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1、中國環(huán)境科學(xué)2014,34(8):2071-2077ChinaEnvironmentalScience疏浚對湖泛的影響:以太湖八房港和閭江口水域為例陳超‘,鐘繼承,范成新,申秋實,劉成1,2(1.中國科學(xué)院南京地理與湖泊研究所湖泊與環(huán)境國家重點實驗室,江蘇南京210008:2.中國科學(xué)院大學(xué),北京100049)摘要:通過采集太湖八房港和閶江口疏浚后與未疏浚沉積物柱狀樣于室內(nèi)模擬“湖泛”的發(fā)生與消退過程來研究底泥疏浚對藻源性“湖泛”形成和消退的影響.結(jié)果發(fā)現(xiàn),疏浚能有效的延緩“湖泛”發(fā)生的時間,八房港和閭江口疏浚后沉積物柱狀樣水體色度均要低于未疏浚對照樣,水體泛黑的時間也分別比未疏浚對照樣延
2、遲6d和2d.疏浚沉積物對上覆水柱中營養(yǎng)鹽的含量也有較好的控制,試驗過程中八房港和閭江口疏浚后沉積物柱狀樣水體中NH4—N的含量僅分別未疏浚對照組的40%和77.1%,po43-p的含量也僅分別為未疏浚對照組的41.4%和78.1%.值得注意的是,疏浚沉積物所對應(yīng)的水柱中Fe和S的含量均要高于未疏浚對照組.八房港和閭江口疏浚沉積物中亞鐵的含量分別是未疏浚對照樣的78.1%和76.4%,而閶江口疏浚后沉積物中酸揮發(fā)性硫化物(AVS)的含量則是未疏浚對照的1.36倍.沉積物中鐵、AVS的含量沒有表現(xiàn)出明顯的垂向分布特征.關(guān)鍵詞:底泥疏浚:藻源性湖泛:太湖中圖分類號:X524文獻標(biāo)識碼:A文章編
3、號:1000—6923(2014)08—2071—07Efectsofsludgedredgingonblackbloom:acasestudyofBafangportandLujiangportofTaihuLake.CHENChao,ZHONGJi-cheng,F(xiàn)ANCheng-xin,SHENQiu-shi,LIUCheng~z(1.StateKeyLaboratoryofLakeScienceandEnvironment,NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,Ch
4、ina;2.UniversityofChineseAcademyofSciences,Beijing100049,China).ChinaEnvironmentScience,2014,34(8):2071-2077Abstract:Inordertoestimatetheefectsofdredgingonthepreventionandcontrolofblackbloom,fourintactsedimentcoreshadbeensampledfromdredgedandun-dredgedareasofBafangportandLujiangporttosimulationthe
5、occurrenceandregressionofalgae—causedblackbloomwithY-shapeapparatus.Resultsshowedthatdredginghasagoodefectonpreventionthedegreeofalgae—causedblackbloom.Thecolorofwaterindredgedtreatmentgroupwaslighterthanthecontrol,andtheoccurrencetimeofblackbloomindredgedsitesofBafangportandLujiangportWasdelayed6
6、daysand2days,respectively.TheconcentrationsofNH4—lN.P043-pinoverlyingwaterofdredgedtreatmentgroupofBafangportandLujiangportwereonly40%,77.1%,41.4%and78.1%ofcontroltreatment,andtheconcentrationsofFez+andSinoverlyingwaterof&edgedtreatmentgroupwerehigherthancontro1.TheconcentrationsofFe2+insedimentso
7、fdredgedsitesofBafangportandLujiangportwere78.1%and76.4%ofcontrolsites.a(chǎn)ndtheconcentrationofAcidVolatilesulphide(AVS)indredgedsiteofLujiangportwas1.36timesthancontro1.VerticaldistributioncharacteristicsofFeandAVS