The four granaries in China are the four major plains of grain production in China, namely, the Northeast Plain, the North China Plain, the Middle and Lower Reaches of the Yangtze River and the Pearl River Delta Plain. The soil layer in North China Plain is deep and fertile. The main food crops are wheat, rice, corn, sorghum, millet and sweet potato, and the cash crops are mainly cotton, peanuts, rape, sesame, soybean and tobacco. The soil layer in North China Plain is deep and fertile. The main food crops are wheat, rice, corn, sorghum, millet and sweet potato, and the cash crops are mainly cotton, peanuts, rape, sesame, soybean and tobacco. The Pearl River Delta, which is formed by the confluence of three major rivers in the east, west and north, covers an area of over 654.38+100000 square kilometers and has become one of the commodity grain bases in China. The plain in the middle and lower reaches of the Yangtze River extends from Wushan to the seaside, which is alluvial by the Yangtze River and its tributaries. The area is about 6.5438+0.6 million square kilometers. The plain is lower than the North China Plain, with an average elevation of less than 50 meters. Some places are less than 5 meters above sea level. There are many rivers and lakes, so it is called a water town and a country.

Four granaries in China

Northeast Plain [the largest plain in China]

Located in the northeast of China, between Daxing 'anling, Xiaoxing 'anling and Changbai Mountain, with an area of 350,000 square kilometers, it is the largest plain in China. Most of them are below 200 meters above sea level, and the ground is vast and flat, including Sanjiang Plain, Songliao Plain, Songliao Basin, Liaohe Plain and many swamps along the river. It mainly includes Heilongjiang, Jilin and Liaoning provinces.

North China Plain

Taihang Mountain in the west, seaside in the east, Yanshan Mountain in the north and Huaihe River in the south. Covering an area of 300,000 square kilometers, it is deposited by sediment carried by rivers such as the Yellow River, Huaihe River and Haihe River, also known as the Huanghuaihai Plain. The average elevation is below 100 meters, with low terrain, deep soil layer and fertile soil. It mainly includes Hebei, Henan, Beijing, Tianjin and Shandong (including northern Jiangsu and northern Anhui).

Plains of the Middle and Lower Reaches of the Yangtze River

From Wushan to the east to the seaside, it is alluvial from the Yangtze River and its tributaries. The area is about 6.5438+0.6 million square kilometers. The plain is lower than the North China Plain, with an average elevation of less than 50 meters. Some places are less than 5 meters above sea level, and there are many rivers and lakes, so it is called "water town Zeguo". It mainly includes Hubei, Anhui, Jiangsu, Shanghai and northern Zhejiang.

Pearl River Delta Plain

It is located in the south-central part of Guangdong Province, with an area of about 1 1000 square kilometers and an average elevation of about 50 meters. The river network here is vertical and horizontal, and the isolated mountains are scattered.

abstract

China has a vast territory and a long history of grain production and storage. According to a large number of cultural relics and historical studies unearthed in China in recent 50 years, China's primitive agriculture originated in the late Paleolithic period and developed in the Neolithic period (about 1 10,000 years ago). Grain storage is the continuation of agricultural cultivation, and storage technology develops with the development of agriculture. After entering the Neolithic Age, with the development of primitive agriculture, agricultural production formed a certain scale, and there was a surplus of grain, which gradually developed from grain processing to storage. Granary is an important part of grain storage technology.

The granary construction should put the full guarantee of grain storage safety in the first place, and meet the needs of grain storage safety from the physical, physiological and ecological characteristics of grain itself.

The choice of warehouse type should be based on local conditions, and the suitable warehouse type should be determined according to the climatic conditions, geological structure, grain characteristics, grain storage properties and functions of each region, so that it is not possible to make a "one size fits all" across the country; The building structure and materials of granary should be selected according to the economy of opening granary and the safety of grain storage, so as to gradually improve the comprehensive performance of granary in China.