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

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2008-06IIIAbstract Abstract AbstractAbstractSurface vegetation changes reflect the situation of ecological environment. Qinand Han Dynasties period in th

2、e middle and lower reaches of the Yellow Riversurface vegetation abatement process, then the ecological environment is a reflectionof the changes.Historical period of the residents living in the changing environment play

3、s a veryimportant role.In particular, the size and population density of population size.At thattime, this depends very much on the Government's population policy.Qin and HanDynasties period to take the immigration o

4、f Han Dynasty and the settlement policy ofencouraging childbirth at the time of surface vegetation play a role.In particular,immigration settlement， so that the grazing of the grassland turned into cultivatedfarmland. Wi

5、th the advance and retreat repeatedly dividing line between agricultureand animal husbandry in the middle reaches of the Yellow River ， there is a soilerosion and ecological deterioration in the period. In a sense, the w

6、ar to promote theprogress of history ， Qin and Han Dynasties period of several expeditions in thepromotion of historical progress, but also have a very serious ecologicalconsequences ，Huogong in particular the use, the d

7、estruction of vegetation on thesurface is very large. Qin and Han building of the ruling class and the traditionalwooden construction method of extensive use, this is to have a serious impact on theforest. Qin and Han Ho

8、uzang customs so that the trees have been severely damaged.Only as an example coffin supplies ， Han Dynasty period of a year spent at leastcompletely a million mu of trees. Yetie of the Qin and Han Dynasties is located i

9、n themiddle and lower reaches of Yellow River，Ye Tie is still the Qin and Han charcoalfor fuel, the widespread Yetie point on the local vegetation to reduce the surface alsohas a great responsibility.The ecological conse

10、quences by a series of social behaviour of the Qin and Handynasties Produced a period of ecological deterioration. The performance is theincreaseing Disaster of the Yellow River and part of the increase in the emergence

11、oftimber crisis. Faced with the crisis, the ruling class enacting a series of modernecological significance of the Act. Although the Act is based to a large extent amanifestation of benevolent. But in the advocacy Act “s

12、huntianshi,“ and “Do notcommit sishi ban“ is the concept of the ecological restoration of the Han Dynasty andre-built to the objective can not be denied the role.Keywords Keywords KeywordsKeywords： Qinhan Middle and Lowe