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1、2015,34(4):627-632农业环境科学学报2015年4月JournalofAgro-EnvironmentScience海桐(Pittosporumtobira)对污染土壤中镉的耐受和吸收特征*曹霞,郭朝晖,肖细元,刘亚男,曾鹏(中南大学冶金与环境学院环境工程研究所,长沙410083)摘要:通过盆栽实验研究了海桐对土壤中镉(Cd)的耐受和吸收特征。动态取样研究结果表明,当土壤中Cd含量为9.6mg·kg-1时可对海桐生长产生促进作用,当Cd含量为24.6mg·kg-1时对海桐产生抑制作用;海桐对污染土壤中Cd有一定吸收能力,吸收量随土壤中Cd含量增加而增加。
2、培养154d后,与对照处理(土壤Cd含量为3.6mg·kg-1)相比,当土壤中Cd含量为9.6mg·kg-1时,海桐根、茎、叶干重,叶片中叶绿素a、叶绿素b和类胡萝卜素含量及丙二醛含量没有明显变化;当Cd含量达到24.6mg·kg-1时,海桐根、茎、叶干重分别降低了38.7%、5.2%和52.5%,叶片中叶绿素a、叶绿素b及类胡萝卜素含量分别是对照处理的71.3%、68.2%和75%,丙二醛含量为对照处理的1.52倍。研究表明,海桐可作为Cd污染土壤修复的备选植物,在修复土壤的同时改善环境景观。关键词:镉;景观植物;海桐;丙二醛含量;植物修复中图分类号:X53文献标志
3、码:A文章编号:1672-2043(2015)04-0627-06doi:10.11654/jaes.2015.04.003CadmiumToleranceandUptakeCharacteristicsinPittosporumtobirainContaminatedSoilCAOXia,GUOZhao-hui*,XIAOXi-yuan,LIUYa-nan,ZENGPeng(InstituteofEnvironmentalEngineering,SchoolofMetallurgyandEnvironment,CentralSouthUniversity,Chang
4、sha410083,China)Abstract:Apotexperimentwasconductedtostudythecadmium(Cd)toleranceanduptakecharacteristicsofPittosporumtobiragrowninCdcontaminatedsoil.ResultsshowedthatthegrowthofPittosporumtobirawasenhancedat9.6mgCd·kg-1soil,butreducedat24.6mgCd·kg-1soil.Pittosporumtobirashowedcapacityt
5、oaccumulateCd,andtheCdcontentinPittosporumtobiraincreasedwithsoilCdcon-tent.Comparedwiththecontrol(3.6mgCd·kg-1soil),nosignificantdifferenceswereobservedinroot,stemandleafdrybiomassandchlorophylla,chlorophyllb,carotenoidandmalondialdehyde(MDA)contentsofPittosporumtobiragrowninasoilwith9
6、.6mg·kg-1for154days.However,in24.6mg·kg-1soil,root,stemandleafdrybiomassreducedby38.7%,5.2%and52.5%overthecontrol,respectively,andthecontentsofchlorophylla,chlorophyllbandcarotenoidinleaveswere71.3%,68.2%and75%ofthecontrol,whereasleafMDAcontentwas152%ofthecontrol.ThisstudysuggeststhatPi
7、ttosporumtobiracanberegardedasacandidatetoremediateCdcontaminatedsoilswhileimprovingthescenesofcontaminatedenvironment.Keywords:cadmium;ornamentalplant;Pittosporumtobira;malondialdehydecontent;phytoremediation土壤中镉(Cd)主要来自于金属矿资源的采选冶重要的意义。目前,重金属污染土壤的修复方法主要[1]炼活动,污水灌溉,过度使用杀虫剂、农药、化