In three treatments for
planting mulch grasses and green manure as well as clear tilling respectively, the enzyme
activity(except
polyphenol oxidase) of surface soil(0～20cm) is higher than those of sub surface soil, showing that there is obvious different layers in enzyme activity
Planting mulch grasses and green manure are much effectively to raise urease and phosphorylase activity on surface soil between rows,to decrease polyphenol oxidase activity down speed in varying degree, showing that there is little different enzyme activity between H 2O 2 enzyme and invert enzyme In surface soil under canopy, soil urease activity in
Planting mulch grasses and green manure is much to raise, soil acidity phosphorylase and over oxidase activity are to go down, meanwhile,to decrease invert enzyme activity down speed There isn't obvious different in sub surface soil enzyme activity between rows and under canopy In enzyme activity statistic of 1997, the analysis showed that urease activity value in surface soil under canopy and polyphenol oxidase activity value in surface soil between rows,have very significant different or significant in different treatments,showing planting mulch grasses > interplanting green manure> clear tilling In the same statistic, regarding H 2O 2 enzyme activity in surface soil under canopy, the result is as follows: clear tilling> planting mulch grasses> interplanting green manure, showing very significant different Meanwhile, preliminary approach has been made in this paper regarding relative coefficient of factors between enzyme activity and soil fertility