简介：Background:Soilorganiccarbon(SOC)isalargereservoirofterrestrialcarbon(C);itconsistsofdifferentfractionsofvaryingcomplexityandstability.PartitioningSOCintodifferentpoolsofdecomposabilityhelpbetterpredictthetrendofchangesinSOCdynamicsunderclimatechange.InformationonhowphysicalfractionsandchemicalstructuresofSOCarerelatedtoclimateandvegetationtypesisessentialforspatialmodelingofSOCprocessesandresponsestoglobalchangefactors.Method:Soilsampleswerecolectedfrommultiplerepresentativeforestsitesofthreecontrastingclimaticzones(i.e.cooltemperate,warmtemperate,andsubtropical)ineasternChina.MeasurementsweremadeonSOCcontentsandphysicalfractionsofthe0–20cmsoillayer,andthechemicalcompositionofSOCofthe0–5cmsoillayer,alongwithmeasurementsandcompilationofthebasicsiteandforeststandvariables.Thelong-termeffectsoftemperature,litterinputs,soilcharacteristicsandvegetationtypeontheSOCcontentsandfactionswereexaminedbymeansof"spacefortimesubstitution"approachandstatisticalanalysis.Result:Meanannualtemperature(MAT)variedfrom2.1℃atthecooltemperatesitesto20.8℃atthesubtropicalsites.TotalSOCofthe0–20cmsoillayerdecreasedwithincreasingMAT,rangingfrom89.2g·kg^-1incooltemperateforeststo57.7g·kg^-1insubtropicalforests,atanaveragerateof1.87%reductioninSOCwitha1℃increaseinMAT.WithincreasingMAT,theproportionsofaromaticCandphenolicCdisplayedatendencyofdecreases,whereastheproportionofalkylCandA/O-Avalue(theratioofalkylCtothesumofO-alkylCandacetalC)displayedatendencyofincreases.Overall,therewerenosignificantchangeswithMATandforesttypeineitherthephysicalfractionsorthechemicalcomposition.BasedontherelationshipbetweentheSOCcontentandMAT,weestimatethatSOCinthetop20soillayerofforestspotentiallycontribute6.58–26.3PgCgloballytotheat

简介：Effectsoforganicfertilizersandeffectivemicrobesonlefwaterretentionofsweetcorn(ZeamaysL.cv.Honey-Bantam)werestudied.Sweetcornsweregrownwithorganicorchemicalfertilzerswithorwithouteffectivemicrobes(EM).Awaterretentionurvewasobtainedbydryingtheexcisedleavesunderalightof500μmol(m^2.s)^-1,Thecureshowstwodistinctphases.Theinitialsteepslopeindicatesthewaterlossspeedbystomataltranspiration(Est)andthegentleslopeofthesecondphaseindicateswaterlossspeedbycuticulartranspiration(Ecu).BothEstandEcuwerelowerforleavesofplantsgrownwithorganicmaterialsthanfrothoewithchemicalfertilizers.AdditionofEMtobothorganicandchemicalfertilizersdecreasedEstbutshowednoeffectonEcu.Thewaterretentionabilityoftheexcisedleaveswasproportionaltopho-tosyntheticmaintenanceabilityundersoilwaterdeficitconditionsaswellasthesolteconcentrationinleaves,TheresultssuggestedthatorganicfertilizationandEMappicationincreasedwaterstressresistancebothunderinsituconditionsandinexcisedleavesofsweetcornplants.

简介：Along-termexperimentbeginningin1981inJinxianCountyofJiangxiProvince,subtropicalChina,wasconductedinapaddyfieldunderadoublericecroppingsystemwithfourdifferentfertilizationregimes,including1)nofertilizerascontrol(CK),2)balancedchemicalN,P,andKfertilizers(NPK),3)organicmanureusingmilkvetchandpigmanureintheearlyandlatericegrowingseason,respectively(OM),and4)balancedchemicalfertilizerscombinedwithorganicmanure(NPKM).Samples(0-17cm)ofthepaddyfieldsoil,whichwasderivedfromQuaternaryredclay,werecollectedafterthelatericeharvestinNovember2003fordeterminationoftotalorganiccarbon(TOC)andtotalnitrogen(TN)andfractionsoforganicCandN.ResultsshowedthatTOCandTNintheNPKMandOMtreatmentsweresignificantlyhigherthanthoseinothertwotreatments(CKandNPK).ApplicationoforganicmanurewithorwithoutchemicalfertilizerssignificantlyincreasedthecontentsofallfractionsoforganicCandN,whereaschemicalfertilizerapplicationonlyincreasedthecontentsofoccludedparticulateorganicC(oPOC)andaminoacidN.Inaddition,applicationoforganicmanuresignificantlyenhancedtheproportionsoffreeparticulateorganiccarbon(fPOC)andoPOCintotalC,andthoseofaminosugarNandaminoacidN(P<0.01)intotalN.Incontrast,chemicalfertilizerapplicationonlyincreasedtheproportionsofoPOCandaminoacidN(P<0.05).TherewerenosignificantdifferencesineithercontentsorproportionsofsoilorganicCandorganicNfractionsbetweentheNPKMandOMtreatments.TheseindicatedthatorganicmanureapplicationwithorwithoutchemicalfertilizersplayedthemostsignificantroleinenhancingsoilorganicCandNquantityandqualityinthepaddyfieldstudied.

