| 镇江老城区古运河沉积物氮及有机质垂向分布及污染评价 |
| 摘要点击 1663 全文点击 1039 投稿时间：2013-09-03 修订日期：2014-01-13 |
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| 中文关键词 沉积物 氮 有机质 古运河 评价 |
| 英文关键词 sediments nitrogen organic matter ancient canal evaluation |
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| 中文摘要 |
| 为揭示镇江老城区古运河沉积物中氮及有机质的垂向分布特征及污染状况，分别采集古运河老城区上游电力路桥（D）和下游南水桥（B）两个沉积物柱状样，分析其总氮（TN）、有机氮（Org-N）、氨氮（NH4+-N）、硝氮（NO3--N）及有机质（O.M）含量、C/N比的垂向分布特征，并通过富集系数及污染物的综合评价，揭示古运河沉积物中污染物的演化规律和污染状况. 结果表明：①D点TN、Org-N、NH4+-N、NO3--N以及O.M的平均值分别为366.33 mg·kg-1、348.02 mg·kg-1、89.47 mg·kg-1、13.51 mg·kg-1、0.43%，B点则分别为940.23 mg·kg-1、893.22 mg·kg-1、169.48 mg·kg-1、15.19 mg·kg-1、0.76%，以上指标均表现为DP>0.05），表明以上两个采样点沉积物对营养元素的富集过程相似；④D和B两点沉积物TN与O.M均无显著性相关，判断以上两点沉积物TN可能主要来自于外源污染；⑤有机指数评价结果显示，D和B两点有机污染呈现出清洁状态，有机氮则在较清洁、尚清洁范围. |
| 英文摘要 |
| In order to reveal vertical distribution characteristics of nitrogen and organic matter in the ancient canal sediments of Zhenjiang old town, the columnar sediment samples in Dianli road bridge (D) and Nanshui bridge (B) were collected, contents of total nitrogen (TN), organic nitrogen (Org-N), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N) and organic matter (O.M) were determined, and C/N, nutrient concentration coefficient and the correlation of nitrogen, O.M and environmental factors had been analyzed, and organic nitrogen and organic index had also been evaluated. The results showed that ① The average contents of TN, Org-N, NH4+-N, NO3--N and O.M were 366.33 mg·kg-1, 348.02 mg·kg-1, 89.47 mg·kg-1, 13.51 mg·kg-1, 0.43%, respectively, in Dianli road bridge (D). And the average contents of TN, Org-N, NH4+-N, NO3--N and O.M were 940.23 mg·kg-1, 893.22 mg·kg-1, 169.48 mg·kg-1, 15.19 mg·kg-1, 0.76%, respectively, in Nanshui bridge (B). The ranked order of average N and O.M was DP>0.05) of nutrient concentration coefficient between D and B sampling points, which indicated that the concentration process of nitrogen and organic matter was similar in D and B sampling points. ④ TN and O.M were not significantly correlated, which indicated that TN might come from exogenous pollution. ⑤ The organic index evaluation results showed that ancient canal sediments of Zhenjiang old town were in a cleaning situation, and organic nitrogen still belonged to fairly cleaning and slight cleaning categories. |
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