Abstract:

In order to investigate the soil biological characteristics in Beijing chestnut orchards and evaluate their roles in soil available nutrients, the authors collected 24 surface soil samples from different chestnut orchards of Beijing and analyzed soil microbial biomass C, P and protozoa. The results showed that soil microbial biomass C ranged from 33.21-128.55 mg/kg, 90.63 mg/kg on average. Most soils had smaller than 100 mg/kg of microbial biomass C. Soil microbial biomass P was 3.41-14.92 mg/kg, means 8.63 mg/kg, most soils from 5 to 10 mg/kg. Turnover of soil microbial biomass could meet the requirement of chestnut plant for P, but not N. These soils contained a number of flagellata, but a small quantity of ciliates and amoeba.