Annual soil respiration (R) and its % decreased for each year in the pine forest (PF), the mixed conifer and broadleaf forest (MF) and the broadleaved forest (BF) under different SAR treatments (mean ± standard deviations).

n = 3 for all the treatments. Mean values within a row with different lowercase letter have significant treatment differences at p = 0.05 level. The treatments are: CK = control, T1 = pH 4.0, T2 = pH 3.5, T3 = pH 3.0. % decreased = 100 ((R of the CK treatment – R of each treatment)/R of the CK treatment) % (in the same time period); negative values within the column means % increased. The 1st year: April 2010 to March 2011; The 2nd year: April 2011 to March 2012; Mean: April 2010 to March 2012. Unit: kgCO2 m−2 yr−1 for R.