The activities of soil urease, phosphatase, saccharase, and catalase in loam and clay soil were shown in Figures 4, 5, 6, and 7 and Table 1.
Seen from Table 3, DTNT values of urease, phosphatase, and saccharase activities in loam were lower than those in clay.
Seen from the average values of each enzyme activity in clay and loam soil, the four enzyme activities followed the order of urease > phosphatase > catalase > saccharase. Of the average of all soil depths, urease activity of clay was lower than that of loam by 8.6% and the difference reached significant level (P < 0.05).
Urease, phosphatase, and saccharase activities of DT were higher than DNT.
With the increasing of soil depth, urease, saccharase, and phosphatase activities all decreased (Figures 4, 5, and 6).