Table 2. Dry weight (DW) (g) of root and aboveground tissues (combined wood, new shoots and leaves) and shoot length (cm) of three willow varieties grown in various Pb concentrations for 14 days.

	Varieties
Pb treatment (µM)	Yizhibi	Weishanhu	Dahongtou
DW of Aboveground tissue (g)
0	1.64±0.10ab	1.88±0.27a	1.90±0.07a
47	1.70±0.19a	1.66±0.13ab	1.50±0.15b
123	1.38±0.12bc	1.62±0.08abc	1.46±0.25bc
178	1.43±0.10cd	1.56±0.09bc	1.35±0.09bc
196	1.15±0.14d	1.36±0.09c	1.20±0.09c
DW of Root (g)
0	0.093±0.007a	0.12±0.01a	0.10±0.01a
47	0.083±0.013a	0.12±0.03a	0.08±0.00a
123	0.052±0.003b	0.08±0.01b	0.06±0.01b
178	0.057±0.003b	0.07±0.01b	0.06±0.00b
196	0.062±0.007b	0.08±0.02b	0.05±0.01b
Shoot length (cm)
0	40.03±1.15a	45.34±1.77a	39.94±4.73a
47	31.47±0.79b	32.37±3.22b	28.97±0.87b
123	31.31±3.30b	31.67±1.17b	28.72±1.68b
178	28.39±2.36bc	20.56±9.85bc	27.78±3.50b
196	25.81±3.64c	26.28±2.01c	17.17±3.33c

Values are mean ± S.D. (n = 6), and data with different letters in the same column indicate a significant difference at P<0.05 according to Fisher's LSD test.