The effect of dolomite amendment on soil organic carbon mineralization is determined by the dolomite size

Ecological Processes

Table 2 Estimated parameters for measuring the easily mineralizable C pool (C_e), potentially mineralizable carbon (C₀) and decomposition rate constant (k), and determination coefficients (R²) using the first-order model of the cumulative soil CO₂ emission

Treatments	C_e (g kg⁻¹)	C₀ (g kg⁻¹)	k (day⁻¹)	R²
S1
CK	0.013 ± 0.002b	0.372 ± 0.010c	0.035 ± 0.002b	0.995
CS	0.014 ± 0.002b	0.392 ± 0.011bc	0.033 ± 0.002b	0.996
MS	0.014 ± 0.002b	0.433 ± 0.015a	0.032 ± 0.002b	0.995
FS	0.029 ± 0.003a	0.405 ± 0.009b	0.049 ± 0.002a	0.992
S2
CK	0.014 ± 0.002b	0.222 ± 0.008c	0.041 ± 0.003b	0.986
CS	0.014 ± 0.002b	0.232 ± 0.006b	0.043 ± 0.002b	0.992
MS	0.015 ± 0.002b	0.258 ± 0.006a	0.045 ± 0.002b	0.992
FS	0.031 ± 0.003a	0.255 ± 0.005a	0.073 ± 0.004a	0.985

Values are presented as mean ± standard deviation of estimated parameters (n = 3)
CK presents soil without dolomite amendment; CS, MS, and FS present soil with the coarse-, medium-, and fine-sized dolomite amendment, respectively
Different letters in a column indicate significant differences between treatments in a single soil (LSD test, P < 0.05)