TABLE 2.

Enzyme activities in Bothriochloa ischaemum litter over different phytoremediation years.

Enzyme activity	S523	S536	S560
Urease [mg/(g⋅24 h)]	2.35 ± 0.42a	0.86 ± 0.38b	0.36 ± 0.31b
Sucrase [mg/(g⋅24 h)]	12.25 ± 1.22a	1.30 ± 0.19b	2.53 ± 1.00b
Catalase [mg/(g⋅20 min)]	1.78 ± 0.15b	4.02 ± 0.84a	2.16 ± 0.48ab
Cellulase [mg/(g⋅72 h)]	0.57 ± 0.09c	1.14 ± 0.12b	1.38 ± 0.07a
Polyphenol oxidase (mL/g)	4.80 ± 0.84b	5.70 ± 0.55a	5.20 ± 0.45ab

Data are means ± standard deviation. Different letter cases indicate that the means are significantly different over different phytoremediation years. Significant differences between sites (P < 0.05) are represented by letters (a > b > c).