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首页> 外文期刊>Environmental toxicology and chemistry >ACTIVITY AND POPULATION DYNAMICS OF HETEROTROPHIC AND AMMONIA-OXIDIZING MICROORGANISMS IN SOIL SURROUNDING SLUDGE BANDS SPIKED WITH LINEAR ALKYLBENZENE SULFONATE: A FIELD STUDY
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ACTIVITY AND POPULATION DYNAMICS OF HETEROTROPHIC AND AMMONIA-OXIDIZING MICROORGANISMS IN SOIL SURROUNDING SLUDGE BANDS SPIKED WITH LINEAR ALKYLBENZENE SULFONATE: A FIELD STUDY

机译：线性烷基苯磺酸盐污染土壤污泥带中异养和氨氧化微生物的活性和种群动态：实地研究

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Recent research has documented soil microorganisms to be rather sensitive to linear alkylbenzene sulfonates (LAS), which may enter the soil environment in considerable quantities following sewage sludge disposal. We here report field effects of LAS on selected microbial populations present in a sandy soil surrounding well-defined sludge bands spiked with high but realistic LAS levels (7.1 or 31.3 g/kg). Surprisingly, LAS had no effect on heterotrophic respiration in the sludge compartment per se but stimulated activity and metabolic quotient (microbial activity per unit of biomass) in the surrounding soil. By contrast, autotrophic ammonia oxidation was initially inhibited in the LAS-spiked sludge. This led to dramatic transient increases of NH_4~+ availability in the sludge and surrounding soil, subsequently stimulating soil ammonia oxidizers. As judged from a Nitrosomonas europaea bioluminescence toxicity assay, however, LAS or other sludge components never accumulated to toxic levels in the soil compartments and the LAS tolerance of the indigenous microbes further remained unchanged following LAS exposure. LAS effects on the investigated microbial populations largely occurred during the first two months and were confined to soil closer than 30 mm from LAS-spiked sludge. Our results strongly suggest that disposal of LAS-contaminated sludge does not pose a major risk to the function of the soil microbial community under field conditions.
机译：最近的研究表明，土壤微生物对线性烷基苯磺酸盐（LAS）相当敏感，而线性烷基苯磺酸盐在处理污水污泥后可能会大量进入土壤环境。我们在这里报告了LAS对选定的微生物种群的现场影响，这些微生物种群存在于明确界定的污泥带周围的沙质土壤中，掺入了较高但实际的LAS水平（7.1或31.3 g / kg）。令人惊讶的是，LAS对污泥室本身的异养呼吸没有影响，但是刺激了周围土壤的活性和代谢商（每单位生物量的微生物活性）。相反，在LAS加标的污泥中最初会抑制自养氨氧化。这导致污泥和周围土壤中NH_4〜+的可利用性急剧增加，随后刺激了土壤氨氧化器。但是，根据欧洲亚硝化单胞菌生物发光毒性试验的判断，LAS或其他污泥成分从未在土壤室中积累到有毒水平，并且暴露于LAS后，土著微生物对LAS的耐受性进一步保持不变。 LAS对被调查微生物种群的影响主要发生在前两个月，并且仅限于距离LAS掺加污泥不到30毫米的土壤。我们的结果强烈表明，在野外条件下，被LAS污染的污泥的处置不会对土壤微生物群落的功能造成重大风险。

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