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时间:2020-03-25
《磺胺间甲氧嘧啶在玉米根-土界面毒性研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(7):1268—1274JournalofAgro—EnvironmentScience磺胺间甲氧嘧啶在玉米根一土界面毒性研究李文静,金彩霞,张庚,郭焱,龙晓静,孙玉标(河南师范大学化学与环境科学学院河南省环境污染控制重点实验室,黄淮水环境与污染防治省部共建教育部重点实验室,河南新乡453007)摘要:通过根际袋土培试验,研究了磺胺间甲氧嘧啶(SMM)对玉米根际与非根际土壤酶活性和土壤呼吸强度的影响。结果表明,无论是否有根系作用,过氧化氢酶对磺胺间甲氧嘧啶胁迫的反应均不敏感。但在高浓度磺胺间甲氧嘧啶(50mg·kg。1)作用下,试验初期对脲酶有明
2、显的抑制作用,而在试验后期则表现出一定的促进作用,且在SMM胁迫下根际效应表现得更为明显。SMM胁迫下对根际与非根际土壤呼吸均有抑制作用,随浓度的增大,抑制作用越明显。且由于玉米根际作用,一定程度上缓解了SMM污染对根际微生物的毒害。一般情况下,根际土壤脲酶和过氧化氢酶活性及土壤呼吸强度均要大于非根际土壤,根际效应明显。关键词:磺胺间甲氧嘧啶;脲酶;过氧化氢酶;土壤呼吸;玉米;根际效应中图分类号:X592文献标志码:A文章编号:1672—2043(2010)07—1268—07TheEco-toxicologicalEffectofSulfamonomethoxineonCor
3、nRhizosphericandNon-rhizosphericSoilLIWen-jing,JINCai-xia,ZHANGGeng,GUOYan,LONGXiao-jing,SUNYu-biao(SchoolofChemistryandEnvironmentalSciences,HenanNormalUniversity,HenanKeyLaboratoryofEnvironmentalPollutionControl,KeyLaboratoryforYellowRiverandHuaiheRiverWaterEnvironmentalandPollutionControl
4、MinisitryofEducation,Xinxiang453007,China)Abstract:Theeffectsofsulfamonomethoxine(SMM)onsoilrespirationandactivitiesofureaseandcatalaseincornrhizosphereandnon—rhi—phere"gatedbyusingrhizoboxsimulatingrhizosphereenvironment.ThestudyshowedthatSMMhadsignificantlyeffectzospherewereinvestigatedbyu
5、singarhizoboxsimulatingrhizosphereenvironmenthestudyshowedthat5MMhadnotettect●thecatalase‘‘duringtheincubationperiodwhether‘effectedbynot.TheofsoilinhibitedonthecatalaseactivityduringthemostincubationperiodwhetheritettectedbyCOrnrootornotheactivityoisoilureasewasinhibitedat●thebeginningbutst
6、imulatedafterwardsinhighdosageconcentrationofSMM(50mg·kg。1).TheureaseactivitiesofrhizospheresoilpollutedbySMMwerehigherthanthecontrol,andhadasignificantrhizosphereeffects.SoilrespirationwasinhibitedbySMMbothinCOrnrhizo-sphericandnon-rhizosphericsoil,thehigheroftreatedconcentrationofSMM,thest
7、rongerinhibitionofsoilrespirationsuffered.SMMwaslesspoisonoustosoilrespirationwiththeeffectofcornrhizospheric.Meantime,theenzymeactivitiesandsoilrespirationinrhizosphericsoilwerehigherthanthatofnon—rhizospherea11along,therhizosphereeffectwassignifi
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