| .B[a]P累积污染对土壤呼吸强度的影响[J].农业环境科学学报,2013,32(2):. |
| B[a]P累积污染对土壤呼吸强度的影响 |
| Influences of Benzo（a）pyrene Superimposed Pollution on Soil Respiration Intensity |
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| DOI：10.11654/jaes.2013.02.008 |
| 中文关键词: 苯并[a]芘（B[a]P） 累积污染 一次污染 有效性 土壤呼吸强度 |
| 英文关键词: benzo（a）pyrene（B[a]P） superimposed pollution one-time pollution bioavailability soil respiration intensity |
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| 摘要点击次数: 2197 |
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| 中文摘要: |
| 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（28~56 d）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。 |
| 英文摘要: |
| 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. |
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