摘要
以茅尾海两个主要入海河口区表层沉积物为研究对象,采用改进后的连续提取法(SEDEX)对15个采样点沉积物中磷的组分、含量、分布及其影响因素进行研究,探讨了磷的生物有效性。结果表明,无机磷(IP)是茅岭江和钦江入海河口区表层沉积物中总磷(TP)的主要存在形式,平均分别占TP的64.4%和65.9%,有机磷(OP)均占较小的比例。IP均以铁结合态磷(Fe-P)为主要赋存形态,平均分别占TP的31.2%和28.1%,原生碎屑磷(De-P)、自生磷灰石磷(Ca-P)和可交换态磷(Ex-P)平均占TP比例依次递减。河流输入、沉积物粒度和沉积环境是影响茅尾海入海河口区表层沉积物中不同形态磷含量及分布的主要因素。磷生物有效性分析表明,茅岭江、钦江入海河口区表层沉积物中生物可利用磷(BAP)含量分别为2.95~22.52μmol/g和2.67~13.83μmol/g,平均占TP的73.9%和68.8%,呈现较强的释磷潜力。
Surface sediments from fifteen stations were sampled along the Maolingjiang river estuary(MRE)and Qinjiang river estuary(QRE) areas in the Maowei sea, and analyzed using an improved sequential extraction(SEDEX) method to evaluate the abundance, distribution and potential bioavailable forms of P.Results showed that inorganic P(IP) was the dominant P form, which averagely accounted for 64.4% and65.9% of total P(TP) pool in surface sediments along the MRE and QRE areas, respectively. Ferric(Fe) bound P(Fe-P) was the dominant IP specie, accounting for 31.2% and 28.1% of sedimentary TP pool, respectively along the MRE and QRE areas. The proportions of other IP species such as the detrital apatite P(De-P),authigenic P(Ca-P) and exchangeable P(Ex-P) were relatively low in surface sediments. Riverine inputs,sediment grain size and sedimentary environment played influential roles on the concentration and distribution of different P forms in the study area. The concentrations of potential bioavailable P(BAP) were 2.95~22.52μmol/g and 2.67~13.83 μmol/g, respectively, and averagely accounted for 73.9% and 68.8% of TP pool in surface sediments along the MRE and QRE areas, respectively. Thus, surface sediments deposited along the estuarine areas in the Maowei sea show a higher potential for P release into the overlying water.
作者
徐程
杨斌
莫小荣
宁志铭
黄海方
XU Cheng;YANG Bin;MO Xiao-rong;NING Zhi-ming;HUANG Hai-fang(Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf,Beibu Gulf University,Qinzhou 535011,China;College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541000,China;College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;Guangxi Laboratory on the Study of Coral Reefs in the South China Sea,Guangxi University,Nanning 530004,China)
出处
《海洋环境科学》
CAS
CSCD
北大核心
2021年第2期250-257,共8页
Marine Environmental Science
基金
国家自然科学基金项目(41706083)
广西自然科学基金项目(2017GXNSFBA198135,2018GXNSFDA281025)
广西“海洋生态环境”院士工作站能力建设项目(桂科AD17129046)。
关键词
磷形态
生物有效性
表层沉积物
河口区
茅尾海
phosphorus forms
bioavailability
surface sediments
estuary areas
Maowei sea
作者简介
徐程(1995-),男,安徽芜湖人,硕士研究生,研究方向为海洋生物地球化学,E-mail:xerxes471@163.com;通讯作者:杨斌(1983-),男,安徽合肥人,副教授,博士,硕导,研究方向为海洋生物地球化学,E-mail:binyang@bbgu.edu.cn。
