不同温度对沉积物理化性质及磷形态赋存特征的影响研究

A Study on the Effects of Different Temperatures on the Physicochemical Properties and Phosphorus Speciation Characteristics of Sediments

摘要: 温度是调控沉积物磷释放的关键环境因子。为了探究不同温度下沉积物磷释放特性，对不同温度条件下，三垟湿地沉积物中磷形态含量特征及理化性质进行了研究。通过室内模拟实验，测定了在10℃、25℃、30℃培养条件下，沉积物在不同时间的磷形态含量特征及理化性质。结果表明，不同温度下底泥中磷的赋存形态存在较大差异，并且其磷的释放具有极强的温度依赖性：在25℃下，磷释放主要经由铁结合磷的还原溶解路径主导；在30℃下，高温同时激活多个释磷路径，其中有机磷的转化成为最主要的释磷来源，同时伴随着铁、铝结合磷的复杂动态变化。本研究系统揭示了温度对三垟湿地沉积物磷形态赋存特征的影响，对于深入理解湿地内源磷释放机制、预测富营养化风险及制定针对性生态修复策略等具有重要意义。

Abstract: Temperature is a key environmental factor controlling phosphorus release from sediments. To investigate the characteristics of phosphorus release from sediments at different temperatures, the phosphorus speciation and physicochemical properties of sediments from Sanyang Wetland were studied under varying temperature conditions. The phosphorus speciation characteristics and physicochemical properties of sediments in the Sanyang Wetland were investigated under different temperature conditions. Through laboratory simulation experiments, phosphorus speciation characteristics and physicochemical properties of sediments in culture columns were measured at different time points under incubator temperatures of 10˚C, 25˚C, and 30˚C. Results indicate significant form-specificity and temperature dependence in phosphorus release: at 25˚C, phosphorus release primarily occurs via the reduction-dissolution pathway of iron-bound phosphorus; at 30˚C, elevated temperatures simultaneously activate multiple release pathways, with the transformation of organic phosphorus becoming the predominant release source, accompanied by complex dynamic changes in iron-and aluminum-bound phosphorus. This study systematically reveals the influence of temperature on the characteristics of phosphorus speciation in the sediments of the Sanyang Wetland, which is of great significance for a deeper understanding of the mechanisms of internal phosphorus release in wetlands, predicting eutrophication risks, and formulating targeted ecological restoration strategies.