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ID:5294516
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页数:6页
时间:2017-12-07
《不同化肥品种对水稻铬吸收和分配的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、梁延鹏等不同化肥品种对水稻铬吸收和分配的影响不同化肥品种对水稻铬吸收和分配的影响*梁延鹏张学洪刘杰朱义年黄海涛(桂林理工大学环境科学与工程学院,广西矿冶与环境科学实验中心,广西桂林541004)摘要采用盆栽试验,研究在300mg/kg铬污染水稻土中分别施加氮肥(NH4C1、NH4NO3、Ca(NO3)2和CO(NH2)2)、钾肥(K2SO4和KC1)、磷肥(Ca(H2PO4)2和NaHzPO4)对水稻生长以及吸收和分配铬的影响。结果表明:(1)施肥处理虽然增加了水稻的产量,但也改变了水稻植株对土壤铬的吸收和积累。从总体上看,不同施肥处理对水稻植株总铬的影响达
2、到显著水平(P<0.05);氮肥、钾肥处理的水稻植株总铬比对照处理增加了1.7~72.9,磷肥处理的水稻植株总铬比对照处理降低了2.1~21.9。(2)不同施肥处理明显影响了铬在水稻植株内的分配与迁移。受试的氮肥、钾肥不仅促进水稻根部对铬的吸收和累积,也促进了铬向地上部分迁移;而磷肥则降低了水稻根部对铬的吸收和累积以及铬向地上部分迁移。(3)受试8种不同施肥处理均显著提高了水稻糙米总铬,施肥处理后水稻成熟期糙米总铬为1.1O~1.32mg/kg,均超过《食品中污染物限量》(GB2762-2005)中铬的限量(粮食1.0mg/kg),比对照处理提高了139.1
3、~187.0,增加了铬通过食物链威胁人体健康的风险。关键词水稻化肥铬吸收分配EffectsofdifferentfertilizersonCruptakeanddistributionbyriceLIANGYanpeng,ZHANGXuehong,LUJie,ZHUYinian,HUANGHaitao.(GuangxiScientificExperimentCenterofMining,MetallurgyandEnvironment,CollegeofEnvironmentalScienceandEngineering,GuilinUniversityof
4、Technology,GuilinGuangxi541004)Abstract:Potexperimentswereconductedtostudytheeffectsof8fertilizers(NH4Cl,NH4NO3,Ca(NO3)2,CO(NH2)2,Ca(H2PO4)2,Nail2PO4,K2SO4andKC1)onCruptakeanddistributionbyriceunderthe300mg/kgtreatment.Resultsshowedthatfertilizationtreatmentincreasedthebiomassofric
5、ebutchangedtheCruptakeandac—cumulationinrice.TheinfluenceoffertilizationontotalCrcontentinricewassignificant(6、untofCrinriceby2.1一21.9.FertilizersalsohadsignificanteffectonthedistributionandmigrationofCrinrice.Nitrogenandpotassiumfertilizerscouldnotonlyaccel—cratetheuptakeofCrintherootofricebutalsopromotetheCrmigrationfromroottoaerialpart.While,thephos—phatefertilizerdecreasedtheadsorptiona7、ndaccumulationofCrintheroot,simultaneously,themigrationofCrwasalsosuppressed.8fertilizersincreasedtheCrconcentrationofgrainby139.1一187.0,theconcentrationofCringrainundermaturitystagewas1.10—1.32mg/kgaftertestedfertilizerwereapplied,whichhadsignificantlyexceededthelimitCrvalue(1.0mg8、/kg)ofnationalfoodheavymet
6、untofCrinriceby2.1一21.9.FertilizersalsohadsignificanteffectonthedistributionandmigrationofCrinrice.Nitrogenandpotassiumfertilizerscouldnotonlyaccel—cratetheuptakeofCrintherootofricebutalsopromotetheCrmigrationfromroottoaerialpart.While,thephos—phatefertilizerdecreasedtheadsorptiona
7、ndaccumulationofCrintheroot,simultaneously,themigrationofCrwasalsosuppressed.8fertilizersincreasedtheCrconcentrationofgrainby139.1一187.0,theconcentrationofCringrainundermaturitystagewas1.10—1.32mg/kgaftertestedfertilizerwereapplied,whichhadsignificantlyexceededthelimitCrvalue(1.0mg
8、/kg)ofnationalfoodheavymet
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