五氯酚(PCP)污染土壤模拟根际的修复  

Stimulated rhizo-remediation on pentachlorophenol (PCP) polluted soil

作　　者：何艳[1] 徐建民[1] 汪海珍[1] 吴愉萍[1] 陈菁青[1] 

机构地区：[1]浙江大学土水资源与环境研究所,浙江杭州310029

出　　处：《中国环境科学》2005年第5期602-606,共5页China Environmental Science

基　　金：国家杰出青年科学基金资助项目(40425007)

摘　　要：模拟根际环境条件下,研究了根系分泌物对五氯酚(PCP)污染土壤的修复效应及其机理.结果表明,PCP的土壤残留消解行为随根系分泌物添加剂量的不同显现相应差异.土壤中微生物生物量碳(Cmic),氮(Nmic),碳氮比(Cmic/Nmic),微生物商及酶等土壤生化指标与PCP的消解均存在一定程度的相关性.低剂量(13.38TOCmg/kg)处理,PCP土壤甲醇可提态残留量最小,修复效应最佳,此时土壤微生物生物量碳,氮,微生物商,脱氢酶活性等显现最大响应,为最适根系分泌物添加剂量.修复机理可能在于其诱导的土壤环境质量友好演变过程.逐步回归分析结果显示,微生物生物量氮,微生物商及脱氢酶活性可作为表征根际修复PCP污染土壤时土壤环境质量友好演变过程的敏感生物学指标.The remediation effect and mechanisms of root exudates in rhizo-remediation on a pentachlorophenol （PCP） polluted soil were studied under the condition of stimulated rhizo environment. Soil residual dispelling behavior of PCP revealed correspondent difference with the difference of adding doses of root exudates. There existed corelativity of definite degree between the dispelling of PCP and the soil biochemical indices of microbial biomass carbon （Cmin）, nitrogen （Nmic）, carbon nitrogen ratio （Cmic/Nmic）, microbial quotient and enzyme in soil. In the low dose （13.38TOC mg/kg） treatment, the PCP soil methanol residual amount was smallest; remediation effect was best; at this time, the soil microbial biomass carbon, nitrogen, microbial quotient, dehydrogenase activities showed greated respond. For the most suitable root exudate adding dose, the remediation mechanism might be at its induced soil environment quality friendly evolution process. The microbial biomass nitrogen, microbial quotient dehydrogenase activities might be the sensitive biological index evidencing soil environmental quality friendly evolution process at rhizo-remediative PCP polluted soil.

关 键 词：五氯酚(PCP) 根系分泌物 微生物生物量 土壤酶 

分 类 号：X131.3[环境科学与工程—环境科学]