第七分会环境地理研究中的新问题新思路和新方法

[e-mail]“”2002~20031612002CuPbMnZnCr3425t/a2751t/a34.5×105t/a69505t/a14045t/a3176t/[e-mail]220048118)()11(1234512345)(12345123456)()p,p’-DDEp,p’-DDDp,p’-DDTDDXsDDXsDDXsDDXsDDXsDDXsDDXsp,p’-DDEp,p’-DDDp,p’[e-mail][e-mail]6800mg/L7.5mg/L2.3mg/L;pHRootexudatesoflow-molecularweightorganicacidsinwhitelupin(Lupinusalbus)andrape(Brassicanapus)atdifferentPlevelsGaoXiaojiangDepartmentofEnvironmentalScienceandEngineering,FudanUniversity,Shanghai,200433,[e-mail]gatedrootexudationoflow-molecularweightorganicacids(LMWOAs)inrootsofwhitelupin(Lupinusalbus)andrape(Brassicanapus)growninahydronicculturesystemunderdifferentPlevels(0,10,250µMP).UnderthelowPcondition,thepHofnutrientsolutioninwhitelupinclearlydecreased,butthepHinrapebecameincreasebycontraries.Ontheotherhand,severalPdeficiencyphenomenasuchasreducedshootgrowthandleafnecrosis,occurredduringthehydroponicculture.Thus,thetotalbiomassofwhitelupinandrapewasstronglyreducedunderPdeficientcondition(10and0Plevel),Besidetheobviousdifferentbiomassofeachplantshootandraperoot,thereisalmostnochangeforthebiomassofwhitelupinrootwhichispossiblebecauseofitsspecialclusterrootsystem.AnalysisresultsofLMWOAsshowthatthereisalargerincreaseofLMWOAconcentrationintherootofwhitelupinunderlowerPlevel,whichisabout25~28timesmorethanthatofwhitelupinat250µMPcondition.WhereasthetotalLMWOAamountofrootexudationofrapepresentnobigchangeunderdifferentPcondition.ThissuggestthatPdeficiencycanstronglyinducedrootexudationofLMWOAsinrootofwhitelupin,butthereisnoclearlyeffectontherootexudationofrape,whichisassociatedwithdifferentpHchangesofnutrientsolutionofwhitelupinandrapeplants.CitricacidandmalicacidwastwoofthemajorLMWOAsexudatedintherootofwhitelupininresponsetoPdeficiency.ThedistributionofLMWOAsinrootexudationofrapeisonlowerconcentrationcomparedwiththatofwhitelupin.TheresultsindicatethatPdefiency–inducedchemicalchange(pH,LMWOAs)inrhizosheresy[e-mail]8/(1h720h)Freundlichn1/48h/FreundlichKF8nKoc*(LAS),,,,,,[e-mail],(PAHs):(pyr)las0.2mg/l,3mg/lLASpyr11,[e-mail]1989~2003198961.66200347.039%43.2%33%:@fjnu.edu.cn2350007/H3PpH——DOpHL934-60~65%35~40%70~85%pH18-----0.9075.458mg/m2.d,1.1294.039mg/m2.d0.7942.046mg/[e-mail][e-mail][e-mail]10km7002070OMIS-I2002107OMIS515nm~577nm0.214~0.417LOWTRAN1,[e-mail]210087590GDP7%“”EKC1992~200329EKC“U”1978GDP13000/4546/“U”~[e-mail]230019118816PAHspHPAHsPAHsPAHs0~5km5~10km10~50kmPAHsPAHsPAHsCFD1,1,[e-mail]2CFDCFDCFDPHOENICSPOWERBUILDERVC++S[e-mail]123419861995200334.712.23kmRERIRERI,[e-mail].12345,,11,21710062,[e-mail]27100751989~200214,“”@nuigalway.ie23GIS16,51127-(Q-Q)Q-Q(Al,Ca,KNa)Q-QQ-QQ-Q27:(1000)Q-Q,100871,[e-mail]-MS30216EPAPAHsPAHs(TOC)16EPAPAHs24.83ng/g~8420.90ng/g,856.00ng/gPAHs2~3PAHs2~3PAHs32~3PAHs5~6PAHs65~6PAHs