Soil As Levels and Bioaccumulation in Suaeda salsa and Phragmites australis Wetlands of the Yellow River Estuary, China

Table 3

Seasonal changes in As concentrations (mean ± SE, mg/kg) in different plant tissues of Suaeda salsa and Phragmites australis.

	Suaeda salsa		Phragmites australis
	Summer	Autumn	Summer	Autumn
Root	2.62 ± 0.46^a	1.81 ± 0.26^b	0.79 ± 0.15^c	0.56 ± 0.12^c
Stem	1.81 ± 0.28^b	0.56 ± 0.14^c	1.20 ± 0.31^e	0.67 ± 0.16^c
Leaf	2.27 ± 0.29^a	3.16 ± 0.65^d	1.86 ± 0.22^b	2.82 ± 0.53^a

Different letters (abcde) indicate significant differences in As concentrations between Phragmites australis and Suaeda salsa.
SE means the standard error.