Table 2 Water environmental properties in S. erectum habitats in July and September 2013 (A, n = 8; B, n = 3)

pH

6.15 (0.11)

6.54 (0.10)

***

−5.402

6.30 (0.23)

6.82 (0.15)

**

−3.625

EC (μs/cm)

192.9 (25.7)

101.6 (10.9)

***

5.806

269.3 (117.5)

86.0 (1.6)

*

2.611

Turbidity (NTU)

2.2 (1.5)

1.0 (0.3)

n.s

1.364

22.1 (53.3)

1.2 (0.2)

n.s

0.672

NO₃-N (mg/L)

6.2 (3.4)

1.8 (0.08)

n.s

2.155

4.2 (4.0)

1.4 (0.6)

n.s

1.918

NH₄-N (mg/L)

0.1 (0.1)

0.1 (0.0)

n.s

0.502

0.5 (0.9)

0.0 (0.0)

n.s

0.906

PO₄-P (mg/L)

0.0 (0.0)

0.0 (0.0)

n.s

0.358

0.0 (0.0)

0.0 (0.0)

n.s

1.528

K⁺ (mg/L)

16.6 (9.7)

8.2 (1.2)

n.s

1.439

26.3 (8.4)

8.1 (2.7)

**

3.587

Na⁺ (mg/L)

8.8 (4.2)

5.4 (0.9)

n.s

1.371

10.9 (1.9)

4.7 (1.6)

***

4.933

Ca²⁺ (mg/L)

19.5 (8.1)

13.4 (1.4)

n.s

1.245

35.8 (12.9)

15.5 (3.1)

*

2.628

Mg²⁺ (mg/L)

4.5 (2.2)

1.6 (0.5)

n.s

2.126

3.7 (1.8)

0.0 (0.0)

***

5.651