新丰江水库沉积物磷赋存形态及分布特征  

Phosphorus Speciation and Distribution in the Sediments of Xinfeng River Reservoir

作　　者：陈瑞 周雯 乔永民[1] 李磊 罗梦霞 CHEN Rui;ZHOU Wen;QIAO Yongmin;LI Lei;LUO Mengxia(Institute of Hydrobiology,Jinan University,Guangzhou 510632,P.R.China;South China Institute of Environmental Science,MEE,Guangzhou 510655,P.R.China)

机构地区：[1]暨南大学水生生物研究所,广东广州510632 [2]生态环境部华南环境科学研究所,广东广州510655

出　　处：《水生态学杂志》2025年第1期133-142,共10页Journal of Hydroecology

基　　金：国家重大科技专项(2013ZX07105-005-02)。

摘　　要：对新丰江水库表层沉积物磷的总量及其形态学进行分析,探讨沉积物不同形态磷之间的内在联系,揭示来源及其与水环境之间的响应关系,为水库的科学管理提供理论依据和数据支撑。2021年1月采集了新丰江水库12个样点的表层沉积物,分析总磷(TP)及各形态的含量与分布特征。结果表明:新丰江水库表层沉积物中TP的平均含量为(707.0±265)mg/kg,其中无机磷(IP)为主要存在形式,平均含量为(504.9±223.6)mg/kg,各形态磷含量及占IP比例顺序为自生钙结合态磷(Ca-P)(<239.9±113.3>mg/kg,47.1%)>碎屑磷(De-P)(<143.2±57.7>mg/kg,28.9%)>可交换态磷(Ads-P)(<61.6±16.1>mg/kg,13.5%)>铁结合态磷(Fe-P)(<60.2±43.5>mg/kg,10.5%);有机磷(OP)的含量为122.6~284.2 mg/kg,平均含量(203.5±50.4)mg/kg,占TP的30.4%;生物有效磷(BAP)的含量为139.5~379.5 mg/kg,平均含量(243.9±83.1)mg/kg,占TP的36.2%。从空间分布上看,TP含量从上游到下游呈显著下降趋势。各形态磷中,OP、Fe-P、De-P与TP的分布趋势相似,反映该水库沉积物磷以外源输入为主。相关分析表明,沉积物TP和各形态磷之间存在较强相关性,其来源具有一定相似性;BAP与Fe-P相关性最高,Fe-P可能是沉积物BAP最主要的来源;Ca-P、TOM均与OP之间存在显著正相关,均以外源输入为主,其次受内源生物影响,存在一定释放风险。加强对水库沉积物内源磷释放机制和控制措施的研究,对于科学管理水源水库至关重要。Xinfeng River reservoir is one of the largest oligotrophic water bodies in South China and the largest deep-water reservoir in Guangdong Province and it serves as an important drinking water source for the Pearl River Delta.In this study,we investigated the total phosphorus(TP)content and phosphorus speciation in the surface sediment of Xinfeng River reservoir.Further,we explored the relationships among the different forms of phosphorus,and revealed their sources and response to the aquatic environ-ment.Our aim was to provide a theoretical basis and data support for scientific management of the reservoir.In January 2021,sediment and water samples were collected at 12 sampling sites in the reser-voir for determination of total phosphorus,the content of different phosphorus forms,and water physio-chemical properties.Results show that the content of TP in the surface sediment of Xinfeng River reser-voir was in the range of 346.3-1243.8 mg/kg,with an average value of(707.0±265)mg/kg.Inorganic phosphorus(IP)was the primary form of sediment TP,with an average content of(504.9±223.6)mg/kg,and the contents and proportions of different IP forms were in the following order:autogenous calcium-bound phosphorus(Ca-P)(239.9±113.3 mg/kg,47.1%)>detrital phosphorus(De-P)(143.2±57.7 mg/kg,28.9%)>exchangeable phosphorus(Ads-P)(61.6±16.1 mg/kg,13.5%)>Fe-bound phosphorus(Fe-P)(60.2±43.5 mg/kg,10.5%).The content of organic phosphorus(OP)ranged from 122.6 to 284.2 mg/kg,and the average content was(203.5±50.4)mg/kg,accounting for 30.4%of TP.The content of bioavailable phosphorus(BAP)ranged from 139.5 to 379.5 mg/kg,and the average content was(243.9±83.1)mg/kg,accounting for 36.2%of TP.Spatially,TP content decreased significantly from upstream to downstream,and the distribution of OP,Fe-P,De-P and TP was similar,reflecting that exogenous input of phosphorus was the primary source of TP in reservoir sediment.Correlation analysis shows that there was a strong re-lation between sediment TP and the different forms of phosphorus,and t

关 键 词：水库 沉积物 磷形态 新丰江 

分 类 号：X171.1[环境科学与工程—环境科学]