Characteristic Study on Soil Enzyme Activities of Shelter forest for Farmland in Xuhuai Plain Area

This paper mainly deals with the characteristics of soil enzyme activities and the influence of tree root system on soil enzymes. The conclusions are as follows:(1)The relationship between the soil enzyme activities is close. The soil enzyme activities near the shelter forest are much stronger than those in the farther place. (2)The vertical variation rules are complex,the activities of invertase and alkaline phosphatase are on a decline from the surface soil to deep soil. Near the shelterforest,the activities of urease and protease are the highest at 0～10 cm and 20～40 cm respectively whereas in the farther place their values decline from the surface to deep soil. The enzyme activities of rhizosphere soil are stronger than those of non rhizosphere soil. (3) Tree root system,especially the root the diameter of which is thinner than 1 mm,could remarkably increase the soil enzymes activities.