| 滇池表层沉积物氮污染特征及其潜在矿化能力 |
| 摘要点击 2910 全文点击 1351 投稿时间：2014-08-31 修订日期：2014-10-03 |
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| 中文关键词 氮形态 空间分布 矿化能力 滇池 表层沉积物 |
| 英文关键词 nitrogen forms spatial distribution mineralization capacity Dianchi Lake surface sediment |
| 作者 | 单位 | E-mail | | 孟亚媛 | 云南民族大学化学与生物技术学院, 昆明 650500
中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
中国环境科学研究院国家环境保护湖泊污染控制重点实验室, 湖泊生态环境创新基地, 北京 100012
云南民族大学植物营养与新型肥料研究所, 昆明 650500 | 1916114770@qq.com | | 王圣瑞 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
中国环境科学研究院国家环境保护湖泊污染控制重点实验室, 湖泊生态环境创新基地, 北京 100012 | | | 焦立新 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
中国环境科学研究院国家环境保护湖泊污染控制重点实验室, 湖泊生态环境创新基地, 北京 100012 | | | 刘文斌 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
中国环境科学研究院国家环境保护湖泊污染控制重点实验室, 湖泊生态环境创新基地, 北京 100012 | | | 肖焱波 | 云南民族大学化学与生物技术学院, 昆明 650500
云南民族大学植物营养与新型肥料研究所, 昆明 650500 | 1814196178@qq.com | | 祖维美 | 云南民族大学化学与生物技术学院, 昆明 650500 | | | 徐天敏 | 云南民族大学化学与生物技术学院, 昆明 650500 | | | 丁帅 | 云南民族大学化学与生物技术学院, 昆明 650500 | | | 周童 | 云南民族大学化学与生物技术学院, 昆明 650500 | |
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| 中文摘要 |
| 利用滇池53个表层沉积物样品,研究了其不同形态氮含量及空间分布特征,探讨了滇池沉积物氮潜在矿化能力及其污染特征,以期揭示滇池沉积物氮污染影响因素及沉积物氮释放风险. 结果表明: ①滇池全湖表层沉积物总氮(TN)平均含量为3515.60 mg·kg-1,其中草海北部疏挖区、盘龙江入湖口及海口入湖区域含量较高,宝象河河口疏挖区域TN含量相对较低; 总有机氮(TON)含量较高,占TN的85.86%; 溶解态无机氮(DIN)含量较低,占TN的14.10%,TON与TN空间分布趋势一致,而DIN则不同; 与我国其他湖泊相比,滇池沉积物氮含量已经处于较高水平,其污染程度仅低于污染严重的城市湖泊; ②滇池全湖表层沉积物潜在可矿化氮(PMN)平均含量1154.76 mg·kg-1,占TN的32.90%,潜在释放风险较大; 其中草海湖区、外海北部盘龙江入湖口湖区、中部洛龙河和梁王河入湖口湖区及白鱼口湖区显著高于其它湖区; 目前滇池pH值有利于其沉积物氮矿化,有机质通过释放NH4+-N影响其沉积物氮矿化; 污染较重的水域,滇池上覆水氮浓度受其沉积物氮矿化影响较大,而污染较轻水域,则受影响较小. |
| 英文摘要 |
| The nitrogen content, its different forms and their spatial distribution were studied by using the 53 sediment samples from different sites in Dianchi Lake. Thereafter, the potential nitrogen mineralization ability of the sediments and their pollution characteristics were also explored to understand the influencing factors of nitrogen pollution and its release risk from the sediment surface to the overlying water of Dianchi. The results showed: ① the average total nitrogen content of surface sediment in Dianchi Lake was 3515.60 mg·kg-1, which was at a high level from the inlets in Caohai Northeast thinning digging area, Panlong River and the Haikou into Dianchi Lake, but relatively low in Baoxiang River Estuary dredging area. The total organic nitrogen (TON) content, accounting for 85.86% of TN, was at a high level; on the other hand, the dissolved inorganic nitrogen (DIN) content was lower, which accounted for 14.10% of TN. The spatial distribution of TON and TN kept the same trend, but not the DIN. Compared with other Lakes of China, the nitrogen content of sediment in Dianci was at a high level, and the extent of pollution was just below the serious polluted City Lakes. ② The average potential mineralizable nitrogen (PMN) content of Lake Dianchi was 1154.76 mg·kg-1, accounting for 32.90% of TN, which raised the potential risk of its release into the overlying water. Higher PMN was found in the Caohai Lake area and the inlet of Panlong River in the North, the inlet of Luolong Rive in the Middle Lake, the inlet of Baiyukou Lake and Liangwang River in the South. Nowadays, the pH value of Dianchi Lake was favorable for its sediment nitrogen mineralization, and its nitrogen mineralization was affected by the release of NH4+-N from organic matter. In the heavy polluted area, the concentration of the overlying water nitrogen was seriously affected by nitrogen mineralization of sediment from Dianchi, while the light polluted area was less affected. |
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