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首页> 外文期刊>Journal of environmental sciences >Effects of plant species coexistence on soil enzyme activities and soil microbial community structure under Cd and Pb combined pollution
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Effects of plant species coexistence on soil enzyme activities and soil microbial community structure under Cd and Pb combined pollution

机译：镉铅复合污染下植物物种共存对土壤酶活性和土壤微生物群落结构的影响

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摘要

The relationship between plant species coexistence and soil microbial communities under heavy metal pollution has attracted much attention in ecology. However, whether plant species coexistence could offset the impacts of heavy metal combined pollution on soil microbial community structure and soil enzymes activities is not well studied. The modified ecological dose model and PCR-RAPD method were used to assess the effects of two plant species coexistence on soil microbial community and enzymes activities subjected to Cd and Pb combined stress. The results indicated that monoculture and mixed culture would increased microbe populations under Cd and Pb combined stress, and the order of sensitivity of microbial community responding to heavy metal stress was: actinomycetes > bacteria > fungi. The respirations were significantly higher in planted soil than that in unplanted soil. The plant species coexistence could enhance soil enzyme activities under Cd and Pb combined. Furthermore, planted soil would be helpful to enhance soil genetic polymorphisms, but Cd and Pb pollution would cause a decrease on soil genetic polymorphisms. Mixed culture would increase the ecological dose 50% (ED_(50)) values, and the ED_(50) values for soil enzyme activities decreased with increasing culture time. The dehydrogenase was most sensitive to metal addition and easily loses activity under low dose of heavy metal. However, it was difficult to fully inhibit the phoshpatase activity, and urease responded similarly with phosphatase.
机译：重金属污染下植物物种共存与土壤微生物群落之间的关系引起了生态学的广泛关注。然而，还没有很好地研究植物物种共存是否可以抵消重金属复合污染对土壤微生物群落结构和土壤酶活性的影响。利用改良的生态剂量模型和PCR-RAPD方法评估了两种植物共存对Cd和Pb联合胁迫下土壤微生物群落和酶活性的影响。结果表明，单培养和混合培养会增加镉和铅联合胁迫下的微生物种群，微生物群落对重金属胁迫的敏感性顺序为：放线菌>细菌>真菌。种植土壤中的呼吸显着高于未种植土壤中的呼吸。在Cd和Pb结合下，植物物种共存可以增强土壤酶活性。此外，种植的土壤将有助于增强土壤遗传多态性，但Cd和Pb污染将导致土壤遗传多态性降低。混合培养会使生态剂量增加50％（ED_（50））值，土壤酶活性的ED_（50）值随培养时间的增加而降低。脱氢酶对金属的添加最敏感，在低剂量的重金属下很容易失去活性。但是，难以完全抑制磷酸酶的活性，脲酶与磷酸酶的反应相似。

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