简介：Thirteensedimentcoresamples(0-10cm)weretakenfromthesevenlakesinthemiddleandlowerreachesoftheYangtzeRivertodeterminethecontentsanddistributionsoforganicphosphorus(P)fractionsinthesedimentsoftheshallowlakesinthearea.TheorganicPfractionsinthesedimentswereintheorderofmoderatelylabileorganicP(MLOP)>moderatelyresistantorganicP(MROP)>highlyresistantorganicP(HROP)>labileorganicP(LOP),withaverageproportionalratiosof13.2:2.8:1.3:1.0.LOP,MLOP,andMROPweresignificantlyrelatedtothecontentsoftotalorganiccarbon(TOC),water-solubleP(WSP),algal-availableP(AAP),NaHCO3-extractableP(Olsen-P),totalP(TP),organicP(OP),andinorganicP(IP).However,HROPwassignificantlyrelatedtoOPandweaklycorrelatedwithTOC,WSP,AAP,Olsen-P,TPorIP.ThissuggestedthatorganicP,especiallyLOPandMLOPinsediments,deservedevengreaterattentionthanIPinregardstolakeeutrophication.IntermsoforganicP,sedimentsweremorehazardousthansoilsinlakeeutrophication.AlthoughOPconcentrationswerehigherinmoderatelypollutedsedimentthanthoseinheavilypollutedsediment,LOPandMLOPwerehigherintheheavilypollutedsediment,whichindicatedthatheavilypollutedsedimentwasmorehazardousthanmoderatelypollutedsedimentinlakeeutrophication.

简介：Low-molecular-weight(LMW)organicacidsexistwidelyinsoilsandhavebeenimplicatedinmanysoilprocesses.TheobjectiveofthepresentpaperwastoevaluateeffectoftwoLMWorganicacids,citricacidandoxalicacid,onCl-adsorptionbythreevariablechargesoils,alatosol,alateriticredsoilandaredsoil,usingabatchmethod.TheresultsshowedthatthepresenceofcitricacidandoxalicacidledtoadecreaseinCl-adsorptionwithlargerdecreasesforcitricacid.AmongthedifferentsoilsGl-adsorptioninthelateriticredsoilandtheredsoilwasmoreaffectedbyboththeLMWorganicacidsthanthatinthelatosol.

简介：Background:Thelargepotentialofthesoilorganiccarbon(SOC)pooltosequesterCO2fromtheatmospherecouldgreatlyamelioratetheeffectoffutureclimatechange.However,thequantityofcarbonstoredinterrestrialsoilslargelydependsuponthemagnitudeofSOCmineralization.SOCmineralizationconstitutesanimportantpartofthecarboncycle,andisdrivenbymanybiophysicalvariables,suchastemperatureandmoisture.Methods:Soilsamplesofapineforest,anoakforest,andapineandoakmixedforestwereincubatedfor387daysunderconditionswithsixtemperaturesettings(5°C,10°C,15°C,20°C,25°C,30°C)andthreelevelsofsoilmoisturecontent(SMC,30%,60%,90%).TheinstantaneousrateofmineralizedSOCwasperiodicallyandautomaticallymeasuredusingaLi-CorCO2analyzer.BasedonthemeasuredamountofmineralizedSOC,carbonfractionswereestimatedseparatelyviafirst-orderkineticone-andtwo-compartmentmodels.Results:Duringthe387dayincubationexperiment,accumulativemineralizedcarbonrangedfrom22.89mgcarbon(C)·g-1SOCat30°Cand30%SMCforthemixedforestto109.20mgC·g-1SOCat15°Cand90%SMCfortheoakforest.Mineralizedrecalcitrantcarbonvariedfrom18.48mgC·g-1SOCat30°Cand30%SMCforthemixedforestto104.98mgC·g-1SOCat15°Cand90%SMCfortheoakforest,andcontributedatleast80%tototalmineralizedcarbon.Conclusions:Basedontheresultsofthisexperiment,thesoilorganicmatterofthepurebroadleavedforestismorevulnerabletosoilmicrobialdegradationinnorthernChina;mostoftheamountofthemineralizedSOCderivedfromtherecalcitrantcarbonpool.Labilecarbonfractionconstitutesonaverage0.4%ofSOCacrossthethreeforesttypesandwasrapidlydigestedbysoilmicrobesintheearlyincubationstage.SOCmineralizationmarkedlyincreasedwithsoilmoisturecontent,andcorrelatedparabolicallytotemperaturewiththehighestvalueat15°C.Nosignificantinteractionwasdetectedamongthese

