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Although, grazing is a common utilization pattern of grassland,
little information is available about the effect of grazing intensity on microorganism
quantity and microbial biomass of soil in grassland under protection forest.
The present study was conducted to investigate the effect of grazing intensity
on microorganisms and microbial biomass of soil in grassland under protective
forest of Songnen plain. The grassland was divided into different part treated
with Non-Grazing (NG), Light Grazing (LG), Moderate Grazing (MG), Severe Grazing
(SG) and Extreme Grazing (EG), respectively. Three sampling points were selected
in each grazing treatment site and soil samples (0-10 cm depth) were collected
five times at each sampling points. Plate-counting technique was used to analyses
soil microorganism quantity. MBC and MBN of soil were determined using the Chloroform-Fumigatione
Extraction Method. The results showed that LG and MG could significantly increase
quantity of microorganism, MBC and MBN of soil while SG and EG significantly
decrease them. These results demonstrated the importance of moderate grazing
in grassland under protection forest of Songnen plain.
