A Study On The Environmental Situations Along The Middle Reaches Of Heihe River From Pre-Qin Period To Han Dynasty

The suitable environment can be benefit on the production and living of human being owing to the close relationships between it and human actions.With importance along the Hexi Corridor of the Silk Road,Heihe River is regard as the second inland river in China and is the earliest region to develop irrigation agriculture as well as the representative of the Central Asia arid region and the land and water resources in the western region.It has been the most bustling one along the whole basin since human appeared.And after more than two thousand years` development and usage,there are many environmental problems which not only have impacts on the local but the regions around even the whole country.Thus it is significant for the local environmental protection and economic development to do some researches on the relationships among the activities,climate and environment there.This article does some analyses on the human actions,climate and environmental changes from Pre-Qin period to Han Dynasty with the basis on other scholars` researches to synthesize methods of social and natural science,historical document and geology as well as field investigations.This passage have five parts:Chapter 1;Introduction.It is focus on its background,meaning,academic history,methods and composition.Chapter 2:The introductions of its nature and social,which describe its environment,social economy and history.Chapter3: The situations on the midstream of Heihe River.First,it introduce all kinds of archaeological culture and human actions during Qin Dynasty there.There appeared MajiayaoCulture,Xichengyi Culture,Siba Culture,Shanma Culture and Shajing Culture since 5000 years age to the War in Hexi Corridor.At the end of this period,Kushans and Huns became the masters.Then it concludes the climate changes.It had a fluctuating development from the end of last glacial period.Finally,it is focus on the environmental changes.With its big impacts from climat,Human actions can be ignored.And it appeared land desertification.Chapter 4: The environmental situations on the midstream of Heihe River.First it introduces the history of Han Dynasty.Then it concludes the climate changes.It was warm and dry in the early period and became moist and cold.Finally,it is focus on the environmental changes which is mainly depended on climate changes but with the human actions,it promoted the environmental changes.Chapter5: Conclusion.It concludes from the Chapter 3 and 4 as well as the enlightenments of its development from now on.