Research On The Agricultural Disasters In Northwestern Area Of China During Han And Tang Dynasties

The agricultural development during Han and Tang dynasties in northwest China had opened the prelude of the big west-development in history, but ecological in northwest area is very fragile, several thousand years' pioneering development caused soil erosion, land desertification and shortage of water resources, the drought, the wind and the hail were the main types of disasters and directly affected agricultural production. To reduce the risk of natural disasters, people during Han and Tang dynasties had adopted a series of methods to deal with this, such as the adjustment production structure, the improvement of technology, choose the agricultural proper production Ways etc. This article divides the evolution of natural disasters during Han and Tang dynasties into three stage-replant, Qin-Han disasters rampant period, Wei-Jin disasters frequent period and Sui-Tang disasters diverse period, discuss the relationship between agricultural disasters and development of regional socio-economic by analyze the structure of natural disasters, characteristics, rules, disasters situations and measures to reduce the damage of natural disasters, finally, hope to do some meaningful things to disasters relief nowadays.There are five main parts of this article.Part I ,Foreword, which is Chapter One. This part give an overall understand and grasp to this topic, and introduce the aims and meanings, basement, research status at home and abroad, research content, methods and innovations.Part II,Natural disasters and agriculture development of northwest agricultural area during Qin and Han dynasties. This article discusses natural disasters and agriculture development of northwest agricultural area; further discuss the loss of several main agricultural areas and its effect to traditional agriculture.Part III,Natural disasters and changes of northwest agricultural area and animal husbandry area during Wei and Jin dynasties.Part IV,Natural disasters and expansion of northwest agricultural area during Sui and Tang dynasties. This part discuss natural disasters and the expansion of northwest agricultural area during Sui and Tang dynasties, and with the expansion of northwest agricultural area, natural disasters became diverse, traditional agricultural disaster reduced system made further development.Part V,Conclusion.