Fig. 7. Time series analysis of temperature and CO₂ flux. (A) Cross correlation between air temperature and CO₂ flux; (B) cross correlation between surface soil temperature and CO₂ flux; (C) cross correlation between 5-cm soil temperature and CO₂ flux. Symbols: Chamber 1 (open circles), Chamber 2 (open triangles), Chamber 3 (closed circles), Chamber 4 (closed triangles).