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1、中國(guó)環(huán)境科學(xué)2014,34(8):2078~2085ChinaEnvironmentalScience小興凱湖表層底泥磷吸附容量及潛在釋放風(fēng)險(xiǎn)于淑玲,李曉宇,張繼濤,陳國(guó)雙,李秀軍(1.中國(guó)科學(xué)院濕地生態(tài)與環(huán)境重點(diǎn)實(shí)驗(yàn)室,中國(guó)科學(xué)院東北地理與農(nóng)業(yè)生態(tài)研究所,吉林長(zhǎng)春130102;2.中國(guó)科學(xué)院大學(xué),北京100049)摘要:利用沉積物磷吸附指數(shù)(PsI)和磷吸附飽和度(DPs)研究了小興凱湖表層沉積物的磷吸附容量,分析了沉積物中磷的吸附飽和度(DPS)與其他指標(biāo)的相關(guān)關(guān)系,并討論了不同采樣點(diǎn)湖泊沉積物中磷的潛在釋放風(fēng)險(xiǎn).結(jié)果
2、表明:13個(gè)采樣點(diǎn)的表層沉積物的PSI為9.78~197.53(rag·L)/(1OOg·0too1),平均值為59.77(mg·L)/(100g·~mo1);DPS為9.95~/~24.47%,平均值為15.41%.PSI與草酸銨提取的磷(P0)極顯著正相關(guān),與草酸銨提取的鐵、鋁(Fe,A10x)顯著正相關(guān),草酸銨提取的鐵是影響PSI的主導(dǎo)因素;DPS主要受沉積物中原有吸附態(tài)磷的影響.此外,磷釋放風(fēng)險(xiǎn)指數(shù)(Em)8.99%~129.94%的計(jì)算結(jié)果表明_,J、興凱湖表層沉積物中磷釋放誘發(fā)富營(yíng)養(yǎng)化的風(fēng)險(xiǎn)處于高度風(fēng)險(xiǎn)范圍,其
3、中,受農(nóng)業(yè)面源污染影響較大的北岸區(qū)域相比其他區(qū)域發(fā)生富營(yíng)養(yǎng)化的風(fēng)險(xiǎn)更高.關(guān)鍵詞:磷吸附指數(shù);磷吸附飽和度;富營(yíng)養(yǎng)化風(fēng)險(xiǎn);鐵鋁氧化物;小興凱湖中圖分類(lèi)號(hào):X524,X142文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—6923(2014)08—2078—08PhsophorussorptioncapacityofsurfacesedimentsandriskassessmentofpotentialphosphorusreleaseinLakeXiaoxingkai,China.YUShu.1ing,,LIXiao.yu,ZHANGJi
4、.tao,CHENGuo.shuang,LIXiu~un(1.KeyLaboratoryofWetlandEcologyandEnvironment,NortheastInstituteofGeographyandAgroecology,ChineseAcademyofSciences,Changchun130102,China;2.UniversityofChineseAcademyofSciences,Beijing100049,China).ChinaEnvironmentalScience,2014,34(8):2
5、078-2085Abstract:Phosphorussorptioncapacityofsurfacesedimentsareestimatedbyphosphorussorptionindex(PSI)ofsedimentsanddegreeofphosphorussaturation(DPS)inLakeXiaoxingkai,China.TherelationshipbetweenDPSandotherindicatorswereanalyzed,andtheriskofpotentialphosphorusrel
6、easewerediscussedbycalculatingphosphorusreleaseriskindex(ERI).TheresultsshowedthatPSIrangedfrom9.78to197.53(mgL)/(100g’gmo1),withanaverageof59.77(mg’L)/(100g-gtmo1).DPSrangedfrom9.95%to24.47%.withanaverageof15.41%.PS1wassignificantlyandpositivelyco.elatedtophospho
7、rus(P0x),iron(Fe0x)andaluminum(Alox)extractedfromsedimentbyammoniumoxalate.RionextractedfromsedimentbyammoniumoxalatemightbethemainfactortoafectPSI.DPSWasinfluencedmainlybyoriginaladsorbedphosphorusofsediments(orPox).Inaddition,ERIrangedfrom8.99%to129.94%,whichind
8、icatedthattheLakeXiaoxingkaimightbeinhighpotentialeutrophicationriskduetothereleaseofphosphorusfromsurfacesediments.Comparedtothediferentsamplepoints,th