Buffer	P. linearifolia			P. huaijiensis
	Mean 2C-value (pg) ± SD	Mean RSE (%) sample	Mean RSE (%) standard	Mean 2C-value (pg) ± SD	Mean RSE (%) sample	Mean RSE (%) standard
MgSO4	1.516 ± 0.040a	0.084	0.098	1.818 ± 0.027a	0.070	0.080
Partec	1.589 ± 0.084a	0.161	0.164	1.883 ± 0.041a	0.094	0.099
de Laat's	1.548 ± 0.073a	0.147	0.196	1.822 ± 0.042a	0.088	0.105
Galbraith's	1.636 ± 0.131a	0.144	0.108	1.882 ± 0.123a	0.096	0.142
LB01	1.548 ± 0.006a	0.081	0.126	1.853 ± 0.016a	0.072	0.098
Tris-MgCl2	1.596 ± 0.072a	0.187	0.156	1.896 ± 0.048a	0.072	0.115
General purpose	1.557 ± 0.131a	0.122	0.109	1.889 ± 0.057a	0.062	0.113
Woody Plant	1.560 ± 0.055a	0.186	0.135	1.946 ± 0.018a	0.053	0.146
Mean	1.568 ± 0.074			1.874 ± 0.048

Letters shared (within each species) indicated no significant differences in mean 2C-value (Tukey's HSD test P = 0.05). SD, Standard deviation. Each value is the mean of four replicates.