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佳乐麝香和镉复合污染对土壤中放线菌数量的影响

ISSN号：1000-4890
期刊名称：生态学杂志
时间：0
页码：-
分类：X171.5[环境科学与工程—环境科学]
作者机构：[1]东北大学资源与土木工程学院,沈阳110004, [2]中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室,沈阳110016, [3]沈阳建筑大学市政与环境工程学院,沈阳110168
相关基金：国家自然科学基金项目（40930739、21277150和31370523）资助
相关项目：农田土壤中毒害污染物与生物相互作用机制和风险消减原理

关键词：佳乐麝香, 镉, 复合污染, 土壤放线菌, galaxolide（HHCB）, cadmium, combined pollution, soil actinomycetes.

中文摘要：

佳乐麝香是目前备受关注的PPCPs污染物之一,重金属Cd是土壤中常见的重要污染物,两者在土壤生态系统中存在联合暴露的潜在可能性;放线菌是土壤中分布最广数量最多的一类微生物。本研究在实验室模拟条件下,研究了佳乐麝香（HHCB）和Cd单一、复合污染对持续培养10周土壤中放线菌数量的影响,结果发现,HHCB和Cd单一、复合处理对土壤放线菌数量抑制作用显著（P〈0.01）,随着HHCB浓度的增加,对土壤放线菌数量的抑制作用增加,其浓度-效应关系都呈对数关系,第3周的EC50值最低,前5周的EC50值均不超过10 mg·kg^-1;土壤HHCB和Cd复合污染的联合毒性效应为拮抗作用。本研究表明,在实际风险评价中,应考虑到HHCB输入土壤的特征选择特定的EC50值范围。

英文摘要：

HHCB is one of the most significant PPCPs pollutants concerned by environmental scientists. Meanwhile,Cd is one of the most important heavy metal pollutants existing widely in environment. Combined exposure of HHCB and Cd is possible in the soil ecosystem. However,few studies have been reported regarding the impacts of joint pollution of these two pollutants on soil microbes. In this paper,the joint toxic effects of HHCB and Cd on actinomycetes were studied using soil microcosm for a 10-week duration. Results showed that single and joint effects of HHCB and Cd on actinomycetes quantities in soils were markedly significant（ P 〈0. 01）. The inhibitory effect of actinomycetes quantities in soils increased with the increase of HHCB concentration under both single and combined treatments of HHCB and Cd. The dose-effect relationship between HHCB and the inhibitory rate of actinomycetes quantity in soils was logarithmic. The EC50value was the least in the 3rd week after treatment. In the first 5 weeks of incubation,the EC50values were not more than 10 mg·kg^- 1. It was suggested the joint effects of HHCB and Cd were antagonistic. It could be concluded that the input characteristics of HHCB to soils should be considered for selecting a suitable EC50value for assessing its ecological risks in soils.