Table 3.

Soil enzyme activities in the rhizosphere soil of maize (M) and rice (R) in different saline–alkali fields.

Sampling sites	Catalase (mg g−1)	Invertase (mg g−1)	Amylase (mg g−1)	β-glucosidase (mg g−1)
M1	5.60 ± 0.14Aa	6.14 ± 0.08Ab	1.39 ± 0.02Ac	0.57 ± 0.03Ad
M2	4.97 ± 0.21Ba	5.54 ± 0.06Bb	0.99 ± 0.02Bc	0.54 ± 0.01Ad
M3	4.38 ± 0.11Ca	4.54 ± 0.06Cb	0.96 ± 0.03Bc	0.52 ± 0.04Ad
P1	7.58 ± 0.09Aa	5.62 ± 0.05Ab	1.89 ± 0.05Ac	0.49 ± 0.03Ad
P2	6.54 ± 0.11Ba	5.30 ± 0.08Bb	1.81 ± 0.04Ac	0.49 ± 0.03Ad
P3	6.29 ± 0.16Ba	3.41 ± 0.03Cb	1.45 ± 0.04Cc	0.44 ± 0.01Ad

Capital letters indicate the significance of the same crop in different fields(P < 0.05) and lowercase letters indicate the difference in soil enzyme activities of the same crop in the same field (P < 0.05).