Buffer	P. linearifolia			P. huaijiensis			P. heterotricha
	Mean 2C-value (pg) ± SD	Mean RSE (%) sample	Mean RSE (%) standard	Mean 2C-value (pg) ± SD	Mean RSE (%) sample	Mean RSE (%) standard	Mean 2C-value (pg) ± SD	Mean RSE (%) sample	Mean RSE (%) standard
MgSO4	1.234 ± 0.008a	0.087	0.061	1.113 ± 0.008a	0.120	0.071	1.398 ± 0.036a	0.062	0.100
Partec	1.140 ± 0.018b	0.112	0.069	0.992 ± 0.013b	0.252	0.164	1.328 ± 0.038ab	0.126	0.140
de Laat's	1.188 ± 0.007c	0.109	0.089	1.224 ± 0.012c	0.155	0.126	1.236 ± 0.031c	0.122	0.126
Galbraith's	1.064 ± 0.022d	0.247	0.122	1.021 ± 0.011b	0.140	0.104	1.252 ± 0.047bc	0.102	0.124
LB01	1.190 ± 0.006ac	0.071	0.057	1.095 ± 0.005ad	0.094	0.066	1.414 ± 0.007a	0.072	0.107
Tris-MgCl2	1.132 ± 0.014b	0.184	0.080	1.086 ± 0.008ad	0.002	0.100	1.275 ± 0.059bc	0.092	0.150
General purpose	1.140 ± 0.008b	0.118	0.066	1.128 ± 0.044a	0.134	0.102	1.448 ± 0.015ad	0.086	0.159
Woody plant	1.192 ± 0.009c	0.096	0.004	1.068 ± 0.09d	0.234	0.155	1.340 ± 0.030ab	0.120	0.215
Mean	1.162 ± 0.014			1.086 ± 0.014			1.336 ± 0.032