摘要
Benzo(a)pyrene(B[a]P)是具有"三致"效应的有机污染物,正在以叠加的方式在土壤中逐步累积,对土壤环境质量造成严重威胁。采用叠加实验的方法模拟B[a]P在土壤中的累积过程,研究B[a]P累积污染后的有效性特征及其对土壤呼吸强度的影响。结果表明:在叠加和一次污染方式下,土壤B[a]P可提取含量和有效含量随培养时间的延长呈现初始(1～28 d)下降速率较快,而后(28～56d)逐渐减缓的趋势。在叠加污染条件下,土壤B[a]P可提取量比一次污染条件下降低了34.50%～57.29%,土壤B[a]P有效含量则比一次污染低19.00%～43.80%。土壤呼吸强度随B[a]P培养时间的延长呈现出先减弱,而后逐渐恢复的规律。在两种污染方式下,土壤呼吸强度在前7 d比实验开始时(1 d)减弱了14.38%～35.80%,在8～56 d逐渐恢复并稳定在11.51～15.69 mg·kg-1·h-1之间。土壤呼吸强度随土壤B[a]P有效性的变化而改变,两者呈正相关。研究结果为土壤B[a]P叠加累积污染的生态毒性研究提供科学依据。
As one of the persistent organic pollutants with strong carcinogenic, teratogenic and mutagenic effect, benzo(a) pyrene(B[a]P) is gradually accumulating in soil and posing a serious threaten to soil environment quality. The B[a]P bioavailability and its impacts on soil respiration were investigated under simulated condition by using the superimposed method. Results indicated that contents of extractable and available B[a]P sharply declined in the first 28 d(0～28 d) , and then slowly decreased between 28 d and 56 d incubation time under both superimposed and one-time pollution method. Soil extractable and available B[a]P in superimposed pollution tests were 34.50%～57.29% and 19.00%～43.80% lower than that in the one-time pollution method, respectively. Soil respiration intensity decreased by 14.38% to 35.80% in the first 7 d incubation period, and then gradually recovered and kept stable between 11.51 mg·kg-1 ·h-1 and 15.69 mg·kg-1·h-1 at the end of the incubation time. In both superimposed and one-time pollution tests, the positive correlation relationship between soil available B[a]P and soil respiration intensity was testified in the whole incubation period. Results from this work provide a crucial data for evaluating ecological toxicity of soil B[a]P accumulative pollution.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第2期259-266,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金(41071158)
作者简介
郑彬（1986-），男，安徽淮北人，硕士研究生，主要从事土壤环境化学与污染毒理学方面的研究工作。E—mail：zhengbin0206@163．com
通信作者：郜红建E-mail：hjgao@ahau．edu．cn