简介：Fieldexperimentswereconductedtoassesstheimpactofvariousorganicsources,inorganicnitrogen(N)andthedifferentcombinationsofinorganicN(urea)+organicsourceontheyieldcomponents(YC)andgrainyield(GY)ofhybridrice(OryzasativaL.,Pukhraj)underrice-wheatsystem.TheexperimentswereconductedatBatkhela(Malakand),NorthwesternPakistan,in2011and2012.OurresultsrevealedthatYCandGYrankedfirstforthehybridricewhenappliedwithsoleinorganicN(urea),followedbytheapplicationofNinmixture(urea+organicsources),whilethecontrolplots(noNapplied)rankedinthebottom.Amongthesixorganicsources(threeanimalmanures:poultry,sheepandcattle;threecropresidues:onion,berseemandwheat),applicationofNintheformofpoultrymanurewassuperiorintermsofhigherYCandGY.Whenapplying120kg/hm2Nsource,75%Nfromurea+25%NfromorganicsourceresultedinhigherYCandGYin2011,whileapplying50%Nfromurea+50%NfromorganicsourcescausedhigherYCandGYin2012.Therefore,thecombinedapplicationofNsourcesintheformofurea+organicsourcecanproducegoodperformancesintermsofhigherYCandGYofriceunderrice-wheatcroppingsystem.

简介：Thepresentstudywasanefforttounderstandtheamountoflitterfallanditssubsequentdecompositionandquantifythereleaseofavailablenutrientsandsoilphysicochemicalcharacteristicsinplantationsoffourforesttreespecies(Lagerstroemiaparviflora,Tectonagrandis,ShorearobustaandMicheliachampaca)intheChilapattaReserveForestoftheCoochBeharWildlifeDivisionintheTeraizoneofWestBengal,India.Themostlitter(5.61Mgha-1)wasproducedbyT.grandisplantationandtheleast(4.72Mgha-1)byL.parviflora.Thematerialturnoverratetothesoilthroughdecompositionfromtotallitterwasfastestduringthefirstquarteroftheyearandsubsequentlydecreasedduringthenexttwoquarters.Thematerialturnoverratewasonly1year,whichindicatesthatmorethan90%ofthetotallitterproduceddecomposedwithinayear.Theavailableprimarynutrientcontentinlittervariedacrossthefourplantationsovertheyear.Theplantationsgenerallydidnotsignificantlyinfluencethesoilphysicalcharacteristicsbutdidsignificantlyinfluencetheavailabilityofprimarynutrientsandorganiccarbonattwodepths(1-15and16-30cm)overtheyear.Theavailabilityofsoilprimarynutrientsinthefourplantationsalsoincreasedgraduallyfromthefirstquarteroftheyeartothethirdquarterandthendecreasedduringthelastquartertothesamelevelasinthefirstquarteroftheyearatbothdepths.Theavailabilityforsoilorganiccarbonintheplantationsfollowedasimilatrend.Theamountoflitterproducedandthematerialturnoverinthesoilinthedifferentplantationsdiffered,influencingthenutrientavailabilityandorganiccarbonattheplantations.TheamountofsoilorganiccarbonwashighestforT.grandis(2.52Mgha-1)andlowestforL.parviflora(2.12Mgha-1).Litteristhesourceofsoilorganicmatter,andmorethelitterthatisproducedbytheplantations,thehigherwillbethecontentandamountofsoilorganiccarbonintheplantation.

