秦漢時(shí)期黃河中下游地區(qū)生態(tài)變遷考察——以地表植被為例_16048.pdf

1、西北師范大學(xué)碩士學(xué)位論文秦漢時(shí)期黃河中下游地區(qū)生態(tài)變遷考察——以地表植被為例姓名：王飛申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：歷史地理學(xué)指導(dǎo)教師：田澍200806IIIAbstractAbstractAbstractAbstractSurfacevegetationchangesreflectthesituationofecologicalenvironment.QinHanDynastiesperiodinthedlelowerreachesofth

2、eYellowRiversurfacevegetationabatementprocessthentheecologicalenvironmentisareflectionofthechanges.Histicalperiodoftheresidentslivinginthechangingenvironmentplaysaveryimptantrole.Inparticularthesizepopulationdensityofpop

3、ulationsize.AtthattimethisdependsverymuchontheGovernmentspopulationpolicy.QinHynastiesperiodtotaketheimmigrationofHanDynastythesettlementpolicyofencouragingchildbirthatthetimeofsurfacevegetationplayarole.Inparticularimmi

4、grationsettlement，sothatthegrazingofthegrasslturnedintocultivatedfarml.WiththeadvanceretreatrepeatedlydividinglinebetweenagricultureanimalhusbryinthedlereachesoftheYellowRiver，thereisasoilerosionecologicaldeteriationinth

5、eperiod.Inasensethewartopromotetheprogressofhisty，QinHanDynastiesperiodofseveralexpeditionsinthepromotionofhisticalprogressbutalsohaveaveryseriousecologicalconsequences，Huogonginparticulartheusethedestructionofvegetation

6、onthesurfaceisverylarge.QinHanbuildingoftherulingclassthetraditionalwoodenconstructionmethodofextensiveusethisistohaveaseriousimpactonthefest.QinHanHouzangcustomssothatthetreeshavebeenseverelydamaged.Onlyasanexamplecoffi

7、nsupplies，HanDynastyperiodofayearspentatleastcompletelyamillionmuoftrees.YetieoftheQinHanDynastiesislocatedinthedlelowerreachesofYellowRiver，YeTieisstilltheQinHancoalffuelthewidespreadYetiepointonthelocalvegetationtoredu

8、cethesurfacealsohasagreatresponsibility.TheecologicalconsequencesbyaseriesofsocialbehaviouroftheQinHynastiesProducedaperiodofecologicaldeteriation.TheperfmanceistheincreaseingDisasteroftheYellowRiverpartoftheincreaseinth

9、eemergenceoftimbercrisis.FacedwiththecrisistherulingclassenactingaseriesofmodernecologicalsignificanceoftheAct.AlthoughtheActisbasedtoalargeextentamanifestationofbenevolent.ButintheadvocacyAct“shuntianshi““Donotcommitsis