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时间:2019-05-16
《不同pH条件下太湖入湖河道沉积物磷的释放》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、生态与农村环境学报2008,24(4):57~62JournalofEcologyandRuralEnvironment不同pH条件下太湖入湖河道沉积物磷的释放李兵r,袁旭音①,邓旭(1.河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210024;2.河海大学环境科学与工程学院,江苏南京210024)摘要:对不同pH条件下太湖西部主要入湖河道沉积物中溶解性活性磷(SRP)和总溶解性磷(TDP)的采样分析结果表明,中部入湖河道SRP与TDP的释放表现出明显的不一致性,北部和南部入湖河道SRP和TDP的释放基本一致,只是在强碱性条件下,某些河流2种磷的释放变化不一致。营养程度高的
2、河道,沉积物磷在碱性条件下容易释放;营养程度低的河道,沉积物磷在酸性条件下容易释放。因此,应当考虑碱化(或酸化)引起的磷释放风险。FeP和Ca—P含量及2者比值与河道的营养状况有关,也与沉积物磷的释放量有关,表明沉积物磷的形态组成对磷的释放影响明显。湖泊因自身的水动力条件差和对营养元素的富集,营养程度高于河道,湖泊沉积物磷的释放量也较大。关键词:pH;磷;沉积物;营养水平;太湖中图分类号:X131.2;X522文献标识码:A文章编号:1673~4831(2008)04—0057—06PhosphorusReleaseofSedimentsinIn-flowingRiversoftheT
3、aihuLakeAsAfectedbypH.LIBing.YUANXu—yin,DENGXu(1.StateKeyLaboratoryofHydrology—WaterResourcesandHydraulicEngineering,HohaiUniversity,Nanjing210024,China;2.SchoolofEnvironmentalSciencesandEngineering,HohaiUniversity,Nanjing210024,China)Abstract:Samplesofsedimentscollectedfromriversflowingintothew
4、esternpartoftheTaihuLakewereanalyzedforre—leaseofsolublereactivephosphorus(SRP)andtotaldissolvedphosphorus(TDP)asafectedbypH.ResultsshowthatreleaseofSRPandTDPvariedshaq?lybetweenriversflowingintotheTaihuLakeinthemiddleofthesection,andre—mainedmoreorlessthesamebetweenriversinthenorthandthoseinthe
5、southofthesection,exceptwhenpHwasveryhigh.Inrivers,high(orlow)innutrientcontent,phosphorusinsedimentsisliabletoreleaseinalkaline(oracidic)condition.Itis,therefore,advisabletotakeintoaccounttheriskofalkalizationoracidificationtriggeringphosphorusre—lease.Fe—PandCa—Pcontentsandtheirratioarerelated
6、tonutrientcontentoftheriversandphosphorusreleasefromthesedimentsaswell,suggestingthatmorphologicalcompositionofthephosphorusinsedimentsaffectsphosphorusreleaseob—viously.AstheTaihuLakeperseislowerinhydrodynamics,buthigherinnutrientcontentthantherivers,thesedimentsinthelakereleasemorephosphorusth
7、anthoseintherivers.Keywords:pHvalue;phosphorus;sediment;nutrientlevel;TaihuLake磷是水体富营养化的重要因子,而沉积物中的较多,但对入湖河道的研究相对较少。pH值是影响磷是重要的内源污染物,磷的释放是决定湖泊上覆沉积物磷释放的关键性因素。已有研究表明,pH值水体磷含量的重要因素。特别是在外源磷不足时,变化能将磷从与Fe、Al结合中释放出来,增加沉积沉积物中磷的释放提供了
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