简介：Spectralfeatureofforestvegetationwithremotesensingtechniquesistheresearchtopicallovertheworld,becauseforestplaysanimportantroleinhumanbeings'livingenvironment.Researchonvegetationclassificationwithvegetationindexisstillverylittlerecently.Thispaperproposesamethodofidentifyingforesttypesbasedonvegetationindices,becausethecontrastofabsorbingredwavebandwithreflectingnear-infraredwavebandstronglyfordifferentvegetationtypesisrecognizedasthetheoreticbasisofvegetationanalysiswithremotesensing.Vegetationindexishighlyrelatedtoleafareaindex,absorbedphotosyntheticallyactiveradiationandvegetationcover.Vegetationindexreflectsphotosynthesisintensityofplantsandmanifestsdifferentforesttypes.AccordingtoreflectancedataofforestcanopyandsoillineequationNIR=1.506R+0.0076inJingyuetan,ChangchunofChina,manyvegetationindicesarecalculatedandanalyzed.Theresultshowsthattherelationshipsbetweenveg

简介：ＰｉｃｔｏｒｉａｌＡｌｂｕｍｏｎＴｉｂｅｔａｎＶｅｇｅｔａｔｉｏｎ￥ｂｙＬｉＢｏｓｈｅｎｇＡｔｔｈｅＦｉｒｓｔＣｏｎｆｅｒｅｎｃｅｏｆＥａｓｔＡｓｉａＳｔａｔｅＰａｒｋｓａｎｄＰｒｏｔｅｃｔｉｏｎｈｅｌｄｉｎＢｅｉｊｉｎｇｆｒｏｍＳｅｐｔｅｍｂｅｒ１...

简介：Vegetationdegradationisrelatedtothestabilityandsuccessionprocessofecologicalsystems.Thispapercombedandscreenedtherecentnationalandinternationalresearchonvegetationdegradation,anddiscussedvegetationdegradationresearchintermsofselectionofreferenceecosystemforevaluation,selectionofevaluationindexsystemandtheselectionofevaluationmethods.Atlast,thedirectionofvegetationdegradationresearchwaspredictedandprospected.

简介：Oncomelania(Oncomelaniahupensis),adioecian,ovoviviparous,andamphibioussnail,isthesoleintermediatehostofSchistosomajaponicum,themostwide-spreadsnailfeverintheworld.Chemicaleliminatingthehostprovedunacceptablefortherewasseverecontaminationtowaterandsoil.TheriverbeachesandthedeltaareasoffiveprovincesinthemiddleandlowerreachesofYangtzeRiverinChinaprovidethemostfavorablehabitatsforOncomelania.Ourstudieshaverevealedthattheoccurrenceof...

简介：Wetlands,oneofthemostproductivesystemsinthebiosphereareauniqueecosystem.Theyoccurinlandscapesthatfavorthepondingorslowrunoffofsurfacewater,dischargeofgroundwater,orboth.Wetlandsarenotonlyimportantformaintainingplantandanimaldiversity,butalsoforbalancingglobalcarbonbudgetviasequestratingorreleasingCO2from/intoatmospheredependingontheirmanagement.Therefore,itisimperativetounderstandhowwetlandsformandfunction,thenwecanbettermanage,utilize,andprotecttheseuniqueecosystems.Hydriesoils,hydrophyticvegetation,andwetlandhydrologyarethethreemainparametersofwetlands.Theseparametersareinterrelatedwitheachotherwhichjointlyinfluencethedevelopmentandfunctionsofwetlandecosystems.Theobjectiveofthispaperwastoreportthecurrentunderstandingofwetlandsandprovidefutureresearchdirections.Thepaperwillfirstfocusonaspectsofhydrologyresearchinwetlands,andthenshifttosoilhydrosequenceandwetlandvegetationtobetterunderstandprocesses,structure,andfunctionofwetlands,andconcludewithsomepossiblefutureresearchdirections.

简介：Vegetationindices(VI)areoneofthestandardscienceproductsavailablefromtheModerateResolutionImagingSpectroradiometer(MODIS),ValidationofMODIS-VIproductswasanimportantprerequisitetousingthesevariablesforglobalmodeling.Inthisstudy,validationoftheMODIS-VIproductsincludingsingle-dayMODIS,level2(gridded)dailyMODISsurfacereflectance(MOD09),16-daycompositedMODIS(MOD13)wasperformedutilizingmultisensordatafromMODIS,ThematicMapper(TM),andfieldradiometer,forarice-plantingregioninsouthernChina.Thevalidationapproachinvolvedscalingupindependentfine-graineddatasets,includinggroundmeasurementandhighspatialresolutionimagery,tothecoarserMODISspatialresolutions.The16-daycompositedMODISreflectanceandVImatchedwellwiththegroundmeasurementreflectanceandVI.TheVIofTMandMODISwerelowerthanthegroundVI.Theresultsdemonstratedtheaccuracy,reliability,andutilityoftheMODIS-VIproductsforthestudyregion.

