烤煙對鎘、鋅復(fù)合污染的響應(yīng)與金屬積累特性.pdf

1、Y938751分類號(hào)密級(jí)單位代碼：10019學(xué)號(hào)：S03024氣譎差≮夭普碩士學(xué)位論文烤煙對鎘、鋅復(fù)合污染的響應(yīng)與金屬積累特性GrowthResponseandMetalAccumulationofTobaccoPlantstoComplexSupplyLevelsofCdandZn研究生：黨縫指導(dǎo)教師：夏童塹教授申請學(xué)位類別：王堂亟專業(yè)領(lǐng)域名稱：孤境蘭程研究方向：疊縫注鎏位堂所在學(xué)院：資源生疊藍(lán)堂瞳二零零六年六月AbstractInc

2、ubationandpotexperimentswerecarriedouttostudytheCAuptakeandtranslationoftobaccoplantsincombinedheavymetalcontaminatedsoils，theCdaccumulationinthedifferentperiods，growthresponsesundercadmium／zinccomplexpollutedconditions，

3、CdformsinsoilandtheeffectofmetalaccumulationoftobaccoThemainresultswereshownasfollows：CdzcapableofstimulatingtheseedgerminationandseedlinggrowthatlowerconcentrationsandinhibitingtheseedgerminationathigherconcentrationsAs

4、lightantagonismeffectinseedgerminationwasproducedwhenCd，ZnatlowerconcentrationsFurthermore，ansynergisticeffectoccurredwhenCd，znathighereoncen訂ationsComp“edtoothercropstobaccocmaccumulaterelativelyhighlevelsofCdCdaccumula

5、tionincropplantssuchastobaccocarlleadtohumanexposuretothiscarcinogenicmetalCdandZnwereaddedtotheunpollutedsoftwithCdconcentrationofo，1，3，5，10mgkg“andZnconcentrationwith0100mgkg“1，respectivelyandstabilizedfor60daysOnetoba

6、ccoseedlingWaStransplantedtoeachpotcontain5l喀soilTheresultsshowedthecontentofchlorophylla、chlorophyllbinleavesoftobacco、plantheight、dryweightsofrootsandshootdecreasedsignificantlywiththeincreaseinCdadditionexceptforthetr

7、eatmentreceiving1nag‘kg1CdZntreatmentenhancedthegrowthoftobaccoplantanddecreasedCAconcentrationTheconcentrationsofCAindifferentpartsoftobaccoincreasedwiththeineaseinCdadditioninsoilTherankofCdconcentrationindifferentpart

8、sofleavesisasfollows：lowerleavesmiddeleavesUpI籠XleavesAsthetimewenton，theCdconcentrationindifferentorgansoftobaccodecreasedInthe卵ophase，therankofCAconcentrationIndifferentpartsoftobaccoisleavesstemroots；intheanaphasether

9、ankisleavesrootsstemOurresultsalsodemonstratethatthereisacompetitionsystembothforZnandCduptakeanditisusefulstrategytominimizetheCduptakeandimprovedtobaccoyi枷through7anapplicationinthefieldResidualformisthemainexistencefo

10、rmofthesoil例whencdisatlowerconcentrationsexchangeableformandcarbonatecombinedformisthemainexistenceformofthesoilCdwhenCdisathigherconcenlIationsThecontentofcarbonatecombinedCdshowedanegativecorrelationwiththedryweightofr