民勤綠洲及其毗鄰沙漠流動(dòng)沙丘表面沉積物的元素分析.pdf

1、蘭州大學(xué)碩士學(xué)位論文民勤綠洲及其毗鄰沙漠流動(dòng)沙丘表面沉積物的元素分析姓名：任孝宗申請學(xué)位級別：碩士專業(yè)：自然地理學(xué)指導(dǎo)教師：王振亭20100501AbstractMinqinOasisislocatedbetweenBadainJaranDesertandTenggerDesert，anditisthenaturalbarriertokeepbackthetwodeserts’ConfluenceTherewereagreatnumbe

2、roflakes，abundantwaterresourseandthickgrassinMinqinOasisibeingfedbytheShiyangRiver’whichmadethisareaalwaysbetheChineseethnicminorities’naturalpastureandplayanimportantroleonthedevelopmentoftheChinesenationinhistoryHoweve

3、rwithclimatechangeandtheincreasingabilitywithwhichhumanbeingcanchangethenaturedramasticallythewaterresourseofShiyangRiverwasdecreasingandtheecologicalenvironmentofMinqinwasdegeneratingbythefactorsofdryrainless，warandover

4、exploitationUnderthecircumstanceofdevelopingthewestregionsandpayingattentiontoenvironmentprotection，governmentshavebeguntodrawtheblueprintofecologicalrestorationTheexpectationofpremierWenJiabao“neverallowMinqinOasisbecom

5、ethesecondLopNorLake’’havebeenencouragingpeopleconstantlyplungeintotheactivityofsandprotectionandsandcontr01SedimentsaboveactivesanddunesinMinqinOasisanditsadjacentdesertswerestudiedXRFwasappliedtotestsediments’elementSu

6、rfacesedimentselementarytransferencewasdiscussedbasedoncorrelationcoefficientLocatedsandsoursebythemethodofelementsnormalizationandusedenrichmentfactorSi／AlandSi／阻Fe)，chemicalweatheringindex，discriminantfunctiontoconfirm

7、theconclusionFinallyMinqinOasiswasdividedintofourregionsbased011theconclusionofsandanalysis，respectivelyupstreamregion，midstreamregion，lowerstreamregionandterminallakeregioninShiyangRiverdrainageofMinqinThereweresomeconc

8、lusionsaccordingtotheresultsThesedimentsofupstreamregionstemedfromTenggerDesert，itssouthSOitssandsubstanceWastransmittedfromitsneighborThesedimentsofmidstreamregionstemedbothfromMinqinOasisandTenggerDesertwhichlocatedits