Climate Change And Agricultural Development In Han Dynasty

The main idea of this article is about the relationship between the change of historical climate and the development of agricultural economy.According to the recordation of the historical data and the related research,the article analyzies the condition and change of Han dynasty's historical climate which is warm from to cold and wet to dry.The change of the historical climate played a very important role in Han dynasty's agricultural economy.First of all.the change of Han dynasty's historical climate effected the variation of crop planting structure in the middle and lower reaches of the Yellow River basin.In the Han dynasty,the planting area of rice decreased in the middle and lower reaches of the Yellow River.However,the wheat which has high output and adapt to the drought,had promoted in Han dynasty.Second,the change of Han dynasty's historical climate also had an important effect on the traditional agricultural days.The 24 solar terms which had great effect on China's history had formed at this time.At last,the change of Han dynasty's historical climate had effected on the water conservancy facilities.In the western Han dynasty,the water conservancy facilities almost constructed in Guanzhong Basin.Following with the change of Han dynasty's historical climate,in the eastern Han dynasty,the water conservancy facilities had focused on Jiangnan areas.The final performance of change of Han dynasty's historical climate was the progress of Jiangnan areas' s agricultural economy and the decline of the Northern areas' s agricultural economy.Abnormal weather was a part of historical climate.Han dynasty was in a frequent meteorological disasters period.The meteorological disasters had a negative effect on agricultural economy.