Soil fertility is determined by biological diversity at all levels of life, from genes to entire biocenoses. The aim of this study was to evaluate bacterial diversity in soil contaminated with Cd²⁺, Co²⁺ and Ni²⁺ and sown with Brassica napus. This is an important consideration because soil-dwelling microorganisms support phytoremediation and minimize the adverse effects of heavy metals on the environment. Microbial counts, the influence (IF_HM) of Cd²⁺, Co²⁺ and Ni²⁺ on microorganisms, the colony development (CD) index, the ecophysiological diversity (EP) index and genetic diversity of bacteria were determined under controlled conditions. Soil contamination with Cd²⁺, Co²⁺ and Ni²⁺ significantly influenced microbial diversity and increased the values of CD and EP indices. The tested heavy metals decreased the genetic diversity of bacteria, in particular in the phyla Actinobacteria and Proteobacteria. Bacteria of the genera Arthrobacter, Devosia, Kaistobacter, Paenibacillus, Phycicoccus, Rhodoplanes and Thermomonas were identified in both contaminated and non-contaminated soil. These bacteria are highly resistant to soil contamination with Cd²⁺, Co²⁺ and Ni²⁺.

中文翻译：

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甘蓝型油菜播种土壤微生物组对镉，钴和镍污染的响应

土壤肥力是由生命的各个层面（从基因到整个生物调查）的生物多样性决定的。这项研究的目的是评估被甘蓝型油菜播种的Cd 2 ⁺，Co ²⁺和Ni ²⁺污染的土壤中的细菌多样性。这是一个重要的考虑因素，因为居住在土壤中的微生物支持植物修复并最大程度地减少重金属对环境的不利影响。微生物数量，Cd 2 ⁺，Co ²⁺和Ni ²⁺的影响（IF _HM）在微生物上，在受控条件下确定了菌落发育（CD）指数，细菌的生态生理多样性（EP）指数和遗传多样性。Cd 2 ⁺，Co ²⁺和Ni ²⁺对土壤的污染显着影响了微生物的多样性，并增加了CD和EP指数的值。测试的重金属降低了细菌的遗传多样性，特别是在门系放线菌和变形杆菌中。节杆菌属，达沃斯属，凯斯特菌属，芽孢杆菌属，菌球菌，杜鹃花属和嗜热菌属的细菌在受污染和未受污染的土壤中均被鉴定出来。这些细菌对Cd 2 ⁺，Co ²⁺和Ni ^2+的土壤污染具有高度抵抗力。