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从河北省6个生态区148个县(市)采集土样4637份,分离到苏云金杆菌241株。结果表明苏云金杆菌在不同土壤类型及不同植被条件下的分布有很大差异。草甸褐土中分出率最高,为14%;而粟钙土、湿潮土等分出率较低。仅为2%左右;在风沙土和盐土中未分离到苏云金杆菌。在不同植被种类中以棉花地分出率最高,为13.4%;胡麻、莜麦等地分出率仅为2%左右。
4637 soil samples were collected from 148 counties (cities) in 6 ecological districts of Hebei Province, and 241 strains of Bacillus thuringiensis were isolated. The results showed that the distribution of Bacillus thuringiensis in different soil types and different vegetation conditions are quite different. Meadow cinnamon in the highest rate of 14%; and corn calcareous soil, moist soil and other low rates. Only about 2%; Bacillus thuringiensis was not isolated in bauxite and saline soil. Among the different types of vegetation, the highest rate was cotton, accounting for 13.4%. The output rate of flax and oats was only about 2%.