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首页> 外文期刊>Applied and Environmental Microbiology >Soil Bacterial Community Shift Correlated with Change from Forest to Pasture Vegetation in a Tropical Soil
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Soil Bacterial Community Shift Correlated with Change from Forest to Pasture Vegetation in a Tropical Soil

机译：土壤微生物群落的变化与热带土壤从森林到牧场植被的变化相关

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摘要

The change in vegetative cover of a Hawaiian soil from forest to pasture led to significant changes in the composition of the soil bacterial community. DNAs were extracted from both soil habitats and compared for the abundance of guanine-plus-cytosine (G+C) content, by analysis of abundance of phylotypes of small-subunit ribosomal DNA (SSU rDNA) amplified from fractions with 63 and 35% G+C contents, and by phylogenetic analysis of the dominant rDNA clones in the 63% G+C content fraction. All three methods showed differences between the forest and pasture habitats, providing evidence that vegetation had a strong influence on microbial community composition at three levels of taxon resolution. The forest soil DNA had a peak in G+C content of 61%, while the DNA of the pasture soil had a peak in G+C content of 67%. None of the dominant phylotypes found in the forest soil were detected in the pasture soil. For the 63% G+C fraction SSU rDNA sequence analysis of the three most dominant members revealed that their phyla changed from Fibrobacter andSyntrophomonas assemblages in the forest soil toBurkholderia and Rhizobium–Agrobacteriumassemblages in the pasture soil.
机译：从森林到牧场，夏威夷土壤的营养覆盖率发生了变化，导致土壤细菌群落组成发生了显着变化。从两个土壤生境中提取DNA，并通过分析从63％和35％的片段中扩增的小亚基核糖体DNA（SSU rDNA）的系统型丰度，比较鸟嘌呤加胞嘧啶（G + C）含量的丰度。 G + C含量，并通过系统发育分析对占63％的G + C含量的主要rDNA克隆进行分析。这三种方法都显示出森林和牧场栖息地之间的差异，这提供了证据表明植被在三个分类单元级别上都对微生物群落组成有很强的影响。森林土壤DNA的G + C含量峰值为61％，而牧场土壤的DNA的G + C含量峰值为67％。在牧场土壤中未检测到森林土壤中发现的主要系统型。对三个最主要成员的63％G + C分数SSU rDNA序列分析表明，它们的菌群从森林土壤中的纤维杆菌和肉单胞菌组合变为牧场土壤中的伯克霍尔德氏菌和根瘤菌-农杆菌组合。

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