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简介：Thebendingrigidityofsubmergedvegetationiscloselyrelatedwithvegetativedragforce.Thisworkaimsatdeterminingtheeffectsofflowconditionsandcharacteristicsofvegetationonthebendingrigidityofsubmergedvegetation.Basedonthedimensionalanalysismethod,thefactorsinfluencingthebendingrigidityofindividualsubmergedvegetationwereanalyzed.Therelationshipbetweentherelativebendingrigidityanditsinfluencingfactorswasinvestigatedbyexperimentalobservation,andarelativebendingrigidityexpressionforsubmergedvegetationwasobtainedbymeansofmultiplelinearregressionmethod.Theresultsshowthatthesubmergedvegetationhasthreestatesunderdifferentinflowconditions,andtheeachcriticalrelativebendingrigidityofindividualsubmergedvegetationwasdeterminedforthedifferentstatesofsubmergedvegetation.

简介：Byusingfourspeciallydesignednarrowbandpassfiltersandphotodetectorsintheinstrument,theincidentandreflectedradiancesofsunlightonthevegetationareopticallysensed,attheredandnearinfraredbands,thenthenormalizeddifferencevegetationindex(NDVI)isprocessedbyamicroprocessor.ComparedwithconventionalspectrometermeasuringmethodofNDVI,theinstrumentiseasytobeused,compact,lightandlow-cost.

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简介：大木质的碎片和木质的植被能对隧道水力学和形态学施加主要影响，在特别地更小(<30m宽)溪流。尽管碎片和植被长被用于河槽冲刷和沉积控制，为设计者的科学地基于的指南是少见的。最近

简介：Submergedvegetationhasasignificantimpactonwaterflowvelocity.Currentinvestigationsincludetheimpactthroughaddingdragresistanceandincreasingbottomroughnesscoefficient,whichcannotelucidatethecharactersofrealsubmergedvegetation.Toevaluatetheeffectsofsubmergedvegetationonwatercurrentsatdifferentvelocities,alaboratoryexperimentwasconductedusingthreekindsofvegetations.Theeffectiveheightsofthesevegetationsonvaryingflowvelocitieswereevaluated.AnequationdescribingtherelationshipbetweenthenormalizedresistanceofthesubmergedplantsandtheReynoldsnumberbasedontheplanteffectiveheightwasthenestablishedandusedtocalculatethehydraulicresistanceparametersofsubmergedplantsindifferentstagesofgrowth.

简介：因为在城市的区域的复杂变化，基于面具技术修改了CVA申请能使缩小非植被的效果变化并且在很大程度上在效率之上改善。而且，从方法收极的阴谋，有PVI的绝对尖、全部的大小的技术措施变化计算了根据线性与用3DG-S计算的least-squareestimation和GVI合适转变。最后，这应用在2002和2005与武汉的陆地卫星ETM+形象被执行，并且由错误矩阵估计了，以它能检测的方法94.91%改正的变化象素，和全部的一致系数Kappa能到达to0.85。评估结果演示趋势作为城市的植被的一种有效、有效的选择改变的这个新应用程序抽取。

简介：Aquaticvegetationplaysanimportantroleintheflowstructureofopenchannelsandthuschangesthefateandthetransportofsediment.Thisarticleproposesathree-dimensionalturbulencemodelbyintroducingvegetationdensityanddragforceintothecontrolequationsofwaterflowinthepresenceofvegetation.Themodelwasusedtocalculatetheimpactsofsubmergedvegetationontheverticalprofilesoflongitudinalflowvelocities,thechangesofthedepth-averagedflowvelocitiesinacompoundchannelwithemergentvegetationinthefloodplain,theremovalofsuspendedsedimentfromthechannelsbyemergentvegetation,andthebedchangesaroundandinavegetatedisland.Numericalinvestigationsshowthataquaticvegetationretardsflowinthevegetationzone,reducesthesedimenttransportcapacity,andcontributestoerosiononbothsidesofthevegetatedisland.Calculatedresultsagreewellwithexperimentalresults.

