Table 4 Results (F-values) of repeated-measures analysis of variance of the effects of fire disturbance (F), measurement date (D), and their interaction on soil total respiration (Rs) (μmol CO2 m−2 s−1), soil heterotrophic respiration (Rh) (μmol CO2 m−2 s−1), and soil autotrophic respiration (Ra) (μmol CO2 m−2 s−1)