简介：TwoecotypesofElsholtzia,ElsholtziasplendensandE.Argyi,aredominantplantsgrowingonCuandPb-Znsmelters,respectively.SamplesofthetwoecotypesandthecorrespondingsoilsfromfieldsofacopperminingareaandaPb-ZnminingareaofZhejiangProvince,China,wereanalyzedtoinvestigateCuorZntoleranceofthesetwoecotypes.EffectsofnineCulevels(0,5,10,20,40,80,160,240and320mgCuL-1asCuSO4@SH20)ongrowthanduptake,translocationandaccumulationofCuinthesetwoecotypeswereexaminedinasolutioncultureexperiment.Theexperimentalresultsshowedthatdryweights(DW)ofshootsandrootsweredepressed,andgrowthofE.SplendenswaslessdepressedthanthatofE.Argyiwhentreatedwith≥5mgCuL-1.ConcentrationsofCuinshootsofE.SplendensandE.Argyiexceeded1000mgkg-1DWat≥40mgCuL-x.ThemaximumCuaccumulatedintheshootsofGu-treatedE.SplendensandE.Argyireached101and142μgplant-1.Furthermore,analysisofplantsamplesfromthefieldsshowedthatthesetwoecotypescantolerantexcessheavymetalsandproducedhighdrymatter,andE.Splendenscanaccumulate11.7mgCuplant-1grownontheCusmelter.Therefore,E.SplendensandE.Argyicouldbegoodplantsforphytoremediation.

简介：Carbonofhumusacids(HSAC)anddissolvedorganiccarbon(DOC)arethemostactiveformsofsoilorganiccarbon(SOC)andplayanimportantroleinglobalcarbonrecycling.WeinvestigatedtheconcentrationsofHSAC,water-solubleorganiccarbon(WSOC),hotwater-extractableorganiccarbon(HWOC)andSOCinsoilsunderdifferentvegetationtypesoffourcopperminetailingssiteswithdifferingvegetationsuccessiontimeperiodsinTongling,China.TheconcentrationsofHSAC,WSOC,HWOCandSOCincreasedwithvegetationsuccession.WSOCconcentrationincreasedwiththeaccumulationofSOCinthetailings,andalinearlypositivecorrelationexistedbetweentheconcentrationsofHSACandSOCinthetailings.However,thepercentagesofHSACandDOCintheSOCdecreasedduringvegetationsuccession.TherateofSOCaccumulationwashigherwhenthesuccessiontimewaslongerthan20years,whereasthespeedsofsoilorganicmatter(SOM)decompositionandhumificationwereslow,andtheconcentrationsofHSACandDOCincreasedslowlyinthetailings.Thepercentageofcarbonofhumicacid(HAC)inHSACincreasedwithvegetationsuccession,andthevaluesofhumificationindex(HI),HAC/carbonoffulvicacid,alsoincreasedwiththeaccumulationofHSACandSOCinsoilsofthetailingssites.However,theHIvalueintheeachofthetailingswaslessthan0.50.ThehumificationrateofSOMwaslowerthantheaccumulationrateofSOM,andthelevelofsoilfertilitywasstillverylowinthetailingsevenafter40yearsofnaturalrestoration.