简介：在深黄土土壤存储的水是在黄土高原的半干旱的区域调整植被生长的最重要的资源之一，但是种灌木和森林经常破坏自然的水周期并且接着影响植物生长。这研究的目的是在土壤潮湿和它的内部年度的变化上检验主要植被类型的效果。在六植被的010m深度的土壤潮湿打字，即，庄稼，草，锦鸡儿属植物的种的灌木，侧柏的种的森林，松和松和侧柏的混合在2001，2005和2006被测量。在农田的大约03m和另外的植被类型的大约02m的土壤潮湿内部每年在年度降水上改变了依赖者，但是在这些深度下面内部每年是稳定的。在02m，农田的土壤潮湿比所有另外的植被类型的那些显著地大，并且在另外的植被类型之中没有重要差别。在210m，农田和草地之间没有重要潮湿差别，但是在他们俩下面的土壤潮湿比种的灌木和森林的那些显著地高。种的灌木和森林弄空在2m到或近永久的枯萎点下面的土壤潮湿，并且在森林类型之中没有重要潮湿差别。锦鸡儿属植物灌木的土壤潮湿是比森林的那些显著地低的，但是绝对差别是很小的。这研究的结果含有种的灌木和森林深弄空土壤潮湿到他们能提取到的最低限制并且他们为蒸发主要靠现在的年降水生活了。

简介：Accordingtodifferencesinvegetationtypesandtheircoverage,combiningthelatestresearch,usingtheoryandmethodonthevalueofvegetationecosystemservices,thispapernotonlycalculatedgoodsproducedbydifferenttypesofvegetationbutalsoestimatedthevalueofvariousvegetationecosystemservicesandsetupdatabase,GISandeco-accountofvegetationecosystem.Theresultwasasfollows:thevalueofvegetation''sprimaryproductivity,soilandfertilityconservation,waterconservation.CO2fixationandO2releasewas199.6billionyuan/a22.64billionyuan/a22.6billionyuan/a,352.24billionyuan/aand374.19billionyuan/a,respectively.Thetotalvalueofecosystemserviceswas968.33billionyuan/a.Thetemperatedeciduousbroad-leavedforesthadthehighestcontributionrate,accountingfor16.42%,Theresultofvaluecanreflectregionalrealitymoreexactly.

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简介：Predictingpotentialchangesingroundwatersalinityinlow-lyingcoastalregionsduetoclimatechangeisimportant,wherecoastalvegetationisabundant,successioncompetitionbetweenhalophytesandglycophytesplaysasignificantroleinthesalinitybudget.Sealevelriseenhancessalinityintrusion,contributinganadditionaldimensiontovegetationcompetition.Anewsimulationmodelknownasmangrove-hardwoodhammockmodelcoupledwithsaturated-unsaturatedtransport(MANTRA)hasrecentlybeendevelopedbytheauthorstosimulategroundwatersalinityregimesinthepresenceofvegetationcompetition,subjecttoclimatechange.MANTRAisbaseduponlinkingtwoexistingUnitesStatesgeologicalsurvey(USGS)simulationmodelsknownasmangrove-hardwoodhammockmodel(MANHAM)andsaturated-unsaturatedtransport(SUTRA).MANHAMsimulatestheevolutionofvegetationsuccessionsubjecttochanginggroundwatersalinity.SUTRAsimulatessaturatedandunsaturatedtransportofsolutesandsalinityingroundwatergivenseasalinity.MANTRAimprovesthesimulationrobustnesstosimultaneouslysimulategroundwaterhydrology,salinityandcoastalvegetationsuccessionsubjecttosealevelrise.Somesimulationresultswillbepresentedtodemonstratetheimpactofsealevelriseoncoastalvegetationsuccessionandgroundwatersalinity.

简介：Theeffectofvegetationontheflowstructureandthedispersionina180ocurvedopenchannelisstudied.TheMicroADVisusedtomeasuretheflowvelocitiesbothinthevegetationcasesandthenon-vegetationcase.Itisshownthatthevelocitiesinthevegetationareaaremuchsmallerthanthoseinthenon-vegetationareaandalargevelocitygradientisgeneratedbetweenthevegetationareaandthenon-vegetationarea.ThetransverseandlongitudinaldispersioncoefficientsareanalyzedbasedontheexperimentaldatabyusingthemodifiedN-zonemodels.Itisshownthattheeffectofthevegetationonthetransversedispersioncoefficientissmall,involvingonlychangesofasmallmagnitude,however,sincetheprimaryvelocitiesbecomemuchmoreinhomogeneouswiththepresenceofthevegetation,thelongitudinaldispersioncoefficientsaremuchlargerthanthoseinthenon-vegetationcase.

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