简介:Amini-plotfieldexperimentwasconductedonaloamyclayOxisoltocompareandevaluatePabsorptionandtransferinplantorgansandPmovementinsoilprofileatthreePapplicationdepthsunderthesoybean-citrusintercroppingversusthemonocultureusinga32Ptracertechnique.TotalPabsorption(Pt)bysoybeanandPaccumulation(Pa)insoybeanorgansdecreasedsignificantly(P<0.05)undertheintercroppingincontrasttothemonoculture.Withintercropping,when32Pwasappliedintopsoil(15cmsoillayer),total32Pabsorption(32Pt)insoybeanswassignificantlylower(P<0.05),butwhen32Pwasappliedtodeepersoillayers(35or55cmsoillayer),32Ptinsoybeanswassignificantlygreater(P<0.05).ThepercentageofPinleavestototalP(Pa/Pt)and32Pinleavestototal32P(32Pa/32Pt)forsoybeanwere(?)25%andthoseofroot(?)12%.WhenPwasappliedintopsoiland55cmsoillayer,nosignificantdifferenceswerefoundbetweenintercroppingandmonocultureforPtofcitrus.ThePabsorbedbycitruswastransferredrapidlytothegrowingorgansofabovegroundduringtheexperiment,andthespeedoftransferringtothegrowingorgansslowedwhenPwasappliedtothedeepersoillayers.Inintercropping,Pmobilitywasheightenedinthesoilprofile,andPindeepersoillayersmoveduptotopsoilmorerapidly.
简介:Coupledtransferofsoilwaterandheatinclosedcolumnsofhomogeneousredsoilwasstudiedunderlaboratoryconditions.Acoupledmodelwasconstructedusingsoilphysicaltheory,empiricalequationsandexperimentaldatatopredictthecoupledtransfer.Theresultsshowthattransportofsoilwaterwasaffectedbytemperaaturegradient,andthelargestnetwatertransportwasfoundinthesoilcolumnwithinitialwatercontentof0.148m^3m^-3,Atthesametime,temperaturechangeswiththetransportofsoilwaterwasinanonlinearshapeasheatparameterswrefunctionofwatercontent,andthechangesoftemperaturewerepositivelycorrelatedwiththenetamountofwatertransported.Numericalmodellingresultsshowthatthepredictedvaluesoftemperaturedistributionwereclosetotheobservedvalues,whilethepredictedvaluesofwatercontentexhibitedlimiteddeviationatbothendsofthesoilcolumnduetotheslighttemperaturechangesatbothends.ItWASindicatedthatthemodelproposedherewasapplicable.
简介:因为快速的都市化和工业化,在仙子城市的区域的蔬菜地在中国收到大量体外的重金属。在30的Cu,Zn,和Pb的集中玷污样品和32件蔬菜样品,在中国的南部的江苏省从30个不同地点收集了,被测量,他们到蔬菜的从土壤的转移被决定。结果证明土壤样品有pH的宽范围(4.257.85)并且电的电导率(EC)(0.243.42dSm?1)。在土壤样品之中,有四件土壤样品和比那些在中国土壤指定环境优秀标准II包含更高的Zn集中的二件土壤样品,包含更高的Cu。然而,没有蔬菜样品被发现包含Cu或Zn的高水平。相反,一件蔬菜样品包含了0.243mgPbkg?1FW,在中国食物卫生标准上面,而相应土壤Pb集中比汉语低,玷污环境优秀标准II。所有蔬菜样品的Cu的转移系数超过了建议系数范围,暗示体外的Cu有到蔬菜的高活动性和简历可获得性。在可引出的土壤之间没有重要关联有四种提炼之物和土壤pH的重金属集中,EC,在蔬菜和土壤的重金属集中除了土壤pH与1.0摩尔L与可引出的土壤Cu,Zn,和Pb集中相关很好之外?1NH4NO3。而且,diethylenetriaminepentaacetic酸(DTPA)抽取方法比另外的三个方法使用是从土壤pH和EC的土壤独立人士提取重金属的一个更有效的方法。
简介:三个米饭变化,Zhonghan3,Shanyou63和Aizizhan,当在检测微分活跃甲基的材料骑车并且响应干旱应力转移相关基因表示,被使用。实验被在干旱的条件下面的微分显示器技术与10%PEG6000答案模仿了的基因薄片和mRNA执行。结果显示甲基周期能在Zhonghan3和Shanyou63的叶子被激活,但是在干旱应力下面在Aizizhan的叶子禁止了。而且,干旱应力能导致很多methyltransferase基因的表示,特别Rubisco蛋白质methylation的抄写联系了基因,它是有益的因为Rubisco蛋白质氧化和降级的预防,和干旱应力能禁止DNAmethyltransferase基因和histonemethyltransferase基因的抄写。这结果证实活跃甲基骑车并且转移相关基因涉及米饭干旱抵抗。