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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?yàn)槔惓?,鐘繼承,范成新,申秋實(shí),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(diǎn)實(shí)驗(yàn)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(shí)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
2、疏浚對照樣,水體泛黑的時(shí)間也分別比未疏浚對照樣延遲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(yàn)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)
3、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(hào):X524文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—6923(2014)08—2071—07Efectsofsludgedredgingonblackbloom:acasestudyofBafangportandLujiangportofTaihuLake.CHENChao,ZHONGJi-cheng,F(xiàn)ANCheng-xin,SHENQiu-shi,LIUCheng~z(1.StateKeyLaboratoryofLakeScienceandEnvironment,NanjingIn
4、stituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China;2.UniversityofChineseAcademyofSciences,Beijing100049,China).ChinaEnvironmentScience,2014,34(8):2071-2077Abstract:Inordertoestimatetheefectsofdredgingonthepreventionandcontrolofblackbloom,fourintacts
5、edimentcoreshadbeensampledfromdredgedandun-dredgedareasofBafangportandLujiangporttosimulationtheoccurrenceandregressionofalgae—causedblackbloomwithY-shapeapparatus.Resultsshowedthatdredginghasagoodefectonpreventionthedegreeofalgae—causedblackbloom.Thecolorofwaterindredgedtr
6、eatmentgroupwaslighterthanthecontrol,andtheoccurrencetimeofblackbloomindredgedsitesofBafangportandLujiangportWasdelayed6daysand2days,respectively.TheconcentrationsofNH4—lN.P043-pinoverlyingwaterofdredgedtreatmentgroupofBafangportandLujiangportwereonly40%,77.1%,41.4%and78.1%
7、ofcontroltreatment,andtheconcentrationsofFez+andSinoverlyingwaterof&edgedtreatmentgroupwerehigherthancontro1.TheconcentrationsofFe2+insedimentsofdredgedsitesofBafangportandLujiangportwere78.1%and76.4%ofcontrolsites.a(chǎn)ndtheconcentrationofAcidVolatilesulphide(AVS)indredgedsite
8、ofLujiangportwas1.36timesthancontro1.VerticaldistributioncharacteristicsofFeandAVS