Phosphorus Speciation in Wetland Sediments of Zhujiang (Pearl) River Estuary,China

编号 zgly0001581071

文献类型 期刊论文

文献题名 Phosphorus Speciation in Wetland Sediments of Zhujiang (Pearl) River Estuary,China

作者 WANGLili  YEMei  LIQusheng  ZOUHang  ZHOUYongsheng 

作者单位 DepartmentofEnvironmentalEngineering  JinanUniversity  KeyLaboratoryofWater/SoilToxicPollutantsControlandBioremediation  DepartmentofEducationofGuangdongProvince 

母体文献 Chinese Geographical Science 

年卷期 2013年05期

年份 2013 

分类号 X703 

关键词 estuarywetland  phosphorus  fraction  adsorption-desorption 

文摘内容 Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang(Pearl) River estuary wetland were investigated.Results showed that the total phosphorus(TP) content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg;inorganic phosphorus(IP) was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg.Among the inorganic phosphorus,the main fractions were phosphorus bound to Al and Fe(Fe/Al-P),and calcium-bound phosphorus(Ca-P),accounting for 23%–42% and 21%–67% of IP,respectively.The vertical distribution of TP contents were significantly positive correlated with organic phosphorus(Org-P) and Fe/Al-P contents.The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg,mainly existed in Fe-Al/P fraction,and increased from the bottom to top sediments.The transport of phosphorus in sediment-water interface was controlled by the soil characteristics.The active Fe and Al content was considered as the main factor that determines adsorption capacity in vegetated marsh wetland.The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland.The potential risk of eutrophication in the study area is high.Reducing terrestrial phosphorus discharge and preventing the sediment Fe/Al-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands,and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment.