太湖草源性_湖泛_水域沉積物營(yíng)養(yǎng)鹽釋放估算

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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．cn2014byJournalofLakeSciences*太湖草源性“湖泛”水域沉積物營(yíng)養(yǎng)鹽釋放估算11，231，211＊＊申秋實(shí)，周麒麟，邵世光，劉成，張雷，范成新(1:中國(guó)科學(xué)院南京地理與湖泊研究所湖泊與環(huán)境國(guó)家重點(diǎn)實(shí)驗(yàn)室，南京210008)(2:中國(guó)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

2、集柱狀沉積物并應(yīng)用peeper被動(dòng)采樣裝置獲得“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、孔隙度和有機(jī)質(zhì)含量均明顯高于對(duì)照區(qū)，其中有機(jī)質(zhì)含量更是對(duì)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+2+間隙水中銨態(tài)氮(NH4-N)、溶解性反應(yīng)磷(SＲP)及Fe含量遠(yuǎn)高于未發(fā)生區(qū)，植物殘?bào)w降解對(duì)沉積物厭氧環(huán)境的營(yíng)造+2+顯著．運(yùn)用分子擴(kuò)散模型對(duì)沉積物釋放通量估算:“湖泛”發(fā)生區(qū)沉積物NH4-N、SＲP和Fe的釋放速率分別是對(duì)照區(qū)的49．

3、8、15．3和123．1倍．研究認(rèn)為，草源性“湖泛”水體氮、磷等營(yíng)養(yǎng)物含量升高的主要原因是沉積物的釋放，而“湖泛”所營(yíng)造的厭氧環(huán)境是氮、磷釋放急劇增加的主要驅(qū)動(dòng)因素．關(guān)鍵詞:湖泛;氮;磷;沉積物釋放;peeper;太湖Estimationofin-situsedimentnutrientsreleaseatthesubmergedplantinducedblackbloomareainLakeTaihu11，231，211SHENQiushi，ZHOUQilin，SHAOShiguang，LIUCheng，ZHANGLei＆FAN

4、Chengxin(1:StateKeyLaboratoryofLakeScienceandEnvironment，NanjingInstituteofGeographyandLimnology，ChineseAcademyofSciences，Nanjing210008，P．Ｒ．China)(2:UniversityofChineseAcademyofSciences，Beijing100049，P．Ｒ．China)(3:CollegeofHydrologyandWaterＲesource，HohaiUniversity，Nanj

5、ing210098，P．Ｒ．China)Abstract:DuringthesubmergedplantinducedblackbloomperiodinLakeTaihu，sedimentcoreswerecollectedandporewaterswereacquiredusingpeeperin-situpassiveporewatersamplersattheblackbloomandthecontrolareas．Thesedimentsanalysisre-sultsshowedthatthewatercontent，

6、porosityandorganicmatter(LOI)wereobviouslyhigherinthesurfacesediment(0-7cm)intheblackbloomareathanthoseinthecontrolarea，amongwhichtheLOIcontentswereabout4timeshigher．Thephysicaland+chemicalcharacteristicsofsurfacesedimentswereinfluencedbythesubmergedplantresiduesgreat

7、ly．Ammonium(NH4-N)，sol-2+ublereactivephosphorus(SＲP)andFecontentsinsurfaceporewatersattheblackbloomareaweresignificantlyhigherthan+2+thoseatthecontrolarea．ThesedimentreleasefluxesofNH4-N，SＲP，andFewerealsoestimatedbyusingtheporewaterdif-+2+fusionmodelapproach．Comparedt

8、othecontrolarea，thereleasefluxesofNH4-N，SＲP，andFeintheblackbloomareawere49．8，15．3，and123．1timeshigher，respectively．Theresear