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中文摘要：
通过对上海市区6种林型沿海防护林的土壤养分和三大类群土壤微生物（细菌、真菌、放线菌）数量的动态特征进行研究，结果表明：（1）不同土壤层次三大类群微生物数量变化均较大，土壤表层（0～10cm）的细菌数量是底层（40～60cm）的2．33—3．67倍；土壤表层（0—10cm）的真菌数量是底层（40～60cm）的2．21～3．75倍；土壤表层（0～10cm）的放线菌数量是底层（40～60cm）的1．29～2．26倍；（2）不同林型下土壤三大类群微生物数量的季节变化各有其自身特点，变化趋势不一致；（3）三大类群微生物数量从多到少的顺序为：细菌、真菌、放线菌，细菌在土壤微生物中占有绝对优势；（4）不同林型的表层土壤（0—10cm）中微生物总量差异较大，年内总量从大到小表现为：杨树、杨树＋麻栎、榆树＋榉树、水杉＋杨树、东方杉、水杉、滩地。
英文摘要：
The number and distributions of soil microorganisms （bacteria, fungi and actinomycetes） and soil fertility factors of six different forest types were studied. The results obtained were as follows ： （ 1 ） The quantities of microbe were different at different soil depth. The amounts were much higher within 0 -10 cm than that within 40 -60 cm （bacteria were 2.33 -3. 67 times, fungi were 2.21 -3.75 times and actinomycetes were 1.29 -2.26 times）. （2）The distribution of microorganisms was also different from each other in different forest types at different seasons. （ 3 ） Number from largest to smallest in order of bacteria, fungi, actinomycetes. Bacteria were the absolute superiority in soil microorganisms. （4）Total number of microorganisms in 0 - 10 cm soil layer was much different among every forest type and the total from biggest to smallest were as follows ： Populus , Populus ＋ Quercus acutissima , Ulmus pumila ＋ Zelkova schnideriana , Metasequoia glyptostoboides ＋ Populus , Taxodium mucronatum × Crytomeria fortunei , Metasequoia glyptostoboides , Beach.
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