| 太湖湖泛易发区沉积物中有机磷形态分布特征 |
| 摘要点击 2373 全文点击 889 投稿时间：2016-03-07 修订日期：2016-06-02 |
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| 中文关键词 太湖 湖泛 沉积物 有机磷 形态 分布 |
| 英文关键词 Lake Taihu black water aggregation (BWA) sediment organic phosphorus form distribution |
| 作者 | 单位 | E-mail | | 董丹萍 | 南京师范大学地理科学学院, 南京 210023 | 1187322915@qq.com | | 章婷曦 | 南京师范大学地理科学学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 南京 210023
江苏省物质循环与污染控制实验室, 南京 210023 | zhangtingxi@njnu.edu.cn | | 张丁予 | 南京师范大学地理科学学院, 南京 210023 | | | 王巧云 | 南京师范大学地理科学学院, 南京 210023 | | | 李德芳 | 南京师范大学地理科学学院, 南京 210023 | | | 王国祥 | 南京师范大学地理科学学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 南京 210023
江苏省物质循环与污染控制实验室, 南京 210023 | |
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| 中文摘要 |
| 湖泊沉积物中磷的潜在释放很大程度上取决于有机磷的形态和分布.以太湖西岸湖泛易发区毛渎港（MDG）为研究区域，采用Ivannoff有机磷分级提取方法对沉积物中有机磷进行分析.结果表明，不同采样点沉积物中有机磷形态以胡敏酸结合态OP为主，占有机磷总量的35%.总有机磷含量由岸边往湖心先降低后增加；垂直方向2~6 cm含量最低，4~8 cm含量最高.沉积物中各形态磷含量大小：胡敏酸结合态OP > 残渣态OP > HCl-OP > 富里酸结合态OP；由岸边向湖心区延伸，NaHCO3-OP占总有机磷的相对含量呈先升高后降低再升高的趋势，蓝藻残体的沉积增加了沉积物中NaHCO3-OP含量.NaHCO3-OP和胡敏酸结合态OP垂直分布大致先降低后升高再降低，NaHCO3-OP在4~6 cm含量最低，胡敏酸结合态OP在4~8 cm含量最高.HCl-OP和富里酸结合态OP垂直分布大致随深度增加含量降低.残渣态OP含量垂直方向无明显变化，均稳定在45 μg·g-1左右.活性有机磷与pH、DO、水深呈显著负相关；OM、NaOH-Pi均与总有机磷、活性有机磷、中等活性有机磷及非活性有机磷表现出了显著相关关系.有机磷3种组分均具有生物活性，对湖泊富营养化有着重要作用，蓝藻堆积区活性有机磷的增加可能促进湖泛的发生. |
| 英文摘要 |
| Potential release of phosphorus in lake sediments depends largely on the fractions and distribution of organic phosphorus. MaoDu was chosen as the research area in the west of Lake Taihu. The chemical forms of the surface sediments were investigated by the Ivannoff extraction methods. The results showed that the main organic phosphorus form of sediments at different sampling places was humic acid-OP. It accounted for 35% of the total organic phosphorus. Horizontal distribution: Total organic phosphorus content from the shore to the middle of total showed a trend of rising after decline; vertical distribution: Total organic phosphorus content was the lowest in 2-6 cm and the highest in 4-8 cm. Various phosphorus content followed the order of humic acid-OP > residual-OP > HCl-OP > fulvic acid-OP; the relative content of NaHCO3-OP in the total organic phosphorus content showed a trend of rising followed by reduction and then rising again from the shore to the middle, cyanobacteria residue deposition increased the content of NaHCO3-OP in sediment. Contents of NaHCO3-OP and humic acid-OP both first reduced, then increased and finally reduced in the vertical distribution, the content of NaHCO3-OP was the lowest in 4-6 cm and humic acid-OP was the highest in 4-8 cm. HCl-OP and fulvic-OP decreased with increasing depth in the vertical distribution. The content of residual-OP showed stable tendency in the vertical direction and was about 45 μg·g-1. Labile OP and pH, DO, the depth of water were significantly negatively correlated, OM and NaOH-Pi were significantly correlated with total organic phosphorus, labile OP, moderately labile OP and nonlabile OP. Three components of organic phosphorus had bio-availability and played an important role in lake eutrophication. The increase of the content of labile OP might promote the black water aggregation (BWA) in cyanobacteria accumulation. |
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