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1、第22卷第12期环境科学研究Vol.22,No.122009年12月ResearchofEnvironmentalSciencesDec.,2009苏州河网区河道上覆水与底泥中氮素形态分布特征12*11魏荣菲,庄舜尧,戎静,杨浩1.南京师范大学地理科学学院,江苏南京2100462.中国科学院南京土壤研究所,土壤与农业可持续发展国家重点实验室,江苏南京210008摘要:以苏州河网区河道为研究对象,分布式采集10个采样点,分析水质状况和底泥中氮素形态与含量及其剖面分布,以探讨上覆水和底泥中各形态氮的相关性.结果表明:上覆水中(总氮
2、),(总磷)及(CODCr)均超标,水质呈弱碱性,(硝态氮)(110~239mgL)均高于(铵态氮)(030~170mgL),80%的采样点水质为劣类,水质污染严重,且以氮污染为主;底泥中w(总氮)为278~630gkg,其随沉积深度的增加而减少,说明河道污染负荷有逐年加重的趋势;底泥中w(铵态氮)为372~2280mgkg,其随沉积深度的增加而增加,说明铵态氮的沉积量在逐年减少;底泥中w(硝态氮)为131~694mgkg,其在各点的剖面变化趋势不尽相同,这可能与河道水体流动性较大有关.相关性分析和空间关系分
3、析显示,虽然上覆水中各形态氮含量和底泥表层中各形态氮含量点位对应的关系不显著,但在空间上存在一定的关联性,即由于水体的流动性,使得底泥到上覆水的氮含量高值区有从东向西迁移的趋势.关键词:底泥;总氮;铵态氮;硝态氮;剖面分布中图分类号:X524文献标志码:A文章编号:1001-6929(2009)12-1433-07CharacteristicsofNitrogenDistributioninRiverWaterandSedimentsintheTypicalRiverNetworkRegionofSuzhouCity1211WEIRon
4、g-fei,ZHUANGShun-yao,RONGJing,YANGHao1.SchoolofGeographyScience,NanjingNormalUniversity,Nanjing210046,China2.StakeKeyLaboratoryofSoilandSustainableAgriculture,InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008,ChinaAbstract:Tenselectedsitesweresampledintypicalrive
5、rnetworkregionofSuzhouCity.Thequalityofriverwaterandthecontentsofvariousnitrogenformsinthesedimentprofilesweremeasured.Therelationshipamongvariousnitrogenformsinthewaterandsedimentwasdiscussed.TheresultsshowedthatthecontentsofTN,TPandCODCrintheriverwaterexceededthestatestandar
6、dofwaterquality,andthewaterwas-+slightlyalkaline.ThecontentofNO3-N(110-239mgL)washigherthanthatofNH4-N(030-170mgL)inthewater.Thewater,ofwhich80%wasworsethanthegradeofwaterquality,waspollutedseriously.Themajorpollutionoftheriverwaterresultedfromnitrogen.Inthesediment,the
7、contentofTNrangedfrom278to630gkg,anditdecreasedwithincreasingsedimentdepth,suggestingthatthe+pollutionofriverswasbecomingmoreandmoreseriousyearafteryear.ThecontentofNH4-Nrangedfrom372to2280mgkginthe+sediments.Itincreasedwithincreasingsedimentdepth,indicatingthattheconten
8、tofNH4-Ndecreasedyearafteryear.Thecontentof--NO3-Nrangedfrom1
