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：InseismichazardanalysisofnuclearpowerplantofChinathereisaneedtoidentifybothseismogenicstructuresandseismotectoniczones.Inpastpractice,theidentificationoftheseismogenicstructureswasoftenbasedonthesurfaceactivefaultsandcharacterizationoflinearseismicsource.Inasituationwhichshowsquitestrongnon-randomseismicactivityandlackssurfaceactivefaults,itisdifficulttoevaluatetheseismichazardreasonably.TakingseismogenicstructuresintheDayao-Yao’anareaasacasestudyinthispaper,wediscusstheneedandthepossibilitytoapplytheplanarseismogenicstructuretotheseismotectonicmethod.Wesuggestthattheplanarseismogenicstructureshouldbeconsideredwhenapplyingtheseismotectonicmethodtotheseismicriskassessmentofnuclearengineeringinfuture.

简介：<正>O.IntroductionGoldiscommonlyconsideredaninertelement,butitsgeochemicalpropertiesarenotsoinert.Intheareaofgolddepositstheconecntra-tionsofgoldinwaterarehigh.Itcannotonlymigrateinwater,butalsoeasilyprecipitateifthechemicalconditionschange.Thisisimpor-tantbothinprospectingforgoldbyhydrogeochemicalmethods,andingoldformation.

简介：Adetailedinvestigationpermittedustoobtainquantitativedataconcerningfinegeometricstructuresof4faultsoftheactiveMaxianshan-Xinglongshanfaultsystemandthelatestmovementalongthem.OfthemthenorthernMaxianshanborderfaultisalarge-scale,stronglyactiveHolocenereversesinistralstrike-slipfault,theother3faults,thesouthernMaxianshanborderfaultandthesouthernXinglongshanborderandthenorthernXinglongshanborderfaultsaretheaccompanyingactivelate-Pleistocenethrustfaults,whichareincorporatedintothemainstrike-slipfault,thenorthernMaxianshanborderfaultatdepth.Itisthemostimportantearthquake-controllingfaultintheLanzhouarea,thefaultinfluencesandconstrainstheseismicactivityinthearea.

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简介：在地区性的规模的动态城市的扩大模拟是在陆地使用/盖住变化(LUCC)和都市化影响的全球环境变化的重要研究方法论之一。然而，以前的研究显示为在本地规模的未来情形的单个城市的扩大模拟不能为描绘并且解释地区性的都市化和全球环境变化的交互机制满足要求。这研究构造了一个地区性的动态城市的扩大模型(Reg-DUEM)对由集成人工的神经网络(ANN)和细胞的自动机(CA)模型的不同情形合适。第一，我们分析了城市的扩大的时间、空间的特征并且获得了用陆地使用/盖住的规则改变的优先的知识Beijing-Tianjin-Tangshan的数据集大主教区域。在不同情形下面的城市的扩大当时是的未来基于一个基线模型，经济模型，政策模型和结构的调整模型模仿了。结果显示Reg-DUEM在宏政策影响的地区性的规模为非线性的扩大模拟有好可靠性。模仿的结果显示出从大城市的区域的不同情形的城市的扩大模式有的那未来巨大的时间空间的差别。未来城市的扩大将沿着沿海的带从北京宗主国快速变到天津和Tangshan城市的圆周。

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简介：ThispapertakesmetropolitanareaofChongqingMunicipalityasanexample.Chongqing,locatedatthetailareaoftheThreeGorgesReservoir,isatypicallyin-landhillycityinChina.Aseriesofseriouseco-environmentalhazardaffectinghillycityhaveappeared:theforestlandscapehasbeenfragmented;thestabilityofecologicalsystemhasnotbeenmaintained;soilerosionhasbeenserious;geologicaldisastershavebecomemoreandmorefrequented;thephenomenonofcity'heatislands'isobvious;andenvironmentalpollutionisworsenedwithlowphysicalself-puri-fication.AllofthehazardsabovewillaffectecologicalsecurityofthetailareaoftheThreeGorgesReservoirandsus-tainabledevelopmentofChongqing.InordertoguaranteeecologicalsecurityandhealthofChongqingandtheThreeGorgesReservoir,thecountermeasuresforecologicalinfrastructureconstructionareputforward:quicklydrawingupecologicalinfrastructureplanningofChongqingMunicipality,strengtheningtheintegrationandcontinuationofhilly-waterspatialpattern,maintainingthediversityandstabilityoflocalecosystem,establishingthegreenspacesystemin-cludingsuburbanforest,farmlandandgreenspace,recoveringwetlandecosystem,optimizingindustrialstructureandurbanspatialdistribution,developingrecyclingeconomy,establishingecologicalinfrastructuremonitoringnetworkandinformationforecastsystem,carryingoutecologicalmanagementforChongqingMunicipalityandsoon.

