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1、J．LakeSci．(湖泊科學(xué))，2014，26(2)：177—184http：／／www．jlakes．org．E—mail：jlakes@niglas．a(chǎn)c．cn⑥2014byJournalofSciences太湖草源性“湖泛"水域沉積物營養(yǎng)鹽釋放估算中秋實(shí)，周麒麟，邵世光，劉成，張雷，范成新(1：巾國科學(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，南京210008)(2：巾國科學(xué)院大學(xué)，北京100049)(3：河海大學(xué)水文水資源學(xué)院，南京210098)摘要：于太湖草源性“湖泛”暴發(fā)期，采集柱狀沉積物并應(yīng)用peeper被動采樣裝置獲
2、得“湖泛”區(qū)原位沉積物間隙水．泥水樣品分析表明：“湖泛”發(fā)生水域表層(0～7cm)沉積物的含水率、孑L隙度和有機(jī)質(zhì)含量均明顯高于對照區(qū)，其中有機(jī)質(zhì)含量更是對照區(qū)樣品的4倍左右，沉水植物殘?bào)w促使表層沉積物物化性質(zhì)改變的作用明顯；“湖泛”發(fā)生水域表層沉積物間隙水中銨態(tài)氮(NH4+一N)、溶解性反應(yīng)磷(SRP)及“含量遠(yuǎn)高于未發(fā)生Ⅸ，植物殘?bào)w降解對沉積物厭氧環(huán)境的營造顯著．運(yùn)用分子擴(kuò)散模型對沉積物釋放通量估算：“湖泛”發(fā)生區(qū)沉積物NH4+一N、SRP和Fe的釋放速率分別是對照區(qū)的49．8、15．3和123．1倍．研究認(rèn)為，草源性“湖泛”水體氮、磷
3、等營養(yǎng)物含世升高的主要原因是沉積物的釋放，而“湖泛”所營造的厭氧環(huán)境是氮、磷釋放急劇增加的主要驅(qū)動因素．關(guān)鍵詞：湖泛；氮；磷；沉積物釋放；peeper；太湖Estimationof／n-situsedimentnutrientsreleaseatthesubmergedplantinducedblackbloomareainLakeTaihuSHENQiushi，ZHOUQilin。一，SHAOShiguang，LIUCheng。一，ZHANGLet‘&FANChengxin‘(1：StateKeyLaboratoryofSciencean
4、dEnvironment，NanjingInstituteofGeographyandLimnology，ChineseAcademyofSciences，Nanjing210008，P．R．China)(2：UniversityofChineseAcademyofSciences，BeOing100049，P．R．China)(3：CollegeofHydrologyandWaterResource，HohaiUniversity，Nanjing210098，P．R．China)Abstract：Duringthesubmergedpla
5、ntinducedblackbloomperiodinLakeTaihu，sedimentcoreswerecollectedandporewaterswereaequiredusingpeeperin—situpassiveporewatersamplersattheblackbloomandthecontrolareas．Thesedimentsanalysisre—suitsshowedthatthewatercontent，porosityandorganicmatter(LOI)wereobviouslyhigherinthesu
6、rfacesediment(0—7cm)intheblackbloomareathanthoseinthecontrolarea，amongwhichtheLOIcontentswereabout4timeshighcr．Thephysicalandehemicalcharacteristicsofsurfacesedimentswereinfluencedbythesubmergedplantresiduesgreatly．Ammonium(NH4+一N)，sol-ublereactivephosphorus(SRP)andFeconte
7、ntsinsurfaceporewatersattheblackbloomareaweresignificantlyhigherthanthoseatthecontrolarea．ThesedimentreleasefluxesofNH4+-N，SRP，andFewerealsoestimatedbyusingtheporewaterdif-filsionmodelapproach．Comparedtothecontrolarea，thereleasefluxesofNH4+一N，SRP，andFeintheblaekbloomareawe
8、re49．8，15．3，and123．1timeshigher，respectively．Theresearchimpliedthattheincreaseofnutrients
