Preliminary Study on Dynamics of Biological Activity Factors of Cherry Rhizosphere

The dynamic properties of enzyme activities and the number of microorganism and main available nutrients were measured in rhizosphere of cherry applying pot culturing tests.The results showed that the activities of urease and phosphatase were the highest in the fast-growing period of shoot which had apparent rhizosphere effect,and decreased gradually with the phonological progress,while the peroxidase activity increased first and decreased later,which indicated minus rhizosphere effect.The dynamic variations of bacteria,fungi and actinomyce were familiar in rhizosphere which were low,high,low.The number of bacteria and actinomyce was the highest in the with hold-growing period of shoot and the number of fungi was the highest in the defoliation period,the actinomyce had apparent rhizosphere effect.The available nutrients decreased in the growing season,available N was depleted and available P,K were enriched in rhizosphere,which decreased gradually with the phonological progress.The correlation between enzyme in rhizosphere and soil nutrient was high while that between quantifies of microorganisms and soil nutrient enzyme activities was low.