太湖草_藻型湖区沉积物_水界面环境特征差异

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1、J．LakeSci．(湖泊科学)，2013，25(2):199-208http://www．jlakes．org．E-mail:jlakes@niglas．ac．cn2013byJournalofLakeSciences*太湖草/藻型湖区沉积物-水界面环境特征差异1，2212＊＊王永平，朱广伟，洪大林，秦伯强(1:南京水利科学研究院水文水资源与水利工程科学国家重点实验室，南京210029)(2:中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室，南京210008)摘要:在太湖草、藻型湖区进行冬、夏两季多点采样，分别对采样点的水环境

2、特征、泥面以上5cm上覆水中营养盐以及沉积物的含水量、中值粒径、有机碳、氮、磷、金属元素和溶解氧进行测定．结果表明:夏季藻型湖区表层水体pH高于中、底层，冬季草型湖区各层水体pH高于藻型;草型湖区水体浊度夏季低于藻型，冬季反之;藻型湖区上覆水中的硝态氮和磷酸根浓度显著高于草型;草型湖区沉积物中含水量冬季显著高于夏季;草型湖区沉积物中总有机碳显著高于藻型;Fe、Zn、Ca、Pb、Na和K等元素在草、藻型湖区间差异显著;沉积物中溶解氧表现为冬季深于夏季，藻型深于草型的规律．关键词:沉积物-水界面;草型湖区;藻型湖区;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