不同農(nóng)業(yè)措施下東太湖水稻土N、P養(yǎng)分年流失比較.pdf

1、南京農(nóng)業(yè)大學(xué)碩士學(xué)位論文不同農(nóng)業(yè)措施下東太湖水稻土N、P養(yǎng)分年流失比較姓名：焦少俊申請學(xué)位級別：碩士專業(yè)：土壤學(xué)指導(dǎo)教師：潘根興20050601摘要ComparisonofAnnualLossofNandPfromPaddysoilnearEasternTaihuLakeunderDifferentAgriculturalTreatmentsABSTRACTStudyonthenitrogenandphosphoruslossonthe

2、HuangnituPaddysoilandQingziniPaddysoilregion，westtoTalhuLakeinrapeandriceseason，wasconducted，theexperimentrevealedthewayandthemainfactorsofNandPlOSSComparisononNandPlossandagriculturaleconomicprofitsprovidedabetterapproa

3、chtobalanceagriculturalgoal，environmentandeconomicalprofitsMainresultsofthethesisaresummarizedasfollows：IntheexperimentpotofaHuangnitu，intowhichaschemeoflongtermfertilizationtreatmentshasbeenputfor13years，analysisofmobil

4、eformsofphosphorusWasattached，TotalPcontentvalredinarrangeof03—059‘kg‘1underarangeoftotalPfertilizerinputof0—53kg／(hm2a)AsestimatedfromthetotalPpoolvaluesbymassbalanceprinciple，thesoilhadbeensubjecttowaterlossof2—8kgPha’

5、，withthatunderchemicalfertilizersonlybeingthebiggestTheratioofsolublePtothetotalwasinarangeofO2％04％withoutsignificantinfluencebythedifferentfertilizationschemesWhilechemicalfertilizerpluspigslurrymannreapplicationshadrem

6、arkablyenhancedtheresinPpoolby20—40mg。kg～PmobilizationWasnotobservedduetocombinedapplicationofchemicalfertilizersandstrawamendmemsdespitcoftheincreaseoftheSOMThemfore，Pwaterlossmighthavebeenactiveundercontinuouschemicalf

7、ertilizationaloneinagricultureofthisregionTeducethepresentprominentnonpointsourcepollutionofNandPinthisregion，itissuggestedthatchemicalfertilizersbeappliedincombinationwitllanappropriateamountofmanureorstrawreturnIntheex

8、perimentpotofHuangnitu，NlossandPlosswereabout1kg／hm2and003kg／hm2respectivelyunderthreetreatmentsinwinterandspringSurfacerunoffwaterdidnothappenuntilearlyspringLandwassubjectedtolittlelossofNandPinwintermainlyduetolowcont

9、entofsoilwaterdepiteofmuchoffertilizerandprecipitationbeingaddedinfieldsThefirstpronouncedlossofNcomesoutinearlyspring，significantlycorrespondedfortheaddedfertilizerinthemiddleMarchTheconcentrationofPWaSlowandlightlyvari