简介：Thesystemofriceintensification(SRI)isaproductionsystemthatinvolvestheadoptionofcertainchangesinmanagementpracticesforricecultivationthatcreateabettergrowingenvironmentforthecrop.Thissystemwascomparedwithconventionalpracticesandassessedunderorganicandinorganicmanagement.SRIpracticesshowedsignificantresponseinrootnumber,numberofeffectivetillersperhill,daystofloweringandharvestindex.Inaddition,SRIwasfoundeffectiveinminimizingpestanddiseasein...

简介：在南部的中国的大米小麦旋转被经常的排干洪水的水政体和重氮(N)授精描绘。有进溶解的器官的氮的行为的研究的实质的缺乏(穿上)在强烈地管理的agroecosystem。在situ地实验3年的A被进行决定穿上沥滤并且它在6个连续大米/小麦季节由授精，灌溉和降水影响了的季节、每年的变化。在常规N实践下面(300kgN哈为米饭和200kgN的−1哈为小麦的−1)，季节的一般水准在leachate(100厘米土壤深度)穿上集中因为三个米饭和小麦季节是0.6–1.1和0.1–2.3mgNL−1,分别地。累积穿上沥滤被估计是1.1–2.3kgN哈为米饭季节和0.01–1.3kgN的−1哈为小麦季节的−1，与1.1–3.6kg的一个年度总数N哈−1。在大米季节，N化肥有小效果(P>0.05)在上穿上沥滤；降水和灌溉进口了3.6–9.1kgN哈−1穿上，它可以因此隐藏授精效果在上穿上。在小麦季节，N授精有积极效果(P<0.01)在上穿上。不过，这提升效果被可变降水强烈影响，它也带了1.8–2.9kgN哈−1穿上进地。尽管有到使用的化学N和大变化的一个很小的比例，走水路驾驶政体，穿上沥滤必然与另外的自然生态系统相比由于它的相对更大的数量在大米小麦旋转涉及综合的地N预算。

简介：Afieldexperimentwasconductedfortwoconsecutiveyearsinafarmer'sfieldatHajiMoraVillage,DeraIsmailKhan(D.I.Khan)intheNorthwestFrontierProvince(NWFP)ofPakistantocomparevariousmanagementpractices,suchastheeffectofvariousorganicmanuresandgypsuminarice-wheatcroppingsystemonasaline-sodicEntisol(Zindanisoilseries).Thetreatmentsconsistedof1)acontrol(rice-wheat),2)gypsum,3)farmyardmanure(FYM),4)berseem(TrifoliumalexandrinumL.)asgreenmanure(GM),and5)dhancha(Sesbaniasp.)asGM.Alltreatmentsincreasedyieldsofbothriceandwheatsignificantly(P＜0.01)overthecontrol,withthegreenmanuretreatmentsprovingmoreeconomicalthantheothers;whiletheydecreasedpH,electricalconductivity(EC),andsodiumadsorptionratio(SAR)ofthesoil.Saturationpercentageandavailablewaterofthesoilwereraisedforalltreatmentsduetoanincreaseinorganicmattercontentofthesoil.

简介：Changesofsoilorganicnitrogenformsandsoilnitrogensupplyundercontinuousricecroppingsystemwereinvestigatedinalong-termfertilizationexperimentinJinhua,ZhejiangProvince,China.ThefertilizertreatmentsincludedcombinationofP-K,N-K,N-P,andN-P-Kaswellasthecontrol.Aftersixyearsofcontinuousdouble-ricecropping,totalsoilNandhydrolysableNcontentsremainedstableinplotswithNtreatments,whilethehydrolysableNcontentsweresubstantiallyreducedinthoseplotswithoutNapplication.Comparedtotheunbalancedfertilizationtreatments,PandKincreasedthepercentageofhydrolysableammoniumNinthetotalsoilNwiththebalancedapplicationofN,andalsomaintainedhigherricegrainyieldsandnitrogenuptake.GrainyieldwaspositivelycorrelatedwithtotalNuptake(r=0.875**),hydrolysableN(r=0.608**),hydrolysableammoniumN(r=0.560**)andthehydrolysableunknownN(r=0.417**).TotalNuptakewaspositivelycorrelatedwithhydrolysableN(r=0.608**),hydrolysableammoniumN(r=0.440**)andhydrolysableunknownN(r=0.431**).Soilnutrientdepletionand/orunbalancedfertilizationtoricecropreducedNcontentinsoilmicrobialbiomass,andthereforeincreasedC/Nratio,suggestinganegativeeffectonthetotalmicrobialbiomassinthesoil.

