| 滇池沉积物有机磷垂直分布特征及其生物有效性 |
| 摘要点击 2688 全文点击 1382 投稿时间：2014-04-16 修订日期：2014-05-29 |
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| 中文关键词 滇池 沉积物 有机磷 垂直分布 EHP 生物有效性 |
| 英文关键词 Dianchi Lake sediments organic phosphorus vertical distribution EHP bioavailability |
| 作者 | 单位 | E-mail | | 熊强 | 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湖泊生态环境创新基地, 国家环境保护湖泊污染控制重点实验室, 北京 100012
南昌大学环境与化学工程学院, 南昌 330031 | 1454021934@qq.com | | 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湖泊生态环境创新基地, 国家环境保护湖泊污染控制重点实验室, 北京 100012 | | | 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湖泊生态环境创新基地, 国家环境保护湖泊污染控制重点实验室, 北京 100012 | wangsr@craes.org.cn | | 彭希珑 | 南昌大学环境与化学工程学院, 南昌 330031 | |
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| 中文摘要 |
| 选取了滇池4个代表性柱状沉积物样品，研究了其不同形态有机磷含量及垂直分布，并利用酶水解技术表征了其不同形态有机磷生物有效性.结果表明：①除水提取磷（H2O-Po）外，滇池沉积物可提取磷以无机磷为主，其各形态有机磷含量大小为NaOH提取有机磷（NaOH-Po） >NaHCO3提取有机磷（NaHCO3-Po） >H2O-Po >HCl 提取有机磷（HCl-Po），其中H2O-Po、NaHCO3-Po与NaOH-Po迁移性较高，其含量垂直分布呈现表层>中层>底层趋势.②滇池沉积物酶可水解磷（EHP）以活性单酯磷为主，其H2O-Po、NaHCO3-Po与NaOH-Po酶可水解磷含量分别在0.11~5.93、0~45.32与0~107.11mg·kg-1；各形态有机磷EHP含量大小为NaOH-Po >NaHCO3-Po >H2O-Po，且呈现表层 >中层 >底层趋势；不同深度沉积物有机磷生物有效性大小为表层 >中层 >底层.③EHP是滇池沉积物生物有效性磷的重要来源，滇池水质保护应考虑沉积物EHP对其水质的影响.当外部磷负荷逐步得到控制后，沉积物EHP生物地球化学循环对维持滇池富营养化具有重要作用. |
| 英文摘要 |
| The content and vertical distribution characteristics of organic phosphorus were studied by collecting core sediments of Dianchi Lake, characterizing the bioavailability of different organic phosphorus species of these sediments by enzymatic hydrolysis. The results indicated that, ①The inorganic phosphorus represented primary portions of extractable phosphorus of sediments in Dianchi Lake, except for the H2O extractable organic phosphorus (H2O-Po). The rank of order of organic phosphorus fractionation in sediments was NaOH extractable organic phosphorus(NaOH-Po) >NaHCO3 extractable organic phosphorus(NaHCO3-Po) >H2O-Po >HCl extractable organic phosphorus(HCl-Po). The vertical distribution of NaOH-Po, NaHCO3-Po and H2O-Po with relatively high mobility showed the trend of topper layer>middle layer>bottom layer. ② Labile monoester P predominated in enzymatically hydrolysable phosphorus (EHP) of sediments in Dianchi Lake. The EHP content of NaOH-Po, NaHCO3-Po and H2O-Po in sediments of Dianchi Lake were 0.11-5.93, 0-45.32 and 0-107.11 mg·kg-1, respectively. The EHP content of different organic phosphorus species followed the order: NaOH-Po >NaHCO3-Po >H2O-Po, with the trend of vertical distribution of topper layer >middle layer >bottom layer. The bioavailability of organic phosphorus of different depth showed the order of topper layer >middle layer>bottom layer. ③EHP was a considerable source of the bioavailable phosphorus of sediments in Dianchi Lake. The protection of water quality in Dianchi Lake should consider the effects of EHP in sediments. When the external phosphorus load was restricted gradually, the biogeochemical cycle of EHP in sediments might play an important role in maintaining the eutrophication of Dianchi Lake. |
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