Andressa Cristhy Buch, Krishna Kumar Yadav, Douglas B Sims, Maria Elizabeth Fernandes Correia, Eduardo Duarte Marques, Ahmad J Obaidullah, Emmanoel Vieira Silva-Filho
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引用次数: 0
摘要
溃坝造成的尾矿污染严重影响了河岸生态系统及其相互联系。本研究评估了Córrego do feij o矿（CFM）溃坝对200公里采样区微生物群落的影响。测量了生物化学、土壤学和生态学参数，包括细菌系统发育、丰度和多样性。溃坝及其周边地区微生物多样性和菌落形成单位（CFU）均低于对照区。金属浓度显著影响土壤学和生物学参数，特别是细菌组成、代谢商、呼吸、酶活性和氮循环。生态毒性试验显示，在污染严重的地区，脱氢酶活性受到更大的抑制，这表明与巴西偶氮螺旋菌相比，球形节杆菌的敏感性更高。假单胞菌科和酸杆菌科，以及变形菌门、酸杆菌门、放线菌门和厚壁菌门是最丰富的，显示出对泄漏后环境条件的恢复能力。微生物活动的变化表明生态系统服务可能减少或丧失，损害土壤功能和质量。这些发现有助于在矿山污泥污染场地选择最合适的当地土壤微生物进行生物监测和生物修复。
Effects of mine tailings on the structure and diversity of microbial communities in riparian soils.
Mine tailing contamination from dam failures severely impacts riparian ecosystems and their interlinkages. This study assessed the effects of the Córrego do Feijão Mine (CFM) dam rupture on microbial communities across a 200 km sampling area. Biochemical, pedological, and ecological parameters were measured, including bacterial phylogeny, abundance, and diversity. The collapsed dam and surrounding areas exhibited the lowest microbial diversity and cultured colony-forming units (CFU) compared to reference sites. Metal concentrations significantly influenced pedological and biological parameters, especially bacterial composition, metabolic quotient, respiration, enzymatic activities, and nitrogen cycling. Ecotoxicity tests revealed greater inhibition of dehydrogenase activity in heavily contaminated areas, indicating a higher sensitivity of Arthrobacter globiformis compared to Azospirillum brasilense. The Pseudomonadaceae and Acidobacteriaceae families, along with the Proteobacteria, Acidobacteriota, Actinobacteriota, and Firmicutes phyla, were the most abundant, demonstrating resilience to post-spill environmental conditions. Changes in microbial activities suggest a potential reduction or loss of ecosystem services, compromising soil functionality and quality. These findings aid in selecting the most suitable local soil microorganisms for biomonitoring and bioremediation in mining sludge-contaminated sites.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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