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湖泊沉积物有机磷释放动力学特征及水质风险
摘要点击 563  全文点击 117  投稿时间:2021-10-15  修订日期:2021-11-01
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中文关键词  沉积物  有机磷  释放动力学  磷形态  水质风险
英文关键词  sediment  organic phosphorus  release kinetics  phosphorous forms  water quality risks
作者单位E-mail
刘哲哲 首都师范大学资源环境与旅游学院, 北京 100084
北京师范大学珠海校区水科学研究中心, 粤港水安全保障联合实验室, 珠海 519087
北京师范大学水科学研究院, 北京 100875 
924850809@qq.com 
倪兆奎 北京师范大学珠海校区水科学研究中心, 粤港水安全保障联合实验室, 珠海 519087
北京师范大学水科学研究院, 北京 100875 
 
刘思儒 广州市环境保护科学研究院, 广州 510620  
李晓秀 首都师范大学资源环境与旅游学院, 北京 100084 lxiaoxiu0548@sina.com 
王圣瑞 北京师范大学珠海校区水科学研究中心, 粤港水安全保障联合实验室, 珠海 519087
北京师范大学水科学研究院, 北京 100875
云南省高原湖泊流域污染过程与管理重点实验室, 昆明 650034 
wangsr@bnu.edu.cn 
中文摘要
      为揭示湖泊沉积物有机磷释放特征及对水质影响,选取我国云南高原及长江中下游6个湖泊沉积物,研究了溶解态有机磷(DOP)和溶解态无机磷(SRP)释放动力学差异及有机磷形态与溶解性有机质(DOM)特征对沉积物磷释放影响,并探讨了沉积物DOP释放的水质风险.结果表明:①沉积物DOP和SRP释放动力学过程相似,均遵循二级动力学模型,首先是快速释放阶段,随后慢速释放,释放曲线逐渐平缓并达到最大释放量.②沉积物有机磷释放与有机磷形态和有机质有关.活性有机磷(LOP)和中活性有机磷(MLOP)是快速释放阶段主要向上覆水释放的DOP形态.释放后期LOP和MLOP占总有机磷(DTP)比例下降,而非活性有机磷(NLOP)比例增加;同时DOM腐殖化程度和芳香性随磷释放过程逐渐升高,DOM活性不断降低,导致DOP释放速率呈先快后慢趋势.③与SRP相比,DOP释放量较大,占DTP总释放量的47%~77%,释放风险较高;湖泊营养水平较高,沉积物DOP释放量较大,水质下降风险也较高.因此,湖泊沉积物磷释放不仅应关注无机磷释放,也应关注有机磷释放,否则会低估沉积物磷释放量及水质风险.
英文摘要
      To reveal the characteristics of organic phosphorus release from lake sediments and its potential impact on water quality, six lake sediments from Yunnan Plateau and the middle and lower reaches of the Yangtze River in China were selected. We studied the differences in the kinetics of dissolved organic phosphorus (DOP) and dissolved inorganic phosphorus (SRP) release from sediments. The effects of organic phosphorus morphology and dissolved organic matter (DOM) characteristics on sediment phosphorus release were investigated, and the water quality risks of sediment DOP release were discussed. The results showed that:① the release kinetics of sediment DOP and SRP were similar; both followed the second-order kinetic model, starting with a rapid release phase, followed by a slow release, and the release curve gradually leveled off and reached the maximum release. ② The release of organic phosphorus was related to organophosphorus morphology and organic matter. Active organic phosphorus (LOP) and medium active organic phosphorus (MLOP) were the DOP forms mainly released into the overlying water during the rapid release phase. The proportion of LOP and MLOP to total organic phosphorus (DTP) decreased in the late release stage, whereas the proportion of non-active organic phosphorus (NLOP) increased; further, the degree of humification and aromaticity of organic matter gradually increased with phosphorus release, and its activity decreased, resulting in a slower release rate at the later stage. ③ Compared with that of SRP, the risk of DOP release was higher, accounting for 47%-77% of the total amount of DTP. It was also found that the higher the nutrient level of the lake, the greater the release of DOP and the higher the water quality risk. Therefore, not only the release of inorganic phosphorus but also that of organic phosphorus should be of concern in the process of phosphorus release from lake sediments to prevent the underestimation of phosphorus release and water quality risk.

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