This study shows that the geogenic factors landform, lithology, and underlying mineral deposits (expressed by elevated metal concentrations in overlying soils) are key drivers of microbial community diversity in naturally metal-rich Australian soils with different land uses, i.e., agriculture versus natural bushland. One hundred sixty-eight soil samples were obtained from two metal-rich provinces in Australia, i.e., the Fifield Au-Pt field (New South Wales) and the Hillside Cu-Au-U rare-earth-element (REE) deposit (South Australia). Soils were analyzed using three-domain multiplex terminal-restriction-fragment-length-polymorphism (M-TRFLP) and PhyloChip microarrays. Geogenic factors were determined using field-mapping techniques and analyses of >50 geochemical parameters. At Fifield, microbial communities differed significantly with geogenic factors and equally with land use (P P 0.2 m) differed significantly with lithology and mineral deposit (P < 0.05). Across both sites, elevated metal contents in soils overlying mineral deposits were selective for a range of bacterial taxa, most importantly Acidobacteria, Bacilli, Betaproteobacteria, and Epsilonproteobacteria. In conclusion, long-term geogenic factors can be just as important as land use in determining soil microbial community diversity.
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机译：这项研究表明，地理因素，地貌，岩性和潜在的矿床沉积物（以上覆土壤中的金属浓度升高为特征）是不同土地用途（例如农业与天然林地）的天然金属丰富的澳大利亚土壤中微生物群落多样性的关键驱动力。 。从澳大利亚的两个金属含量丰富的省（即菲菲尔德Au-Pt田（新南威尔士州）和山坡Cu-Au-U稀土元素（REE）矿床（南部）获得了168个土壤样品。澳大利亚）。使用三域多重末端限制片段长度多态性（M-TRFLP）和PhyloChip微阵列分析土壤。使用田间制图技术并分析了> 50个地球化学参数，确定了成因。在菲菲尔德（Fifield），微生物群落因成因因素而有显着差异，而土地利用（P P 0.2 m）也因岩性和矿藏而显着不同（P <0.05）。在这两个站点上，覆盖矿床的土壤中金属含量的升高对一系列细菌类群具有选择性，其中最重要的是酸性细菌，芽孢杆菌，β变形杆菌和Epsilon变形细菌。总之，在确定土壤微生物群落多样性方面，长期的地质成因可能与土地利用同样重要。
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