环境工程毕业论文1

《环境工程毕业论文1》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、侈.1*f本科生毕业设计（论文）题目：铅与酸雨对大豆植株环境与土木工程学院环境工程专业学号1003080114学生姓名毛春霞指导教师王丽红副教授二O—二年六月摘要本文采用水培法研究铅(Pb)与酸雨(AR)对大豆(Glycinemax)不同生育期生物量的复合影响。实验结果表明：(1)单一AR或Pb处理后，幼苗期大豆各生物量指标(叶片面积、单位叶鲜干重、茎鲜干重、根鲜干重)均下降，伤害随pH值降低或Pb浓度增加而增大，具有明显的剂量•效应关系。不同器官对AR或Pb的响应不同，呈现如下规律：根＞茎＞叶。AR或Pb对其它生育期(开花结荚期

2、和鼓粒期)大豆的规律与幼苗期相似，降低程度呈现如下规律：幼苗期＞开花结荚期〉鼓粒期。90mg-L-1Pb对开花结荚期大豆伤害最小。(2)pH3.0AR与Pb复合处理后，幼苗期大豆植株生物量最低，随着生育阶段向后推移，生长减缓，复合污染对大豆生物量的影响逐渐减小，尤其是AR与35mg・L"Pb复合处理组。pH3.5与Pb处理后，幼苗期大豆植株，茎、根生物量减少程度低于其它处理组，且其长势较好，而这种优势在其它生育期不明显。pH4.5与150mg-L'Pb复合处理下，幼苗期大豆自我保护机制失效。与对照相比，鼓粒期大豆植株结荚数明显下降

3、。复合处理组大豆根生物量指标降低程度＞茎＞叶。复合处理组大豆生物量降低程度高于单一AR和Pb处理组，鼓粒期差异相对较小。上述结果可为科学评价突发性AR与Pb污染对不同生育期植物的影响提供理论依据。关键词：酸南；铅；生物量；产量；鲜(干)重ABSTRACTThispaperisengagedinanexperimenttoexplorethecompoundeffectsoftheLead(Pb)andacidrain(AR)onbiomassofwaterculturedsoybean(Glycinemax)plantsindif

4、ferentgrowingperiods.Theresultsshowedthat:(1)WiththeARorPbBeatment,biomassindexes(leafarea,freshanddryweightofleaf,stemandroot)ofsoybeanseedlingswerealldecreased,andthelowerthepHofARwasorthehigherthePbconceiUrationwas,themoreseriousthedamagewas.Besides,theresponseofdi

5、fferentorganstotheARorPbtreatmentvaried,thedecreasedegreeorderofbiomasswas:root>stem>leaf.Itwassimilar(hat(hedamageordersofothergrowthstages(thebeginningpodstageandthebeginningseedstage)comparedwiththatoftheseedlingstage,butthedamagedegreeorderwas(heseedlingstageXhebe

6、ginningpodstage>lhebeginningseedstage.Inaddition、duringthebeginningpodstage、thedamageof9()mg・L‘Pbtreatmentwasthelowest・(2)InthepH3.0+Pbgroups,thebiomassofsoybeanseedlingswaslowest;asthesoybeanplantsgrewup,thegrowthrateofthesoybeanbecameslows;leadingtothelesseffectsoft

7、hecombinedpollutiononsoybean,especiallyinthepH3・0+low35mg・L」Pbgroup.ThedecreasedegreeofthebiomassofsoybeanseedlingsinthepH3.5+Pbgroupswaslowerthanthatinothergroups,whichwasnotobviousunderothergrowthstages・InthepH4・5+Pb(150mg・L“)group、thesoybeanseedlingscouldnotresistt

8、hehighPbpollutionbyitsownself-protection.Comparedwiththecontrol,thenumberofpodsunder(hebeginningseedstagewasdecreasedobvious