All the indexes of the second generation in the soil microorganism quantity, biomass, biochemistry activity and the change of soil enzyme activity of P. massoniana under the same condition are higher than those of the first generation.

• 结果表明，二代马尾松林土壤微生物数量、微生物生物量碳强度、呼吸作用强度、硝化作用强度、蔗糖酶以及过氧化氢酶活性均高于一代马尾松林。