派河清水廊道表层沉积物中磷的赋存形态特征及其环境指示意义  

CHARACTERISTICS OF PHOSPHORUS FRACTIONS IN SURFACE SEDIMENT FROM A CLEAR WATER GALLERY IN PAIHE RIVER, AND ITS ENVIRONMENTAL IMPLICATIONS

作　　者：陈莹莹 张浏[2] 尹浩[3] 王育来 CHEN Ying-ying;ZHANG Liu;YIN Hao;WANG Yu-lai(School of Energy and Environment,Anhui University of Technology,Maanshan 243002,China;Anhui Research Academy for Environmental Science,Hefei 230071,China;CAS Key Laboratory of Crust-Mantle Materials and the Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]安徽工业大学能源与环境学院,安徽马鞍山243002 [2]安徽省环境科学研究院,合肥230071 [3]中国科学技术大学地球与空间科学学院壳幔物质与环境实验室,合肥230026

出　　处：《环境工程》2021年第12期71-78,共8页Environmental Engineering

基　　金：国家科技重大专项(2017ZX07603-004)。

摘　　要：沉积物磷的赋存形态是河流内源释放的关键控制因素之一。以"引江济淮—江淮沟通"段清水廊道——派河为研究对象,分别测定了派河表层沉积物中总磷、无机磷和有机磷含量,并采用分级提取法分析了有机磷赋存形态,包括活性有机磷(labile organic phosphorus, LOP)、中活性有机磷(moderately labile organic phosphorus, MLOP)和非活性有机磷(nonlabile organic phosphorus, NOP),进一步探讨了不同磷形态的空间分布特征。结果表明:派河表层沉积物中总磷含量为471.17~1509.58 mg/kg,无机磷含量为421.83~1325.17 mg/kg,有机磷含量为103.29~221.79 mg/kg;派河沉积物各形态有机磷含量大小顺序总体上为NOP>LOP>MLOP,其中MLOP和NOP含量均表现为下游河段含量显著高于中上游河段(P<0.05)。同时,有机磷的赋存形态与沉积物的理化性质相关,NOP与阳离子交换量呈显著正相关(P<0.05);MLOP和NOP均与LOI(loss on ignition)呈显著正相关(P<0.05),表明沉积物中有机质含量和CEC可能会影响沉积物中有机磷的赋存形态。研究结果表明,"江淮沟通"工程的实施可能引起沉积物中磷的内源释放,建议工程实施后应在削减外源输入和内源控制的基础上加强流域生态监测,实施流域智慧管理等措施。The fractions distribution of sediment phosphorus is one of the important controlling factors of river endogenous release. In present study, the total phosphorus, inorganic phosphorus and organic phosphorus contents in surface sediments of Paihe River section, the clear water gallery of Yangtze-Huaihe Water Diversion, were determined. The organic phosphorus fractions were explored by the method of graded extraction, including labile organic phosphorus(LOP), moderately labile organic phosphorus(MLOP) and nonlabile organic phosphorus(NOP). And the spatial distribution characteristics of phosphorus fractions were further discussed. The results showed that the total phosphorus content in the surface sediments of Paihe River was 471.17~1509.58 mg/kg, among which the inorganic phosphorus content was 421.83~1325.17 mg/kg, and the organic phosphorus content was 103.29~221.79 mg/kg. Generally, the contents of organic phosphorus fractions followed the order of NOP>LOP>MLOP, and the content of MLOP and NOP were significantly higher in the downstream reach than in the middle and upper reach(P<0.05). The organic phosphorus fractions was related to the physical and chemical properties of sediments. NOP had significant positive correlation with cation exchange capacity(CEC)(P<0.05), MLOP and NOP had significant positive correlation with loss on ignition(LOI)(P<0.05), indicating that the variation of organic matter and CEC in sediments affected the distribution of organic phosphorus fractions. The results of this study indicated that the implementation of the Yangtze-Huaihe Water Diversion project may lead to the endogenous release of phosphorus in sediments. Therefore, after the project implemented, on the basis of reducing exogenous input and endogenous control, ecological monitoring should be strengthened and watershed intelligent management should be conducted.

关 键 词：清水廊道 有机磷形态 引江济淮 内源释放 

分 类 号：X522[环境科学与工程—环境工程]