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ID:32904002
大小:8.35 MB
页数:123页
时间:2019-02-17
《河北省农田土壤磷素转化、平衡与产量效应》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、河北农业大学博士学位论文河北省农田土壤磷素转化、平衡与产量效应姓名:廖文华申请学位级别:博士专业:土壤学指导教师:刘建玲20120526而施用有机肥还可增加土壤有机磷含量,而且无论增施磷肥或有机肥,有效磷占全磷的比重都有掰增娴。7、连续8年定位施用不同用量的磷肥和有机肥增加了土壤磷素的积累量,土壤Ca2。P、Ca8.P、AI。P、Fe.P含量均显著增加,而O。P、Calo.P含量变化不显蔫。随着磷肥和有机嚣跫用量的增加,Ca2.P、Ca8,P无钒磷麴比重在逐渐增加,酉Fe.P、O—P、Cal0.P在逐渐降低。积累磷的有效
2、性比重逐渐增加,增施磷肥Ca2.P、Ca8。P、A1.P、Fe。P含量每年分别增加0。3.6.6、10。5.42.7、3.0。13.1和1.6。4.7mg·kg-l。8、长期的有机。无机肥配施试验表明,连续3年过量施用磷肥或有机肥,±壤0.60cm±壤有效磷显著增加,施腿5年后,60,--一80cm土壤有效磷显蔫增加,藤且高量施用磷舅墨和有飙鼹80.100cm±层有效磷明显增翻,说明隧著施勰时间的延长,积累的磷索逐渐向下迁移。9、定位监测不霹土层菜地土壤有效磷的变化结果:土壤磷素主要在表层_翕集,随着磷肥用量和棚龄的增加
3、,积累磷素逐渐向深层迁移,其中60。80cm土层积累磷素占0.80cm土体总积累量的6。7%.11.9%。关键词:磷素;农田;蔬菜;果树;磷素累积;迁移Transformation,BalanceandYieldResponseofSoilPhosphorusintheArableLandsinHebeiProvinceAuthor:UA0WrenhuaMajor:SoilscienceAdvisior:Prof.UUJianlingAbstractSafemanagementpracticesonthesoilphos
4、phorus(P)hasbeenhighlyconcernedbythepublicduetotheconsecutiveaccumulation,declingyieldresponseandincreasingenvironmentalriskcausedbytheexcessiveapplicationofPfertilizersintheagricultureinChina.Inthisstudy,theinput,balanceandspatio-tempeoralvariationofphosphorusin
5、thecontinuumoffertilizer-plant—soilduringthelast30yearswereinvestigatedfromliteratureatmacroscale,andthetransformationandavailabilityoftheaccumulatedPinsoilweremonitoredinsituduringlong—termexperiment.Theresultsobtainedatmacroandplotlevelwerecombinedtoindicatethe
6、changesoftotalPapplicationinHebeiprovinceaswellasthePbalance,yieldresponsetotheapplicationrateandformsofPfertilizers,transformationandmovementinthesoilprofileforthegrain,vegetableandorchardproductionsysteminHebei.Themainresultsareasfollowing:1.Itwasfoundthatthefa
7、stincreaseperiodsofPfertilizationrateinHebeiprovinceduring1980-1985and1990-1995wereobserved,wheretheaverageannualincreaseratewas14%;meanwhile,thetotalconsumptionofcompoundPfertilizersreachedupto894木103tonesandtherespectivecontributiontothetotalPconsumptionincreas
8、edfrom10%2.AnalysisofPbalancebasedontheinput—outputindicatedthatthesoilPstatusofwinterwheat—summermaizerotationsystemswerecharacterizedwithdepletionperiod(1949
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