| 摘要: |
| 湖泊沉积物中磷的形态是影响其在水生态系统中迁移转化的关键内因。本研究采集了呼伦湖36个样点的表层与柱芯沉积物样品，系统分析了沉积物中磷的形态特征与粒度、pH、有机碳及同步提取铁铝钙锰等元素的关联关系。结果表明，呼伦湖沉积物总磷（TP）呈西北向东南递减趋势；沉积物中磷与同步提取的铝（Al）、钙（Ca）、铁（Fe）和锰（Mn）等金属元素呈显著正相关关系，与磷在这些金属氧化物或氢氧化物表面的吸附和共沉淀有关；同时，磷与平均粒径和pH值显著负相关，平均粒径与铁磷（Fe-P）和铝磷（Al-P）的显著负相关主要与铁铝矿物有在细颗粒物中富集趋势且细颗料物比表面积大能提供更多吸附点位有关；Fe-P、Al-P和钙磷（Ca-P）对pH的变化响应较为敏感。路径分析表明，有机质、吸附、氧化还原、微生物及沉积物粒径等均是磷的含量及其形态特征的重要影响因子，总有机碳（TOC）是呼伦湖沉积物中磷形态分布的首要影响因子；沉积物粒径虽然对沉积物磷含量的直接影响较小，但可通过影响TOC含量对磷产生间接影响。本研究积累了我国北方湖泊沉积物中磷的迁移转化的基础数据，为从全国尺度上理解不同湖区沉积物中磷的地球化学特征对流域自然和人为过程的响应机制提供新的视角。 |
| 关键词: 磷，形态特征，沉积物，理化性质，影响机制 |
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| Effects of sediments properties on phosphorus fractionation in Lake Hulun |
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Li, Liang,Jiang, Xinyue,Huang, Yajia,Luo, Zhiqi,Xie, Fei,Zhou, Xinjun,Lü, Changwei
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Inner Mongolia University
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| Abstract: |
| The form of phosphorus in lake sediments is a key internal factor affecting its migration and transformation in aquatic ecosystems. This study collected surface and core sediment samples from 36 sites in Hulun Lake and systematically analyzed the distribution characteristics of phosphorus forms in the sediments and their correlations with particle size, pH, organic carbon, and simultaneously extracted iron, aluminum, calcium, and manganese. Significant positive correlations between P(Phosphorus.) contents and Al (Aluminum), Ca (Calcium), Fe (Iron) and Mn (Manganese) highlighted the potential effects of metallic oxides on surface adsorption and co-precipitation. Simultaneously, contributed by the larger specific surface area property, P and both mean grain size and pH exhibited in significant negative correlations. Additionally, our results also highlighted the stability of Fe-P (Iron-bound Phosphorus), Al-P (Aluminum-bound Phosphorus) and Ca-P (Calcium-bound Phosphorus) were strongly associated with pH. TOC (Total Organic Carbon) contributed most significantly in P distributions, followed by grain size. This study provides fundamental data on the migration and transformation of phosphorus in northern lake sediments in China, offering new perspectives on understanding the geochemical characteristics of phosphorus in different lake areas and their responses to natural and anthropogenic processes at a national scale. |
| Key words: Phosphorus, fraction characteristics, sediments, physicochemical property, influencing mechanism |
