mean soil CO₂ efflux in the control and warmed plots at the b Q. variabilis and c P. densiflora plots from June 2011 to April 2012. Vertical bars indicate the mean ± 1 SE (n = 4) and the asterisks denote significant differences at the P = 0.05 level. CQ (control Q. variabilis plot), WQ (warmed Q. variabilis plot), CP (control P. densiflora plot), WP (warmed P. densiflora plot)