环境因素对长寿湖底泥释磷影响的模拟实验研究.pdf

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1、第7卷第5期VO1．7．NO．52013年5月Mav2013环境因素对长寿湖底泥释磷影响的模拟实验研究周欣郭海涛张进忠徐金祥徐卫红(1．西南大学资源环境学院／三峡库区生态环境教育部重点实验室，重庆400715；2．重庆市农业资源与环境重点实验室，重庆400716){e8摘要肥水养殖显著增加了长寿湖底泥中的磷含量。为了解肥水养殖积累在湖泊底泥中磷的释放情况，以长寿湖大坝口枯水期底泥为实验材料，模拟研究了不同环境条件(上覆水pH、温度、DO含量和扰动)下湖泊底泥的释磷特征。结果表明，在弱碱性条件下，底泥释磷量随上覆水pH的升高而升高；温度升高有

2、利于底泥磷的释放，温度每升高5℃，第21天环a叭时底泥释磷量增大0．0045～0．0074mg／L；DO含量降低有利于底泥中铁／铝结合态磷的释放；扰动对底泥磷的释放没有明境f显影响。研究表明，网箱养殖增加了底泥中的有机磷含量，促进有机磷向无机磷转化，增大了底泥中磷的释放风险。工V关键词长寿湖底泥磷释放环境因素模拟实验中图分类号X524文献标识码A文章编号1673—9108(2013)05—1671—05程～学肌SimulatedstudyonphosphorusreleasefromsedimentinChangshouaLakeinflu

3、encedbyenvironmentalfactors报gZhouXinGuoHaitaoZhangJinzhong-XuJinxiangXuWeihongr(1．KeyLaboratoryofEco—EnvironmentsinThreeGorgesReservoirRegion，MinistryofEducation，gCollegeofResourcesandEnvironment，SouthwestUniversity，Chongqing400715，China；2．ChongqingKeyLaboratoryofAgricultu

4、ralResourcesandEnvironment，Chongqing400716，China)AbstractFertilizerwatercultureobviouslyincreasedtheamountofphosphorusinthesedimentofChang—shouLake．Toknowthereleasesituationofphosphorusaccumulatedinlakesedimentbyfertilizerwaterculture，thesedimentcollectedfromChangshouLaked

5、uringlowwaterperiodwasusedastheexperimentalmaterial，thereleasecharacteristicsofphosphorusfromlakesedimentwerestudiedbysimulationexperimentunderdifferentenvironmentalconditions(overlyingwaterpH，temperature，DOcontentanddisturbance)．Theresultsshowedthatthereleaseamountsofphos

6、phorusfromthesedimentincreasedwithpHvalueoftheoverlyingwaterincreas—ingunderweaklyalkalinecondition．Hightemperaturepromotedphosphorustoreleasefromthesediment，there—leaseamountofthe21stdayincreased0．0045～0．0074mg／Lwhenthetemperatureincreasedevery5cc．LowDOcontentpromotedFe／A

7、1一Ptoreleasefromthesediment，anddisturbancehadnodistinctinfluenceonphos—phorusreleasefromthesediment．Thisstudyrevealedthatcagecultureincreasedthecontentoforganicphos—phorousinthesediment，andpromotedorganicphosphoroustotransformintoinorganicphosphorous，whichmayincreasetherel

8、easeriskofphosphorusfromthesediment．KeywordsChangshouLake；sediment；phosphorusrelease；envi