简介：因为它的高收益潜力，到边缘的地点的改编，和忍耐，Switchgrass(PanicumvirgatumL.)作为持续bioenergy庄稼被建议了到水和滋养的限制。生物资源精力庄稼生产的潜在的效果的更好的理解在土壤上练习生物性质，有机物动力学对它的生产批评。我们的目的在学院车站，达拉斯，和Stephenville是与成长得典型地的庄稼相比在不同土壤在温暖季节的长期的switchgrass下面在C水池评估变化镇定的，在2001年2月的TX。采样深度是05，515，和1530厘米。Switchgrass增加了土壤器官的C(SOC)，玷污微生物引起的生物资源C(SMBC)，mineralizableC，和与常规收割相比的微粒有机物C(POM-C)系统。土壤C集中在顺序：长期的沿海的bermudagrass[Cynodondactylon(L.)Pers.]switchgrass1997>常规收割系统。土壤C集中趋于与增加泥土内容增加。更大的微生物引起的生物资源C跟随了达拉斯的顺序>学院车站>Stephenville，并且在达拉斯在Stephenville从约180mgCkg1土壤到1900mgCkg1土壤。微粒器官的C比对管理的另外的部分更敏感，像在与常规收割系统相比的长期的沿海的bermudagrass下面的6褶层一样增加。我们的学习显示进switchgrass生产的常规收割系统的变换能扣押更多的SOC并且改进土壤在南部的美国的生物性质。

简介：Effectsofcolumntemperatureandflowrateonseparationoforganicacidswerestudiedbydeterminingninelow-molecular-weightorganicacidsonreversed-phaseC18columnusinghighperformaceliquidchromatography(HPLC)withawavelengthofUV(ultraviolet)214nmandamobilephaseof18mmolL^-1KH2PO4buffersolution(pH2.1).Thethermalstabiltiyoforganicacidswasdeterminedbycomparingtherecoveriesoforganicacidsindifferenttemperaturetreatments.Therelationshipsbetweencolumntemperature,flowrateorsolventpHandretentiontimewereanalyzed.AtlowsolventpH,separatioinefficiencyoforganicacidswasincreasedbyraisingtheflowrateofthesolventbecauseofloweringtheretentiontimeororganicacids.Highcolumntemperaturewasunfavorablefortheseparationoforganicacids.Theseparatingeffectcanbeenhancedthroughreducingcolumntemperatureinorganicaciddeterminationduetoincreasingretentiontime.Highthermalstabilityoforganicacidswithlowconcentrationswasobservedattemperatureof40℃-45℃,SensitivityandseparationeffectoforganicaciddeterminationbyHPLCwereclearlyimprovedbyacombinationofraisingflowrateandloweringcolumntemperatureatlowsolventpH.

简介：土壤有机物(SOM)的分解具有为在土壤和温度和潮湿被看作控制SOM分解的二个重要因素的土壤之间的公司2交换的重要性。在这研究，土壤样品在在东北中国在Changbai山上从753～2357m的5举起被收集，并且在不同温度下面孵化了(5，10，15，20，25，和30????ü

简介：Afieldtestwiththetraditionalrotationofpaddyrice/uplandcrop(wheat)wascarriedoutonapaddysoilderivedfromredearthtoelucidatetheeffectoforganicmanureonthephoshporusadsorption-desorptionbysoilanditsPavailability.Soilsamplesweretakenfromdifferenttreatmentsatricehavestingstageandanalysed.TheisothermaladsorptionofPbythesamplesfittedverywellwithLangmuirequation,andhence,theparametersintheequation,i.e.,maximumadsorption(qm),constantrelatedtobondingenergy(k)andtheirproduct(k×qm)couldbeusedasacomprehensiveindextocharacterizethepotentialPadsorptivityofthesoil.Organo-inorganicfertilizationandorganicmanuringcoulddecreaseqmandk,whilemineralPapplicationhadlittleeffectonthem.TheisothermaldesorptionofPwassignificantlycorrelatedwithinitiallyaddedandisothermallyadsorbedP.PartofPaddedwasfixed,whichrepresentedthePfixationcapactyofsoil,andorganicmanuringcouldobviouslylowerthePfixation,ThecontentofsoilavailablePhadasignificantnegativecorrelationwithqm,kandfixedP.ItisconcluedthatorganicmanurecouldincreasethePavailabilityofpaddysoilderviedfromredearthbydecreasingqm.k,maximumbufferingcapacity(MBC=k×qm)andfixationcapacity.

