Study On Rhizosphere And Non-rhizosphere Soil Enzymes Activity In Agru-forestry Models In Sichuan Basin Hilly Region

In this study, four kinds of Agro-forestry models were chosen in the Sichuan Basin hilly region. Those were Zanthoxylum bungenum Maxim-Lolium perenne, Prunus persica L. var. Nectariana - Lolium perenne, Morus alba - Lolium perenne and Pyrus pyrifolia - Lolium perenne. The experiment used fixed-point sampling and analysis of research methods which comparative studyed the dynamic changes in rhizosphere and non-rhizosphere soil enzymes activity. As well as the correlation coefficients among rhizosphere soil enzyme activity and rhizosphere soil pH value, organic matter, total N. The results were as follows:1. Rhizosphere and non-rhizosphere soil enzymes activity in four kinds of Agro-forestry models had a clear seasonal trend, with the changes in the month showed an increase after the first downward trend. Rhizosphere effect was obviously. The activity of rhizosphere soil enzymes was higher than non-rhizosphere soil enzymes activity. The peak value of polyphenoloxidase activity in four kinds of Agro-forestry models appeared in September. The peak values of rhizosphere and non-rhizosphere soil peroxidase, Phosphatase, Saccharase and urease activity in each model appeared in different month.2. Rhizosphere soil enzymes activity at different sampling points had the similar rule. Rhizosphere soil enzymes activity at the A-point (tree crown projection between the lines position) was higher than rhizosphere soil enzymes activity at the B-point (the center of the lines between tree crown projection between the lines position and trunk base) in each month. The rule of non-rhizosphere soil enzymes activity at all sampling points was inconsistent.3. Rhizosphere and non-rhizosphere soil pH values in July (summer) in four kinds of Agro-forestry models were lower than in April (spring) and September (autumn). Rhizosphere and non-rhizosphere soil organic matters in July (summer) in four kinds of Agro-forestry models were higher than in April (spring) and September (autumn). Rhizosphere and non-rhizosphere soil total nitrogens in July (summer) in four kinds of Agro-forestry models were higher than the remaining two months except rhizosphere soil total nitrogen in Morus alba - Lolium perenne model.4. Rhizosphere and non-rhizosphere soil enzymes activity was overall highest in Prunus persica L. var. Nectariana - Lolium perenne model and lowest in Pyrus pyrifolia - Lolium perenne model. Rhizosphere and non-rhizosphere soil organic matter and total nitrogen was overall higher in Prunus persica L. var. Nectariana -Lolium perenne and Morus alba - Lolium perenne models than in Zanthoxylum bungenum Maxim-Lolium perenne and Pyrus pyrifolia - Lolium perenne models.5 There was a negative correlation between soil pH value and soil enzymes activity. Soil Phosphatase and urease activity was negatively correlated with soil pH value. The remaining three kinds of soil enzymes activity was not significantly related with soil pH value. Soil organic matter, total nitrogen and soil enzymes activity were positively correlated. Soil polyphenoloxidase activity was negatively correlated with soil organic matter and total nitrogen. The remaining four kinds of soil enzymes activity was significantly related with soil organic matter and total nitrogen.