运用多隔层根箱研究黑麦草根际微域中芘的降解
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广东省自然科学基金团队项目(06202438)和中山大学985工程环境污染控制与修复技术创新平台项目资助


Degradation of pyrene in the rhizosphere of ryegrass ( Lolium perenne L.) in a rhizobox
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    摘要:

    采用多隔层根箱,通过尼龙撩网插片的控制,实现根室土(S0)、离根室0~2 mm(S1)、2~4 mm(S2)、4~6 mm(S3)及>6 mm(S4)各室层土壤的分离采集,测定各室层土壤可提取态芘含量、土壤微生物生物量碳、土壤基础呼吸强度、微生物熵、代谢熵、脱氢酶和多酚氧化酶活性。结果表明:种植黑麦草处理的各室层内土壤可提取态芘含量存在显著的不同,可提取态芘含量在各室层的大小顺序为S4>S3>S0>S2>S1;各室层土壤微生物生物量碳、土壤基础呼吸强度、微生物熵、代谢熵、脱氢酶和多酚氧化酶活性表现出与可提取态芘含量变化相反的趋势。未种植黑麦草处理的各室层土壤可提取态芘含量、土壤微生物生物量碳、土壤基础呼吸强度、微生物熵、代谢熵、脱氢酶和多酚氧化酶活性没有差异。种植黑麦草处理各室层土壤可提取态芘含量与土壤微生物生物量碳、土壤基础呼吸强度、微生物熵、代谢熵、脱氢酶活性和多酚氧化酶活性之间均存在显著的负相关性(p<0.05)。主成分分析结果表明种植黑麦草处理土壤微生物活性在各室层间发生了明显的变化.

    Abstract:

    A greenhouse experiment was conducted by using a specially designed rhizobox where ryegrass (Lolium perenne L.) seedlings were grown for 60 days in a soil treated with pyrene at a rate of 100 mg kg-1 soil to investigate rhizosphere effects on degradation of pyrene in the soil. The soil in the rhizobox was divided into several compartments separated with nylon mesh. Soil samples were collected in the root compartment (S0), and other compartments 0~2mm (S1), 2~4mm (S2), 4~6mm (S3), and >6mm (S4) for determination of extractable pyrene concentrations, soil microbial biomass C, soil basal respiration rate, microbial biomass C/organic C, and metabolic quotient, dehydrogenase activity and polyphenol oxidase activity. Results show that significant differences were observed between the compartments in extractable pyrene concentrations in treatments with ryegrass and they followed the order: S4 >S3 >S0 > S2> S1. However, an opposite trend in variation was found with soil microbial biomass C, soil basal respiration rate, microbial biomass C/organic C, and metabolic quotient, dehydrogenase activity and polyphenol oxidase activity. Between treatments without ryegrass, no difference was detected in extractable pyrene concentration, soil microbial biomass C, soil basal respiration rate, microbial biomass C/organic C, and metabolic quotient, dehydrogenase activity and polyphenol oxidase activity. Negative correlations were significant (p <0.05) between the extractable pyrene concentrations and the other six indexes in various sampling zones of soils with growth of ryegrass plants. Results of the principal components analysis show that soil microbial activities changed sharply in all the compartments of the treatments with ryegrass.

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许超,夏北成.运用多隔层根箱研究黑麦草根际微域中芘的降解[J].土壤学报,2009,46(3):426-433. DOI:10.11766/trxb200712260308 Xu Chao, Xia Beicheng. Degradation of pyrene in the rhizosphere of ryegrass ( Lolium perenne L.) in a rhizobox[J]. Acta Pedologica Sinica,2009,46(3):426-433.

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