蕹菜不同鎘積累品種的根際土壤化學特征.pdf

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1、應(yīng)用生態(tài)學報2014年8月第25卷第8期ChineseJournalofAppliedEcology，Aug．2014，25(8)：2377-2384蕹菜不同鎘積累品種的根際土壤化學特征術(shù)龔玉蓮楊中藝一(廣東第二師范學院生物系，應(yīng)用生態(tài)學實驗室，廣州510303；中山大學生命科學學院，有害生物控制與資源利用國家重點實驗室，廣州510275)摘要采用根箱試驗研究蕹菜低Cd品種(QLQ)和高Cd品種(T308)的根際土壤化學特征．結(jié)果表明：QLQ根際DTPA·Cd含量顯著高于T308(P

2、5)，電導(dǎo)率(EC)的表現(xiàn)相反．QLQ根際有機質(zhì)和水溶性有機質(zhì)(DOM)含量均高于T308．在污染土壤上，根際低分子量有機酸的組成與含量均存在品種間差異．T308根際檢測到乙酸、丙酸、檸檬酸和延胡索酸，而QLQ根際僅檢測到檸檬酸和延胡索酸．QLQ根際低分子量有機酸總量(1．93nmol·gDM)極顯著低于T308(15．11nmol·gDM，P

3、能力較低，從而降低植株對Cd的吸收積累．關(guān)鍵詞蕹菜品種根際土壤化學特征低Cd積累文章編號1001—9332(2014)08—2377一O8中圖分類號Q14，Q89文獻標識碼AChemicalcharacteristicsoftherhizospheresoilofwaterspinachcultivarsdiferinginCdac．cumulation．GONGYu—lian，YANGZhong—yi(LaboratoryforAppliedEcology，DepartmentD廠Biology，GuangdongUniversityofEducation，

4、Guangzhou510303，China；StateKeyLaboratoryD廠Biocontrol，SchoolofSciences，SunYat—senUniversity，Guangzhou510275，China)．一Chin．App1．Eco1．，2014，25(8)：2377—2384．Abstract：Arhizoboxexperimentwasconductedtoinvestigatethechemicalcharacteristicsoftherhizospheresoilsoftwowaterspinachcuhivarsdiffer

5、inginCdaccumulation．QLQ(alow．Cdcuhi．var)andT308(ahigh．Cdcultivar)．TheresuhsshowedthatthediethylenetriaminepentacetateacidextractableCdfDTPA—Cd)concentrationintherhizos．pheresoilofQLQwassignificantlyhigherthanthatofT308(P<0．05)．pHandEhintherhizospheresoilofQLQweresignificantlyhighert

6、hanthoseofT308(P<0．05)，whileECwasopposite．Contentsoforganicmatteranddis—solvedorganicmatter(DOM)intherhizospheresoilofQLQwerebothhigherthanthoseofT308．Incontaminatedsoil。thecompositionandconcentrationoflowmolecularweightorganicacidsintherhizospherebetweenthetwocuhivarswerebothdifere

7、nt．Acetic，propionic，citricandfumaricacidsweredetectedintherhizospheresoilofT308．a(chǎn)ndonlycitricandfumaricacidsweredetectedinthatofQLQ．ThetotalconcentrationoflowmolecularweightorganicacidsintherhizospheresoilofQLQ(1．93nmol·gDM)waslowerthanthatofT308(15．11nmol·gDM)(P<0．01)．Comparedwitht

8、hehigh．Cdcuhivar(T3