After the completion of Dujiangyan Water Conservancy Project, the good weather in Chengdu Plain has greatly increased the grain output. In the biography of the Three Kingdoms and Zhuge Liang: "Yizhou is in danger, fertile land is thousands of miles away, and the country is rich, so Gaozu is the emperor."
In the heyday of Chengdu in the Tang Dynasty, a poem by Li Bai said: "On the 9th, Chengdu opened 10%, and thousands of households entered the painting. The grass and trees are as beautiful as Yunshan, and there is nothing here in the Qin Dynasty. " Chengdu's position as a land of abundance has been consolidated. This is the first time in history that "Qin" and "Shu" are compared, and the status of Shu has been established, so Chengdu replaced the crown of "Land of Abundance" in Guanzhong and obtained the patent right of "Land of Abundance".
Extended data Sichuan Basin covers an area of about 260,000 square kilometers, accounting for 46% of the area of Sichuan Province. Sichuan Basin is bounded by Qinghai-Tibet Plateau and Hengduan Mountains in the west, Qinba Mountain in the north, Hanzhong Basin in the east, Xiangxi and Hubei Mountains in the south, Yunnan-Guizhou Plateau in the north, Micang Mountain in the south, Wushan Mountain in the east, Qionglai Mountain in the west, Longmen Mountain in the northwest, Daba Mountain in the northeast, Liangshan Mountain in the southwest and Wuling Mountain in the southeast.
The rocks here are mainly composed of purple sandstone and shale. These two kinds of rocks are easily weathered and develop into purple soil. Purple soil is rich in nutrients such as calcium, phosphorus and potassium, and it is the most fertile natural soil in China. Sichuan Basin is the most concentrated place of purple soil in China, and it has the reputation of "purple basin". The bottom area of Sichuan Basin is about 6.5438+0.6 million square kilometers. According to its geographical differences, it can be divided into three parts: the plains in the west of the basin, the hills in the middle of the basin and the ridges and valleys in the east of the basin.
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