The Response Of Enzyme Activities To Nitrogen Deposition,Management Type And Biochar Addition In Moso Bamboo Forest

Soil enzyme are important components and active participats in the soil biochemical processes,and thave an important role in the process of material circulation and energy flow in the soil ecosystem.Soil enzyme are important components and active participats in the soil biochemical processes,and have an important role in the process of material circulation and energy flow in the soil ecosystem.Nitrogen deposition,biochar and management practices affect the activity of soil enzyme.Therefore,we studied the effects of different level nitrogen deposition(30,60 and 90 kg N ha-1 yr-1),biochar(20 and 40 t ha-1,BC20 and BC40)and management practices(conventionally managed and intensively managed,CM and IM)on soil enzyme activities in Moso bamboo plantations.The results showed that intensive management significantly increased the activities of ?-fructofuranosidase,cellulase,urease in soil(P<0.001)but decreased the activities of nitrate reductase(P<0.001),and had no significant effect on hydrogen peroxidase.Nitrogen deposition significantly decreased the activities of ?-fructofuranosidase,cellulase,nitrate reductase in soil of both CM and IM and urease activity in IM(P< 0.05),but enhanced the urease activities in CM,and did not significantly effects the activities of hydrogen peroxidase.The combination of N deposition with management type significantly impacted the soil enzyme(P<0.001)except hydrogen peroxidase.BC40 addition alone significantly increased the activity of cellulase and nitrate reductase(P < 0.01),and decreased the activities of ?-fructofuranosidase,urease,and acid phosphatase(P < 0.05),and had no significant effect on hydrogen peroxidase.Biochar addition amplified the negative effect of N deposition on ?-fructofuranosidase and acid phosphatase,but neutralized the negative effect of N deposition on urease,and had no significant effect on other five soil enzyme activities.The results provided an important reference for us to fully understand the response of soil ecosystem of bamboo forest to nitrogen deposition,biochar and management practices.