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1、·摘要盐结合态。采样点中重金属Zn形态变异系数在0.55-0.68之间，相对于Cu元素变异系数较小。（4）鄱阳湖湿地土壤综合污染指数平均值为0.78，根据污染评价标准为警戒限。其中蔡家湾污染指数最高达到2.81，九江的土壤指数也达到了1.97，土壤中重金属Cu、Zn含量明显超标。（5）通过SPSS软件分析相关性得知：湿地土壤中Cu、Zn含量之间呈显著正相关，湿地土壤中重金属元素Cu、Zn含量与土壤有机质含量表现出显著正相关，与其他理化性质无明显相关性。采样点土壤中重金属Zn的碳酸盐态与土壤PH呈极显著负相关性，相关系数为-0.693。采样点土壤中重金属Zn、Cu残渣态与土壤有机质层极显著正
2、相关性，相关系数分别为0.677、0.746。（6）九江、蔡家湾和饶河土壤对重金属Cu、Zn吸附动力学实验表明：三处土壤对重金属Cu、Zn吸附在20min左右达到饱和。三点土壤对重金属Cu等温吸附都可用Langmuir方程和Freundlich方程来描述，从相关系数来看，以Langmuir方程拟合为佳，相关系数均大于0.9，达显著水平。三点土壤对重金属Zn等温吸附都可以用Langmuir方程和Freundlich方程来描述。（7）在初始液重金属浓度相同情况下，当pH由5.5增至6.5时，土壤对铜和锌的吸附随着pH上升而增加。温度的改变对土壤吸附Cu和Zn的特征不规律。（8）在Cu、Zn共存
3、条件下，土壤对重金属离子吸附量都小于单一重金属离子条件下吸附量，两种重金属离子之间存在共存竞争吸附，其中Cu的吸附能力大于Zn。关键词：鄱阳湖；湿地土壤；重金属；形态；吸附/解吸II···万方数据···AbstractAbstractWiththegrowthofpopulation,industrializationandurbanizationbecomefaster,theenvironmentalpollutionofPoyangLakeisincreasinglyserious,especiallyinheavymetalpollutionofwetlandsoil.Sother
4、esearchforheavymetalsinsoilhasbecomeahotspot,However,thesamemetalastheyexistindifferentformsinthesoil,itstransportortransformationcharacteristicsandpollutionnaturearedifferent,heavymetaltoxicityisnotonlyrelatedtoitstotalmass,speciesdistributionisdeterminedbyagreaterextent.Inthispaper,thewetlandsoi
5、lofPoyangLakewatershedtheobjectof
study,determinateditsamountofCu、Zn,anditscontentofvariousformswas
determinedbyusingextractionmethod,anddiscussesitsdistributioncharacteristics,
andthestatusofsoilheavymetalpollutioninthePoyangLakewetlandwere
evaluatedbyusingintegratedpollutionassessmentmethod.Inor
6、dertounderstandthe
migrationandtransformationofvariousformsofheavymetalinthesoil,throughthe
correlation,determinatedtherelationshipsbetweenthetotalamountanditsvarious
formsofheavymetalandsoilproperties.Bytheadsorptionkineticsexperiments,
analysedtheheavymetaladsorptionrateofwetlandsoils.Bytheisoth
7、ermal
adsorptionexperiments,analysedtheheavymetalsCu,Znadsorptioncharacteristics
ofwetlandsoil.Bytheisothermaldesorptionexperiments,analyzedtherelationship
betweentheamountofdesorptionandadsorption.Bychangingthes
