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1、磷对不同玉米幼苗生长及根际磷素转化的影响第34卷第2期2011年3月河北农业大学JOURNALOFAGRICULTURALUNIVERSITYOFHEBEIVo1.34NO.2Mar.2011文章编号:1000—1573(2011)02—0013—05磷对不同玉米幼苗生长及根际磷素转化的影响沙晓晴,王西志,魏新燕,石二国.,彭正萍(1.河北农业大学资环学院,河北保定071001;2.河北农业大学林学院,河北保定071001;3.河北省阳原县农牧局,河北阳原075800)摘要:为利用玉米遗传潜力,节约磷矿资源,采用土壤盆栽和根袋相结合的方法,研究了高磷和低磷水平下2杂交玉米幼苗
2、生长,根系形态,根际和非根际土壤的生理特性和微生物数量变化.结果表明:与高磷相比,低磷降低2玉米的株高,总绿叶面积,地上部干重和磷含量,根干重和磷含量,增加了根冠比,降低土壤pH值,促进土壤磷酸酶活性,减少细菌数量和速效磷含量.与非根际土比,根际土的pH,磷酸酶活性和速效磷含量均降低,细菌和放线菌数量均增加,与供磷水平无关.玉米的生物量和磷含量均与根长,根表面积,根际土的pH,细菌数量间呈显着正相关,而与根干重无关,说明根系形态,土壤pH,细菌数量是影响土壤磷素转化和高效吸收的重要因素.与'冀单28'比,'蠡玉16'具有优势株高,总绿叶面积,植株干重和磷含量,较大的根长,根表
3、面积,根冠比和较多的细菌数量是该品种高效吸收磷的重要生理机制.关键词:磷;玉米;根系形态;转化;生理机制中图分类号:Sl54.2文献标志码:AEffectsofPhosphorusonplantgrowthandPconversioninrootrhizosphereofdifferentmaizeseedlingsSHAXiao—qing,WANGXi—zhi,WEIXin—yan,SHIEr—guo.,PENGZheng—ping(1.CollegeofResourcesandEnvironmentalSciences,AgriculturalUniversityofHe
4、bei,Baoding071001,China;2.CollegeofForestry,AgriculturalUniversityofHebei,Baoding071001,China;3.YangyuanAgricultureandAnimalHusbandryBureau,Yangyuan075800,China)Abstract:Tomakethemostofplantgeneticpotentialandsavephosphorus(P)mineralre—sources,theeffectsofhighandlowPlevelsonplantgrowth,root
5、morphology,soilphysiolog—icalcharactersinrhziosphereandnon—rhziosphereandnumbersofmicroorganismswerestudiedunderconditionsofpotculturewithroot—bag.Twomaize(ZeamaysL.)hybrids,'Liyu16'and'Jidan28',wereusedasthetestingmaterials.Theresultsshowedthatcomparedwiththehigh—Plevel,theheight,totalgree
6、nleafareas,shootandrootdryweightoftwomaizeinlowPlevelwerereduced,whiletheratioofroottoshootindryweightincreased.Moreover,soilpHwasreduced,thephosphataseactivityincreased,numbersofbacteriaandavailablePcon—tentlessened.Comparedwithnon-rhziosphere,pH,phosphataseactivityandavailablePcon—tentinr
7、hziospherewerereducedwhilenumbersofbacteriaandactinomyceteinereased.butnotrelatedwithPlevels.PlantbiomassandPcontentwerepositivelyrelatedwithrootlength,rootsurfaceareaandbacterianumber,buthadnocorrelationwithdryweightofroot.Therefore,收稿日期:2010—09～11基金项目:
