资源描述：
《2011年初级会计职称《初级经济法基础》试题(版3586321》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、农业环境科学学报2010,29(8):1520-1525JournalofAgro-EnvironmentScience不同改良剂对土壤－叶菜系统Cd迁移累积的调控作用1，22221郭利敏，艾绍英，唐明灯，李盟军，王朝辉（1．西北农林科技大学资源与环境学院，陕西杨凌712100；2．广东省农业科学院土壤肥料研究所广东省养分资源循环利用与耕地保育重点实验室，广州510640）摘要：为筛选适合在中轻度镉污染土壤上有效降低叶菜吸收镉的改良剂及用量，采用镉污染菜地土壤进行盆栽试验，研究不同用量的石灰、泥炭和碱渣对小白菜（BrassicachinensisL.
2、）生物量、镉吸收量，土壤pH及有效态镉含量的影响。结果表明，3种改良剂对小白菜生长均无显著的抑制作用；与不施改良剂的处理相比，石灰、泥炭显著抑制小白菜对镉的吸收，地上部镉含量与石灰和泥炭用量均呈显著负相关关系（R=-0.668、-0.785，P<0.05），碱渣对小白菜地上部镉含量的影响不显著，但显著增加根系镉含量；改良剂均显著提高土壤pH，但对DTPA-Cd影响不同，石灰显著降低DTPA-Cd，泥炭、碱渣均有增加DTPA-Cd含量的趋势；泥炭对土壤-小白菜系统Cd迁移的调控效果最佳，其最佳用量为20g·kg-1土，石灰次之，碱渣不适合。关键词：改良
3、剂；镉污染；化学固定；小白菜，镉含量中图分类号：X53文献标志码：A文章编号：1672-2043(2010)08-1520-06EffectofDifferentAmendmentsonTranslocationandAccumulationofCadmiumintheSoil-BrassicaChinesisSystemGUOLi-min1,2,AIShao-ying2,TANGMing-deng2,LIMeng-jun2,WANGZhao-hui1（1.CollegeofResourcesandEnvironmentalScience,North
4、westAgricultureandForestryUniversity,Yangling712100,China;2.InstituteofSoilandFertilizer,GuangdongAcademyofAgriculturalSciences,Guangzhou510640,China）Abstract：Cadmium（Cd）isoneofthemosttoxicandseriousenvironmentpollutingheavymetals.Theapplicationofamendmentsisanim－portantapproac
5、htoremediateCdcontaminatedsoils.Apotexperimentwasconductedtostudytheeffectsofthreeamendments（lime,peat,alkalislag）andtheirapplicationdosageonbiomassandCduptakeofBrassicachinesis,soilpH,andDTPA-extractedCdinaCdcontami－natedhorticulturalsoil,andtoselectthesuitableamendmentsforrem
6、ediatinglargeareasofCdcontaminatedfarmlandsoil.Theobtainedre－sultsindicatedthatapplicationsofthreeamendmentsdidnotinhibitthegrowthofBrassicachinesis.LimeandpeatinhibitedCduptakeofBrassicaChinesiscomparedwiththecontroltreatment,andtherewasapositivecorrelation（R=-0.668,-0.785,P<0
7、.05）betweenthein－hibitoryeffectandtheapplicationdosage.However,alkalislagshowednoobviouseffectsonshootCdconcentration,butsignificantlyin－creasedrootCdconcentrationofBrassiachinensis.ThreeamendmentsallimprovedsoilpH,buttheyhaddifferenteffectsontheDTPA-extractedCd.Limegreatlydecr
8、easedDTPA-extractedCdbutalkalislagandpeathadbothtended
