太湖草_藻型湖區(qū)沉積物_水界面環(huán)境特征差異

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1、J．LakeSci．(湖泊科學(xué))，2013，25(2):199-208http://www．jlakes．org．E-mail:jlakes@niglas．a(chǎn)c．cn2013byJournalofLakeSciences*太湖草/藻型湖區(qū)沉積物-水界面環(huán)境特征差異1，2212＊＊王永平，朱廣偉，洪大林，秦伯強(qiáng)(1:南京水利科學(xué)研究院水文水資源與水利工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室，南京210029)(2: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)摘要:在太湖草、藻型湖區(qū)進(jìn)行冬、夏兩季多點(diǎn)采樣，分別對(duì)采樣點(diǎn)的水環(huán)境

2、特征、泥面以上5cm上覆水中營(yíng)養(yǎng)鹽以及沉積物的含水量、中值粒徑、有機(jī)碳、氮、磷、金屬元素和溶解氧進(jìn)行測(cè)定．結(jié)果表明:夏季藻型湖區(qū)表層水體pH高于中、底層，冬季草型湖區(qū)各層水體pH高于藻型;草型湖區(qū)水體濁度夏季低于藻型，冬季反之;藻型湖區(qū)上覆水中的硝態(tài)氮和磷酸根濃度顯著高于草型;草型湖區(qū)沉積物中含水量冬季顯著高于夏季;草型湖區(qū)沉積物中總有機(jī)碳顯著高于藻型;Fe、Zn、Ca、Pb、Na和K等元素在草、藻型湖區(qū)間差異顯著;沉積物中溶解氧表現(xiàn)為冬季深于夏季，藻型深于草型的規(guī)律．關(guān)鍵詞:沉積物-水界面;草型湖區(qū);藻型湖區(qū);太湖Environmen

3、talcharacteristicsofsediment-waterinterfaceofphytoplanktonandmacro-phytedominatedzonesinLakeTaihu1，2212WANGYongping，ZHUGuangwei，HONGDalin＆QINBoqiang(1:StateKeyLaboratoryofHydrology-WaterResourcesandHydraulicEngineering，NanjingHydraulicResearchInstitute，Nanjing210029，P．R．

4、China)(2:StateKeyLaboratoryofLakeScienceandEnvironment，NanjingInstituteofGeographyandLimnology，ChineseAcademyofSciences，Nanjing210008，P．R．China)Abstract:Theinvestigationwasconductedwithinlarge，shallowLakeTaihu，inwinterandsummer．5sitesinphytoplanktondom-inatedzoneand3site

5、sinmacrophytedominatedzonewerechosenforsampling．Parametersofsamplingsitesincludingwaterquali-ty，nutrientsconcentrationsin5-cmoverlayingwaterandverticalprofilesofwatercontent，meanvalueofgrainsize(D50)，totalorganiccarbon(TOC)，nitrogen，phosphorus，metalsanddissolvedoxygenwer

6、eanalyzed．Resultsshowedthat，surfacewaterpHinphytoplanktondominatedzonewashigherthanthatintheothertwolayersandwaterpHinwinterwashigherinmacrophytedom-inatedzonethanthatinphytoplanktondominatedzone;waternephelometricturbidityunitesinmacrophytedominatdzonewashigh-－3－erthant

7、hoseinphytoplanktondominatedzoneinsummerandcontrarilyinwinter;concentrationsofNO3-NandPO4-Pofoverla-yingwaterweresignificantlyhigherinphytoplanktondominatedzonethanthoseinmacrophytedominatedzone;sedimentwatercontentsinmacrophytedominatedzoneinwinterwassignificanthigherth

8、anthoseinsummer;sedimentTOCinmacrophytedomi-natedzonewassignificanthigherthanthatinphytoplanktondominat