选取不同种植年限蔬菜大棚、露天菜地和一般农田,测定了土壤微生物主要类群数量。结果表明:大棚菜地土壤微生物数量大于露天菜地和一般农田土壤,随着种植年限的延长大棚菜地土壤中细菌和真菌数量逐渐减少;放线菌数量随着种植时间的延长1-7 a内有增加的趋势;7年以上都有所降低。 Select different planting years vegetable greenhouse, open-air vegetable fields and general farmland, the determination of the main soil microbial population. The results showed that the quantity of soil microorganisms in greenhouse vegetable was larger than that in open vegetable field and common farmland soil. The number of bacteria and fungi in the vegetable garden soil decreased gradually with the increase of planting time. The number of actinomycetes increased with planting time 1-7 a There has been an increase in the trend; it has been reduced for more than seven years.