在烤烟生长过程中，根际微生物的数量随生育时期不同而变化。
The amount of rhizosphere microorganisms changed with growth periods of tobacco.
秸秆覆盖增加了梨园土壤微生物的数量，增强土壤微生物活性。
Straw mulching improved the quantity of soil microbe and activity of soil microbe.
污染物生物降解的速率和程度与微生物的数量和活性关系密切。
The rate and degree of biodegradation were highly related to the number and activity of bacteria.
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