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1、應(yīng)用生態(tài)學(xué)報(bào)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(xué)特征術(shù)龔玉蓮楊中藝一(廣東第二師范學(xué)院生物系,應(yīng)用生態(tài)學(xué)實(shí)驗(yàn)室,廣州510303;中山大學(xué)生命科學(xué)學(xué)院,有害生物控制與資源利用國(guó)家重點(diǎn)實(shí)驗(yàn)室,廣州510275)摘要采用根箱試驗(yàn)研究蕹菜低Cd品種(QLQ)和高Cd品種(T308)的根際土壤化學(xué)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(jī)質(zhì)和水溶性有機(jī)質(zhì)(DOM)含量均高于T308.在污染土壤上,根際低分子量有機(jī)酸的組成與含量均存在品種間差異.T308根際檢測(cè)到乙酸、丙酸、檸檬酸和延胡索酸,而QLQ根際僅檢測(cè)到檸檬酸和延胡索酸.QLQ根際低分子量有機(jī)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(duì)Cd的吸收積累.關(guān)鍵詞蕹菜品種根際土壤化學(xué)特征低Cd積累文章編號(hào)1001—9332(2014)08—2377一O8中圖分類號(hào)Q14,Q89文獻(xiàn)標(biāo)識(shí)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