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1、J.LakeSci.(湖泊科学),2009,21(5):663-668http://www.jlakes.org.E-mail:jlakes@niglas.ac.cn©2009byJournalofLakeSciences*模拟水体pH控制条件下太湖梅梁湾沉积物中磷的释放特征1,21131袁和忠,沈吉,刘恩峰,孟祥华,王建军(1:中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京210008)(2:中国科学院研究生院,北京100049)(3:济南大学城市发展学院,济南250022)摘要:采用缓冲溶液控制水体pH值,模拟研究了
2、太湖梅梁湾沉积物扰动悬浮状态下水体磷的释放规律(48h),分析了实验前后沉积物中磷的赋存形态组成及变化特征.结果表明,pH条件对沉积物磷释放具有显著影响,强酸性(pH=2.0)及碱性(pH=9.5,11.8)条件下皆利于磷的释放,但强酸性水体磷含量随时间逐渐降低,而碱性水体磷呈持续释放状态;中性条件(pH=7.2)磷的释放释放作用不明显.磷释放达到稳定状态(14h)后,碱性条件下(pH=9.5,11.8)磷释放量为酸性(pH=2.0,4.6)及中性(pH=7.2)条件下的4倍以上.通过对比释放前、后沉积物中磷的形态组成可知,酸性条件主
3、要为钙结合态磷的释放;碱性条件主要是铁结合态磷释放,部分可发生再沉淀,转化为钙结合态磷.研究表明,梅梁湾沉积物中铁结合态磷的解析是沉积物磷的主要释放源,是水体内源磷增加的重要贡献者.关键词:沉积物;磷释放;磷形态;pH;太湖CharacteristicofphosphorusreleasewiththecontrolofpHofsedimentsfromMeiliangBay,LakeTaihu1,21131YUANHezhong,SHENJi,LIUEnfeng,MENGXianghua&WANGJianjun(1:StateKey
4、LaboratoryofLakeScienceandEnvironment,NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,P.R.China)(2:GraduateSchooloftheChineseAcademyofSciences,Beijing100049,P.R.China)(3:SchoolofCityDevelopment,UniversityofJinan,Jinan250022,P.R.China)Abstr
5、act:Thephosphorusstoredinthesedimentscanbereleasedintotheoverlyingwater,actingasinternalsourceforlakes.pHisoneoftheimportantfactorsinfluencingphosphorusrelease.Inthispaper,phosphorusfractionsandtheeffectofpHonPrelease(48h)wereinvestigatedforthesedimentfromMeiliangBay,La
6、keTaihu.ThepHofthesystemwascontrolledwithdifferentbuffersolutions.ThereleasecharacteristicsofphosphoruswereinfluencedmarkedlybythepHcondition.Specifically,acidity(pH=2.0)andalkalinity(pH=9.5,11.8)conditionsweremorebeneficialforphosphorusreleasethantheneutralpH(pH=7.2)co
7、ndition.Theamountofphosphorusreleasedfromthesedimentsunderalkalinityconditions(pH=9.5,11.8)wasabout4foldsthanthatintheacidity(pH=2.0,4.6)andneutralconditionwhenthereleaseofphosphorustendedtobestable(14h).Therehadbeendistinctdifferenceforthephosphorusspeciationinthesedim
8、entsofdifferentsimulationsystem.Withtheanalysistothephosphorusspeciationofsedimentsafterreleaseexperiment,itca