简介：致力于为全球种植者提供创新解决方案的KeminIndustries近日推出新出新产品TetraCURB^TMOrganic(活性成分:50%迷迭香精油+3%丁香精油+1.95%薄荷精油),该产品是一款叶面喷施的杀螨剂、驱虫剂,适用于所有作物,为有机种植者提供了一种新选择,可以在整个作物季节控制螨虫压力。

简介：在农业土地支持土壤碳隐遁是可行策略之一速度观察气候变化。然而，玷污物理骚乱由加速侵蚀加重了土壤降级过程。因此，减少通过适当farming/agricultural系统的物理骚乱是的土壤的大小和紧张对农业陆地的土壤碳水池能力的管理必要。不同土地的四个地点使用类型/耕种惯例，我)到没有为止(NT)玉米(ZeamaysL.)(NTC)，ii)到为止常规(CT)玉米(CTC)，iii)pastureland(PL)，和iv)本国的森林(NF)，在北方Appalachian试验性的分水岭车站，包括水马厩聚集在土壤总数索引上估计NT耕作的影响的美国俄亥俄，吝啬的重量直径(MWD)和几何平均数被选择直径(GMD)，和土壤器官的碳和全部的氮内容。收到的NTC阴谋恐吓粪肥增加(大约15t哈1)每隔一年。CTC阴谋包含了耕作的disking和凿子和液体化肥申请(110L哈1)。结果证明水马厩聚集和MWD比为CTC在为NTC的土壤是更大的。在0-10厘米土壤层，>4.75公里尺寸部分统治了NTC并且而在不同地点之中的1)跟随了NF的趋势，为CTC多于那是46%>PL>NTC>CTC，为在CTC上的NTC更是35%-46%。NT实践提高了在CT实践上并且这样的器官的碳内容是的土壤在农田的碳隐遁的重要策略玷污。

简介：作为常规授精的一种选择评估器官的修正案的使用，沃土土壤的一个10年的实验在在Guadalquivir河山谷与化肥(NPK)和植物的堆肥(器官的化肥)使用的温室和室外的阴谋在一个庄稼旋转系统下面被进行，西班牙。土壤上的这二不同授精政体的效果物理性质被评估。玷污器官的碳(OC)，土壤体积密度(BD)，土壤水保留(WR)，可得到的水内容(AWC)，总数稳定性(作为)，并且玷污物理质量(德克斯特的索引，S)被决定。器官的化肥的使用增加了OC并且导致了的重要增加作为并且在与在温室和室外的阴谋的矿物质化肥申请相比的BD的减少。而温室阴谋出现了，室外的阴谋显示出最低BD价值象价值最高。在10年的实验的最后年里，S参数在器官的化肥阴谋是显著地更高的，特别为温室阴谋。在学习经期的结束，在在在在两个系统的治疗之间的领域能力(FC)的WR没有重要差别；AWC在矿物质在温室阴谋，但是更高也是类似的室外的阴谋。在矿物质化肥处理，在物理性质的小改进也与以前的集中的收割系统相比由于不太好攻击的耕种的利用被观察。物理土壤性质与土壤OC被相关。持续管理技术象器官的修正案的使用那样并且低或没有耕种改进了土壤物理性质，尽管有在管理的差别，那显著地逻辑地影响了结果。

简介：Settingmonitoringtransectinthemiddleandshallowwaterarea(altitude156-172m)inThreeGorgesreservoirhydro-fluctuationbelttoresearchthechangingcharacteristicsofthecontentsofN,P,K,pHandorganicmatterofthesoilwhichexperiencedtheinfluenceoffluctuationthefirsttime.Theresultsshowedthatbytheinfluenceofwaterlevelfluctuating,contentsofsoilN,P,K,pHandorganicmatterhadreducedindifferentsoillayersinhydro-fluctuationbelt.TheavailableNdecreasedby41.53%-59.87%,availablePdecreasedby5.26%-36.76%,availableKdecreasedby3.55%-45.56%,totalNdecreasedby9.52%-40.00%,totalPhadnochangegenerally,totalKhaddecreasedalittle,contentoforganicmaterialdecreasedby7.62%-37.83%%,pHvalueturnedtoneutral,changedby1.73%-9.58%.