Functional relationship and significant test of model parameters.

Relationship of soil respiration rate (R, µmol CO2 m−2 s−1) with soil temperature at 5 cm below the soil surface (T,°C) and soil moisture of the top 5 cm soil layer (M, % vol.) is developed using R = (a+cM)exp(bT) (parameter estimate ± standard error). R2 in the table is the determination of coefficient, Q10 = exp(10b) is temperature sensitivity coefficient, and slope c is soil moisture sensitivity. The treatments are: AP = ambient precipitation, DP = double precipitation. Different letters in each forest within a column denote significant difference (p