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1、磷對(duì)不同玉米幼苗生長(zhǎng)及根際磷素轉(zhuǎn)化的影響第34卷第2期2011年3月河北農(nóng)業(yè)大學(xué)JOURNALOFAGRICULTURALUNIVERSITYOFHEBEIVo1.34NO.2Mar.2011文章編號(hào):1000—1573(2011)02—0013—05磷對(duì)不同玉米幼苗生長(zhǎng)及根際磷素轉(zhuǎn)化的影響沙曉晴,王西志,魏新燕,石二國(guó).,彭正萍(1.河北農(nóng)業(yè)大學(xué)資環(huán)學(xué)院,河北保定071001;2.河北農(nóng)業(yè)大學(xué)林學(xué)院,河北保定071001;3.河北省陽(yáng)原縣農(nóng)牧局,河北陽(yáng)原075800)摘要:為利用玉米遺傳潛力,節(jié)約磷礦資源,采用土壤盆栽和根袋相結(jié)合的方法,研究了高磷和低磷水平下2雜交玉米幼苗
2、生長(zhǎng),根系形態(tài),根際和非根際土壤的生理特性和微生物數(shù)量變化.結(jié)果表明:與高磷相比,低磷降低2玉米的株高,總綠葉面積,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,促進(jìn)土壤磷酸酶活性,減少細(xì)菌數(shù)量和速效磷含量.與非根際土比,根際土的pH,磷酸酶活性和速效磷含量均降低,細(xì)菌和放線菌數(shù)量均增加,與供磷水平無(wú)關(guān).玉米的生物量和磷含量均與根長(zhǎng),根表面積,根際土的pH,細(xì)菌數(shù)量間呈顯著正相關(guān),而與根干重?zé)o關(guān),說(shuō)明根系形態(tài),土壤pH,細(xì)菌數(shù)量是影響土壤磷素轉(zhuǎn)化和高效吸收的重要因素.與'冀單28'比,'蠡玉16'具有優(yōu)勢(shì)株高,總綠葉面積,植株干重和磷含量,較大的根長(zhǎng),根表
3、面積,根冠比和較多的細(xì)菌數(shù)量是該品種高效吸收磷的重要生理機(jī)制.關(guān)鍵詞:磷;玉米;根系形態(tài);轉(zhuǎn)化;生理機(jī)制中圖分類號(hào):Sl54.2文獻(xiàn)標(biāo)志碼: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基金項(xiàng)目:
