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九龙江口红树林土壤微生物的类群及抗菌活性

, PP. 133-141

Keywords: 微生物区系,抗菌活性,土壤,红树林

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Abstract:

研究了九龙江口的秋茄(Kandeliacandel)林和白骨壤(Avicenniamarina)林两个红树林群落及其相应对照光滩土壤微生物的类群及抗菌活性.对微生物类群的研究结果表明:九龙江口红树林区土壤细菌中,芽孢杆菌(Bacillus)是最占优势的属;放线菌以小单胞菌属(Micromonospora)最具优势;其次是链霉菌属(Streptomyces),从秋茄林到白骨壤林,由于潮位降低,小单胞菌比例增加,而链霉菌比例下降;丝状真菌以半知菌占绝对优势,木霉(Trichoderma)、曲霉(Aspergillus)和青霉(Penicillum)是最常见的属;随着土壤深度的增加,微生物的类群减少,但芽孢杆菌和小单胞菌的相对比例增加;红树林土壤微生物类群比对照光滩丰富,缘于林内土壤营养与微生物的栖息条件比光滩优越.对抗菌活性研究表明:土壤真菌的抗菌活性低,抗菌谱窄;放线菌的抗菌活性高,抗菌谱宽,具有抗菌活性的放线菌多为小单胞菌,小单胞菌是一类值得重视的放线菌.

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