草甘膦与Cu的复合污染与其对土壤酶与微生物碳2f氮的影响

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1、两南大学硕十学伊论文英文摘要StudyofcombinedpollutionbetweenglyphosateandCuanditsinfluenceonthesoilenzymeandmicroorganismcarbon／nitrogenApplicantforMasterDegree：CuiYuxiaSupervisor：Prof．ChenYuchengProf．ZhouDongmeiAbstractThispapertakingherbicideglyphosatesandthecopperastypicalmodelorganicmattersa

2、ndtheheavymetalpollutants，CombinedpollutionbetweenglyphosateandCuanditsinfluenceonthesoilenzymeandmicroorganismcarbonandnitrogenwerestudiedandthemainresultsweresummarizedasfollows：TheeffectofglyphosateontheleachingofCufromaheavymetalcontaminatedsoilwasstudiedinthelaboratoryusingsi

3、evedsoilcolumns．TheCucontentintheleachingfluidandtheheavymetalbiologicalvaliddensityofearthpyramidlowerlevelinsoilhadbeenincreasedbecauseoftheexistenceofglyphosate．AdsorptionkineticsofglyphosateandCuwerestudiedusingacontinuousflowexperimentalsetupontwosoilswithdifferentcharacteris

4、tics．OnWuShansoil，theadsorptivecapacityofCu2+isbiggerthantheRedsoil，becausecompareswiththeRedsoil，WuShansoilhasthehighcationexchangequantity,thepHvalueandtheorganiccontent．ButtheadsorptivecapacityofglyphosateishigherthanontheRedsoil．Lagergren—first—orderkineticmodelfittheexperimen

5、taldataofglyphosateandCu“adsorptionthebest．GlyphosatesignificantlyincreasedtheadsorptionquantityofCu“ontheRedsoil，DuetoglyphosateonRedsoilhashighaffinity,glyphosatebetweenRedsoilandCu2+asa“bridge",thusincreasedtheRedsoiltotheCu2+adsorption，However，glyphosatedecreasedtheadsorptiono

6、fCu“ontheWushansoil，becauseadsorptionofglyphosateoilthissoilwasweak，andthecomplexofglyphosateandCu2+tendedtobehighlysolubleinwater,thuspreventingCu2+fromexchangingwithCa2+andMg“ionsonthesoilsurface．Ontheotherhand，thepresenceofCu“decreasedtheadsorptionofglyphosateonbothsoils，whichm

7、aybeattributedtotheloweraffinityofCuZ+-glyphosatecomplextothesoilsthantheaffinityofglyphosatealone．III两南大学硕十学付论文英文摘要ThepresenceofcopperreducedthebiomassofrapeobViously，becauseWechosetheglyphosate—tolerantrape，thepresenceofglyphsoatedidnotaffectthebiomassofrape．Thepresenceofcopperi

8、ncreasedtheabsorptionofcopperinth