河北省農(nóng)田土壤磷素轉(zhuǎn)化、平衡與產(chǎn)量效應(yīng)

《河北省農(nóng)田土壤磷素轉(zhuǎn)化、平衡與產(chǎn)量效應(yīng)》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。

1、河北農(nóng)業(yè)大學(xué)博士學(xué)位論文河北省農(nóng)田土壤磷素轉(zhuǎn)化、平衡與產(chǎn)量效應(yīng)姓名：廖文華申請學(xué)位級(jí)別：博士專業(yè)：土壤學(xué)指導(dǎo)教師：劉建玲20120526而施用有機(jī)肥還可增加土壤有機(jī)磷含量，而且無論增施磷肥或有機(jī)肥，有效磷占全磷的比重都有掰增嫻。7、連續(xù)8年定位施用不同用量的磷肥和有機(jī)肥增加了土壤磷素的積累量，土壤Ca2。P、Ca8．P、AI。P、Fe．P含量均顯著增加，而O。P、Calo．P含量變化不顯蔫。隨著磷肥和有機(jī)囂跫用量的增加，Ca2．P、Ca8，P無釩磷麴比重在逐漸增加，酉Fe．P、O—P、Cal0．P在逐漸降低。積累磷的有效

2、性比重逐漸增加，增施磷肥Ca2．P、Ca8。P、A1．P、Fe。P含量每年分別增加0。3．6．6、10。5．42．7、3．0。13．1和1．6。4．7mg·kg-l。8、長期的有機(jī)。無機(jī)肥配施試驗(yàn)表明，連續(xù)3年過量施用磷肥或有機(jī)肥，±壤0．60cm±壤有效磷顯著增加，施腿5年后，60,--一80cm土壤有效磷顯蔫增加，藤且高量施用磷舅墨和有飆鼴80．100cm±層有效磷明顯增翻，說明隧著施勰時(shí)間的延長，積累的磷索逐漸向下遷移。9、定位監(jiān)測不霹土層菜地土壤有效磷的變化結(jié)果：土壤磷素主要在表層_翕集，隨著磷肥用量和棚齡的增加

3、，積累磷素逐漸向深層遷移，其中60。80cm土層積累磷素占0．80cm土體總積累量的6。7％．11．9％。關(guān)鍵詞：磷素；農(nóng)田；蔬菜；果樹；磷素累積；遷移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