简介：Onthebisisofdeterminingthethereelementsofthemocline(depth[upperbounddepth],thicknessandintensity)andthemaximumverticaltemperaturegradientofthesurveyingstation,thepapercalculatesthemeantemperatureoftheNanshadeep-watersurveyingstationwithintheupper-bounddepthlayerofthermoclineandthemeantemperaturebelowthelowerbounddepthofthermoclinebetweenthe300mand800mlayers,respectively.AnalysisindicatesthatthehorizontaldistributionofmeanseawatertemperatureshowsadistincttrendofthelowtemperatureseawaterslowlymovingfromtbenortheasttothesoutheastofNansha,whichseemstohavebeendrivenbytheNortheastMonsoon.Thelargertheverticaltemperatureradientis,thegreaterisitscapabilityofpreventingtheheatoftheupperseawaterfromdiffusingintothedeeperlayersontheverticaldirection.

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简介：BiogeochemicalinvestigationofTamarixaphylla,aplantspecies,oftheLas-belaareahasbeenmade.Thisareamainlyconsistsofophiolitesassociatedwithsed-imentaryrocksofJurassicandCretaceousage.QuantitativeestimationsofimportantbiogenictraceelementssuchasFe,Mn,Pb,Zn,Cu,Cr,Ni,andCohavebeencarriedout.Anomalousconcentrationsoftheseelementsinplantspeciesofcertainregionscanbeusedtolocatepossibleoccurrencesoforedepositsinthearea.Thecomparativestrdyalsorevealsappreciablevariationsinthecompositionoftraceelementsinplants.ThepossiblecausesofvariationintheconstitrentsofTamarixaphyllafromdifferentlocalitieshavebeendiscussedinthelightofbedrocknature,mo-bilityofelementandaverageabundanceintheplant.

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简介：Aimingatalleviatingtheserioussoilerosion,theChinesegovernmentinitiatedtheSlopingLandConversionProgram(SLCP)in1999.Now,after8yearsofprojectimplementation,theecologicalrecoveryeffectsoftheSLCPhavebecomethehotissueofacademiccircle.Thispaper,takingtheloesshillandgullyareaofnorthernShaanxiasanexample,presentsamethodologyforassessingthevegetationrestorationeffectofSLCPwithnormalizeddifferencevegetationindex(NDVI).ThekeycomponentsincludecalculationoftheGrowingSeasonNDVI(GSNDVI),andestimationoftheNVDIchangeinducedbyclimateandSLCP,respectively.Basedonthemethod,theNDVIchangebetween2000and2006wasobtainedusingtheGSNDVIthatexcludedthenoisefromsnowandice.AfterthepartoftotalNDVIchangecausedbyclimatevariationwasestimatedusingempiricformulae,weobtainedthepartinducedbyhumanfactors,i.e.theSLCP.ThehumaninducedpartofNDVIchangewasconsideredasanapproximationindicatingtheeffectoftheSLCPonthevegetation.Finally,weanalyzedtheNDVIchangecharactersofthewholestudyarea,differentslopelandsanddifferentlandusetypesbyspatialstatisticsmethod.ResultsshowthatthevegetationconditionissignificantlyimprovedbytheSLCP,particularlylandtypesthatdirectlyinvolvedintheSLCP,suchassteeplyslopefarmlands,degradedgrasslands,etc.

简介：Thegrowingcorrelationlengthpriortothemoderate-greatearthquakesoccurredinGansuProvinceanditsnearbyareasince1986hasbeenstudiedusingthemethodofsingle-linkclusteranalysis(SLC).Accordingtodifferentconditionsinthesourcearea,thecircularspatialwindowcenteredintheepicenterandtheparallelgrammicspatialwindowalongthefaultbelthavebeenselected.Theresultsshowthatthephenomenaofgrowingcorrelationlengthhavebeenobservedbeforetheearthquakesstudiedinthepaper.

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