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Table 3 Enzymatic activity of soils at differently urbanized area

From: Mutual relations between PAHs derived from atmospheric deposition, enzymatic activity, and humic substances in soils of differently urbanized areas

 

Year

DhA

PhacA

PhalA

UA

PA

Urban area

2014

2.48a

1.78a

1.29a

19.92b

4.32a

2015

1.96a

1.49a

1.10a

15.35b

3.86a

2016

1.54a

1.16a

1.02a

18.69b

3.12a

Average

1.99a

1.47a

1.13a

17.98b

3.76a

Suburban area

2014

5.32b

3.82b

2.95b

17.04b

8.97b

2015

4.87b

3.44b

2.68b

15.29b

8.32b

2016

4.36b

3.29b

2.46b

16.11b

7.16b

Average

4.85b

3.51b

2.69b

16.14b

8.15b

Rural area

2014

8.59c

6.58b

4.72c

8.73a

12.23c

2015

8.22c

6.19b

4.49c

7.46a

11.94c

2016

8.47c

6.74b

4.86c

8.19a

12.89c

Average

8.42c

6.50b

4.69c

8.12a

12.35c

  1. Means followed by the same letters do not differ significantly (p > 0.05)
  2. DhA dehydrogenases in mg TPF·kg−1·d−1, PhacA and PhalA acid and alkaline phosphatase in mg PNP·kg−1·h−1, UA urease in mg N-NH4+·kg−1·h−1, PA protease in mg tyrosine kg−1·h−1.