Applied and Environmental Soil Science / 2018 / Article / Fig 2

Research Article

Annual Variation in Soil Enzyme Activity in a Paddy Field: Soil Temperature and Nutrient Availability Are Important for Controlling Enzyme Activities

Figure 2

Annual variations in enzyme activities involved in C, N, P, and S cycling (a) and the ratios of N-, P-, and S-acquiring enzymes to β-D-glucosidase activity (b). (a) Filled triangle, arylsulfatase (µmol p-nitrophenol g−1·h−1); open circle, L-asparaginase (µmol NH4+-N g−1·h−1); filled circle, acid phosphatase (µmol p-nitrophenol g−1·h−1); open triangle, β-D-glucosidase (µmol p-nitrophenol g−1·h−1). (b) Open circle, ratio of L-asparaginase to β-D-glucosidase activity; filled triangle, ratio of arylsulfatase to β-D-glucosidase activity; filled circle, ratio of acid phosphatase to β-D-glucosidase activity. Data points represent means, and the error bars represent standard deviations.

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