Features of soil enzyme activity under different land uses in Ningnan Mountain area

The features of soil enzyme activity under different land uses were studied.The results indicate that the soil enzyme activity of the natural meadow is the highest,that of the bush forest land and the artificial meadow is the next and that of the orchard and farmland is the lowest;there are higher soil enzyme activities at 20～40cm depths of orchard and farmland;the natural meadow and bush forest have an obvious effect on the restoration improvement of soil enzyme activity,but the orchard and farmland are worst;soil sucrase activity obviously varieties in profile,the activities of urease and alkaline phosphatase almost change in a same way and that of hydrogen peroxidase has no obvious difference not only in profile but also under different land uses.There is an extreme positive correlation among the activities of sucrase,urease and alkaline phosphatase,and every of them has an extreme positive relativity with the soil readily available nutrient and organic matter.So soil enzyme activity can be made as one of the soil fertility index.