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1、中国环境科学2012,32(4)：666~673ChinaEnvironmentalScience外源硫酸盐对武汉南湖表层沉积物磷形态的作用1,21*111袁探,华玉妹,朱端卫,丁敏,蔡建波(1.华中农业大学资源与环境学院,湖北武汉430070；2.德州市环境保护监测中心站,山东德州253034)摘要：采用室内模拟实验,选取武汉市南湖表层沉积物及相应上覆水,研究了硫酸盐的输入对沉积物磷形态的影响.结果表明,硫酸盐输入水体后提高了沉积物磷的迁移活性,导致上覆水中总磷(TP)、溶解性正磷酸盐(SRP)含量升高,上升幅度随硫酸盐输入量的增加而增加.硫酸盐扩散到沉积物后,先是生成酸
2、可挥发性硫(AVS),进而转变成铬还原硫.硫酸盐输入提高了沉积物pH值,而使Eh降低.沉积物不同磷形态对外源硫酸盐的响应有所差异,二钙磷(Ca2-P)含量随输入硫酸盐浓度的增加而增加,含量最高的铁磷(Fe-P)为800mg/kg左右,占总磷的51.4%~56.6%,受硫酸盐的影响极显著(P<0.01),在沉积物中含量降低而向上覆水中释放.上覆水中溶解性铁和TP、SRP均呈显著正相关.硫酸盐对沉积物中闭蓄态铁磷(O-Fe-P)也产生显著影响(P<0.05),总体而言是促进其释放.关键词：沉积物；硫酸盐还原；酸可挥发性硫(AVS)；铬还原硫；磷形态分级中图分类号：X524文献标
3、识码：A文章编号：1000-6923(2012)04-0666-08EffectofexternalsulfateonfractionofphosphorusinthesurfacesedimentfromLakeNanhuinWuhan.YUAN1,21*111Tan,HUAYu-mei,ZHUDuan-wei,DINGMin,CAIJian-bo(1.CollegeofResourcesandEnvironment,HuazhongAgriculturalUniversity,Wuhan430070,China；2.DezhouEnvironmentalMonitori
4、ngCentralStation,Dezhou253034,China).ChinaEnvironmentalScience,2012,32(4)：666~673Abstract：TheresponseofphosphorusfractioninthesedimentsfromLakeNanhuinWuhantotheinputofsulfatewasinvestigatedbasedontheindoorsimulationexperiments.Itshowedthatsulfateinputimprovedthemobilityofphosphorusinsedime
5、nts,resultingintheincreaseofconcentrationsoftotalphosphorus(TP)andsolublereactivephosphorus(SRP)intheoverlyingwater.Higherexternalsulfateconcentrationexperiencedgreaterincreaseofphosphoruscontentsintheoverlyingwater.Thecontentsofacidvolatilesulfur(AVS)inthesedimentsinitiallyincreasedandthe
6、nfell,whilethechromiumreduciblesulfurkeptthetrendofincrease.ItindicatedthattheAVSinthesedimentswasproducedafterthesulfatepenetratedtothesediments,followedbythetransformationofAVStochromiumreduciblesulfur.pHincreasedandEhdecreasedduetothereductionofsulfateinthesediments.Theeffectofsulfatein
7、putwasmuchdifferentforthedifferentfractionsofphosphorusinthesediments.ThecontentsofCa2-Pincreasedwiththeincreaseofsulfateconcentration.TheFe-Pwiththehighestcontentinthesediments(51.4%~56.6%oftotalphosphorus),wassignificantlyinfluencedbythesulfate(P<0.01).Itrel
