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1、生態(tài)與農(nóng)村環(huán)境學(xué)報(bào)2008,24(4):57~62JournalofEcologyandRuralEnvironment不同pH條件下太湖入湖河道沉積物磷的釋放李兵r,袁旭音①,鄧旭(1.河海大學(xué)水文水資源與水利工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室,江蘇南京210024;2.河海大學(xué)環(huán)境科學(xué)與工程學(xué)院,江蘇南京210024)摘要:對(duì)不同pH條件下太湖西部主要入湖河道沉積物中溶解性活性磷(SRP)和總?cè)芙庑粤?TDP)的采樣分析結(jié)果表明,中部入湖河道SRP與TDP的釋放表現(xiàn)出明顯的不一致性,北部和南部入湖河道SRP和TDP的釋放基本一致,只是在強(qiáng)堿性條件下,某些河流2種磷的釋放變化不一致。營(yíng)養(yǎng)程度高的
2、河道,沉積物磷在堿性條件下容易釋放;營(yíng)養(yǎng)程度低的河道,沉積物磷在酸性條件下容易釋放。因此,應(yīng)當(dāng)考慮堿化(或酸化)引起的磷釋放風(fēng)險(xiǎn)。FeP和Ca—P含量及2者比值與河道的營(yíng)養(yǎng)狀況有關(guān),也與沉積物磷的釋放量有關(guān),表明沉積物磷的形態(tài)組成對(duì)磷的釋放影響明顯。湖泊因自身的水動(dòng)力條件差和對(duì)營(yíng)養(yǎng)元素的富集,營(yíng)養(yǎng)程度高于河道,湖泊沉積物磷的釋放量也較大。關(guān)鍵詞:pH;磷;沉積物;營(yíng)養(yǎng)水平;太湖中圖分類(lèi)號(hào):X131.2;X522文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):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磷是水體富營(yíng)養(yǎng)化的重要因子,而沉積物中的較多,但對(duì)入湖河道的研究相對(duì)較少。pH值是影響磷是重要的內(nèi)源污染物,磷的釋放是決定湖泊上覆沉積物磷釋放的關(guān)鍵性因素。已有研究表明,pH值水體磷含量的重要因素。特別是在外源磷不足時(shí),變化能將磷從與Fe、Al結(jié)合中釋放出來(lái),增加沉積沉積物中磷的釋放提供了