乌兰布和沙漠的形成与环境变化-春喜

:1000-694X(2007)06-0927-05　　:2006-08-28;:2006-09-12　　:(2002CB714001);(40761028)　　:(1965—),(),,,,。E-mail:[e-mail]春喜1,陈发虎2,范育新2,夏敦胜3,赵辉3(1.,010022;2.,73000;3.,730000)　:,、,。OSL,7kaBP。,,,,。,,、。:;;;:P532:A　　,[1-8],,。2060,,,[1-3]。14C,,[4-5]。。14C,。,,,,。,,。,,,OSL,。,,,,,0.99km2[9](1)。,,。,-。,,,,300m1800m[10-11]。,,,。1955—2000,9.9℃,1-8.7℃;107.8mm,;2956.8mm;、,。1　1.1　,,。,,,1080～1200m,,20～100m,-。,,。,27　6200711　　　　　　　　　　　　　　　　JOURNALOFDESERTRESEARCH　　　　　　　　　　　　　Vol.27　No.6Nov.2007,。。,。,,。1020～1040m,,,。,,60m。,。,。、、30,。,,、,。(1),1052m1035m,11km,10～60m,,1　Fig.1　LocationofUlanBuhdesertandsamplingsites。1.2　OSL,[12-13]。。,,,30%,,[14]。RisoeTL/OSLDA-15,POST-IROSLEd,INAAK、Rb、Th、U,。14CBeta928　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　27　,AMS。2　2.1　,[15]。,,,,。2,,。BS10,2cm,;40～75cm,,,。BS4BS10,。BS4(6.73±0.76)kaBP,BS6WS2(6.77±0.61)kaBP(6.82±0.52)kaBP,。2　Fig.2　SamplingprofilesinthesouthwesternregionofUlanBuhdesert　　BS10(6.71±0.55)kaBP,。OSL,OSL。,,,,。,AMS(6569±0.56)aBP,BS2(6.42±0.71)kaBP。OSL,。,7kaBP。,,7kaBP,,。,,。,。,、[16]。、、、,7—5kaBP,[17-18],[17]。929　6:　　　,8.3—4.3kaBP[19]。,7kaBP,[20],,,[21]。,。[17-18],[19]。2.2　,。、、。,,、20～50m、[10],。1042m,1500km2。,、,。,。,7kaBP,,,,。,。,,7kaBP,,、,,。。,[22],,[23-24],20000km2,[24]。31kaBP,[25],,,[26-27]。。,。3　、,。,,;,。,、。OSL,7kaBP,。,,,,。(References):[1].[M].:,1965:69-94.[2].[J].,1973,2:92-107.[3].[M].:,2001:113-135.[4],,,.[J].,2003,23(2):165-170.[5],,.[J].:,1997,3:46-49.[6],,,.[J].,1999,19(3):223-227.[7].[J].:,2003,2(3):87-91.[8],,.[J].,1991,5(1):1-11.[9].[M].:,2005.[10].[M].:,1991:327-329.[11]《》.[M].:,1988:20-61.[12].、[J].,2003,26(1):36-39.930　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　27　[13],,,.[J].,1999,19(4):403-406.[14]AitkeaMJ.Anintroductiontoopticaldating[M].Oxford:OxfordUniversityPress,1998:108-139.[15],,,.150ka、[J].:B,1995,25(12):1303-1312.[16],,,.[J].,2001,46(17):1414-1419.[17]ChenFH,WuW,HolmesJA,etal.Amid-HolocenedroughtintervalasevidencedbylakedesiccationintheAlashanPlat-eau,InnerMongolia,China[J].ChineseScienceBulletin,2003,48(14):1401-1410.[18]ChenFH,ShiQ,WangJM.Environmentalchangesdocu-mentedbysedimentationofLakeYiemainaridChinasincetheLateGlaciation[J].JournalofPaleolimnology,1999,22:159-169.[19]ChenC-TA,LanHC,LouJY,etal.ThedryHoloceneMegathermalinInnerMongolia[J].Palaeogeography,Palaeo-climatology,Palaeoecology,2003,193:181-200.[20],.[J].:,1988,18(4):94-101.[21]LiuHY,XuLH,CuiHT.Holocenehistoryofdesertificationalongthewoodland-steppeborderinnorthernChina[J].QuaternaryResearch,2002,57:259-270.[22]GuoHD,LiuH,WangXY,etal.Subsurfaceolddrainagede-tectionandpaleoenvironmentanalysisusingspaceborneradarimagesinAlxaPlateau[J].ScienceinChina:D,2000,43(4):439-450.[23]PachurHJ,WnnemannB,ZhangHC.LakeevolutionintheTenggerDesert,northwesternChinaduringLast40000Years[J].QuaternaryResearch,1995,44(2):171-180.[24]ZhangHC,PengJL,MaYZ,etal.LateQuaternarypalaeo-lakelevelsinTenggerDesert,NWChina[J].Palaegeography,Palaeoclimatology,Palaeoecology,2004,211(1-2):45-58.[25]YangXP,LiuTS,XiaoHL.EvolutionofmegadunesandlakesintheBadainJaranDesert,InnerMongolia,Chinaduringthelast31000years[J].QuaternaryInternational,2003,104:99-112.[26],.[J].,2005,25(2):281-286.[27],,,.150kaBP[J].,2005,25(4):457-462.FormationofUlanBuhDesertandItsEnvironmentalEvolutionCHUNXi1,CHENFa-hu2,FANYu-xin2,XIADun-sheng3,ZHAOHui3(1.InstituteofGeographySciences,InnerMongoliaNormalUniversity,Hohhot010022,China;2.NationalLaboratoryofWesternChina'sEnvironmentalSystems,LanzhouUniversity,Lanzhou730000,China;3.KeyLaboratoryofDesertandDesertification,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSci-ences,Lanzhou730000,China)Abstract:Extensiveinvestigationandstudiesontopography,sedimentaryandchronologyshownewevi-dencesforformationandevolutionofUlanBuhdesertduringearlyHolocene.Provedbyevidencesonclay-sandstrataandplantrootsunderinter-dunelowlands,lakeshorelinescoveredbyplentyofCorbiculalargil-lierti,andlargeamountsofdrysaltlakesinthecentralregionofUlanBuhdesert,manymegalakeseverex-istedinthehinterlandofUlanBuhdesert.SeveralOSLsamplescollectedfromaeoliansandsoverlyinglacus-trinesedimentsinprofilesaroundJrentaisaltlakeandinter-dunelowlandsinthesouthernUlanBuhdesertsuggestthatthedesertbeganaround7kaBP.TheformationofUlanBuhdesertmayberesultedfromtheshrinkingofJrentaimegalakeandsandsblewfromexposedloosesediments.Keywords:UlanBuhdesert;palaeolakeevolution;environmentalevolution;aeoliandeposition931　6: