预览加载中，请您耐心等待几秒...

塔里木河流域绿洲土壤盐分遥感反演模型研究.docx

预览
1/3
2/3
3/3

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

塔里木河流域绿洲土壤盐分遥感反演模型研究 Abstract: TheTarimRiverBasinislocatedinthearidandsemi-aridregionofnorthwestChina,whereoasisagricultureplaysasignificantroleinthelocaleconomyandecology.Thesalinizationofoasissoil,however,posesamajorchallengetosustainabledevelopment.Inthisstudy,weproposedaremotesensing-basedmodeltoestimatesoilsalinityintheTarimRiverBasin.WeusedLandsat8OLI/TIRSdata,spectralindices,andfieldmeasurementsofsoilsalinitytodevelopapredictivemodel.Theperformanceofthemodelwasevaluatedusingtwostatisticalindices,coefficientofdetermination(R2)androotmeansquareerror(RMSE).OurresultsindicatethatthemodelachievedahighaccuracywithanR2of0.82andRMSEof1.26dS/m.Thespatialdistributionofsoilsalinitywasthenmapped,whichrevealedtheseverityofsoilsalinizationindifferentoases.Ourresultscouldprovideimportantinformationforpolicymakersandlocalfarmerstodevelopeffectivestrategiesforsoilmanagement. Introduction: Asoneofthelargestinlandriverbasinsintheworld,theTarimRiverBasincoversanareaof1.02millionsquarekilometers,withapopulationofover10million.Theregionischaracterizedbyanaridandsemi-aridclimate,withalimitedwatersupply,andhighevaporationrates.Despitetheseharshconditions,oasisagriculturehasbeenpracticedforthousandsofyears,providingastablesourceoffoodandincomeforlocalcommunities.Inrecentyears,however,thesalinizationofoasissoilhasbecomeamajorchallengetosustainabledevelopmentintheregion.SoilsalinityisawidespreadproblemintheTarimRiverBasin,andithasbeenestimatedthatabout80%ofthecultivatedlandintheregionisaffectedbysoilsalinization(Wangetal.,2017).Highsoilsalinitycanreducecropproductivity,causesoildegradation,andaffectlocalecosystems. Traditionalmethodsofsoilsalinityassessmentaretime-consuming,labor-intensive,andoftenlimitedtoafewsamplelocations.Remotesensing-basedapproaches,however,haveshowngreatpotentialinprovidingtimelyandcost-effectivemeasurementsofsoilsalinityoverlargeareas.Anumberofspectralindiceshavebeenproposedtoestimatesoilsalinity,suchasNormalizedDifferenceVegetationIndex(NDVI),SoilAdjustedVeget