窖泥细菌群落结构演替及其与环境因子的相关性

利用PCR-DGGE系统研究了剑南春不同窖龄(2～50年)窖泥的微生物群落结构、种群演替趋势及其与环境因子的相关性。结果表明,2年窖龄窖泥的细菌丰度和多样性指数与5年样品相似,而10年窖龄窖泥的细菌丰度和多样性指数则明显增加,之后的10年基本持平,但50年时又显著下降。相同窖龄的窖泥样品中,中层的物种丰度和多样性指数均高于上层和下层,特别是在2～5年样品中这一趋势更加明显。DGGE和序列分析显示,窖泥中优势种群均分布在厚壁菌门(Phylum Firmicutes)的杆菌纲(Class Bacill)和梭菌纲(Class Clostrida),其中耐酸乳杆菌(Lactobacillus acetotolerans)、芽孢菌(Bacillus fordii)、未培养的瘤胃菌(uncultured Ruminococcaceae bacterium)和梭菌(uncultured Clostridia bacterium)为窖泥样品中的主要优势种群。典型对应分析显示,窖泥微生物群落结构与环境因子具有显著的相关性,其中有效磷、氨氮、pH对微生物群落结构的影响较大,其次是腐殖质,而水分含量的影响较小。

Succession of Bacterial Community in Pit Mud and Its Correlations with Environmental Factors

Bacterial community succession in pit mud of different age(from 2 years to 50 years)in Jiannanchun Group and its correlations with environmental factors were systematically studied by PCR-DGGE methods.The results were as follows: bacterial abundance and bacterial diversity index displayed high similarity between 2-year-old and 5-year-old pit mud samples,however,they increased obviously in 10-year-old pit mud samples and then kept stable in 20-year-old pit mud samples,and then dramatically declined in 50-yea...