不同磷形态提取方法在南四湖沉积物中的应用比较研究

Comparative Study on the Application of Different Phosphorus Extraction Methods in Sediments of Nan Si Lake

摘要: 磷是水体富营养化的关键限制性因子之一，其在水体–沉积物系统中的迁移转化与环境行为备受关注。本文以南四湖7个点位(D1, D2, D3, N1, N2, N3, N4)沉积物为研究对象，采用Hieltjes-Lijklema法(H-L法)、Rydin法、Psenner法和SMT法四种常用磷形态提取方法，对沉积物中不同形态磷进行系统提取与对比分析。结果表明，不同提取方法在磷形态分类、提取效率及形态分配上存在显著差异，其中H-L法提取的总磷含量最高，SMT法提取的在Fe/Al-P和Ca-P与其它方法相比具有较好的可比性。Rydin法和Psenner法在Fe/Al-P的提取中表现出较高灵敏度，适用于研究Fe/Al-P的环境行为。本文通过对比分析不同方法的提取结果，揭示了各方法在磷形态识别中的优势与局限性，为南四湖沉积物磷形态的环境风险评估与治理提供科学依据。

Abstract: Phosphorus is one of the key limiting factors for eutrophication in water bodies, and its migration, transformation and environmental behavior in the water-sediment system have attracted much attention. This paper takes the sediments from seven sites (D1, D2, D3, N1, N2, N3, and N4) in the South Four Lakes as the research object and uses four commonly used phosphorus fractionation methods, namely the Hieltjes-Lijklema method (H-L method), Rydin method, Psenner method and SMT method, to systematically extract and comparatively analyze different forms of phosphorus in the sediments. The results show that there are significant differences among the four methods in terms of phosphorus fraction classification, extraction efficiency and fraction distribution. Among them, the H-L method has the highest total phosphorus content, and the Fe/Al-P and Ca-P extracted by the SMT method have better comparability with those extracted by other methods. The Rydin method and Psenner method show high sensitivity in the extraction of Fe/Al-P and are suitable for studying the environmental behavior of iron and aluminum-bound phosphorus. Through the comparative analysis of the extraction results of different methods, this paper reveals the advantages and limitations of each method in phosphorus fraction identification, providing a scientific basis for the environmental risk assessment and management of phosphorus fractions in the sediments of the South Four Lakes.