I. Double cropping rice planting areas in southern China.
Located in the southernmost part of China, south of Nanling. Include southern Fujian, Guangdong, Guangxi and Yunnan, as well as Taiwan Province, Hainan and Nanhai islands. Including 194 counties (cities) (excluding Taiwan Province Province). The rice area accounts for 18% of the whole country.
1. Double cropping rice sub-region in hilly area of Guitai Plain in Fujian and Guangdong.
It starts from Changle County and Taiwan Province Province in Fujian Province in the east, reaches Guangnan County in Yunnan Province in the west and Wuchuan City in Guangdong Province in the south, including 13 1 county (city).
2. Sub-region of Single-cropping Rice in Southern Yunnan Valley Basin
The northern boundary starts from Malipo County in the east, passes Maguan and Kaiyuan to Yingjiang County, including 4 1 county (city) in southern Yunnan.
3. Multiple cropping subregion of double cropping rice in Qionglai Plain
Including 22 counties (cities) in Hainan Province and Leizhou Peninsula.
2. Central China Double Cropping Rice Planting Area
It starts from the coast of the East China Sea in the east, reaches the western edge of Chengdu Plain in the west, connects Nanling in the south, and connects Qinling Huaihe River in the north. Including all or most of Jiangsu, Shanghai, Zhejiang, Anhui, Jiangxi, Hunan, Hubei and Sichuan provinces, and the south of Shaanxi and Henan provinces, it is the largest rice planting area in China, accounting for 68% of the country's rice area.
1. Double cropping rice subregion in the middle and lower reaches of the Yangtze River
It is located in the north of the annual temperature ≥5300℃ isoline, south of Huaihe River, and east to the East China Sea coast in the mountainous area of western Hubei. Including 235 counties (cities) in Jiangsu, Zhejiang, Anhui, Shanghai, Hunan, Hubei and Henan.
2. Single cropping rice and double cropping rice subregion in Sichuan-Shaanxi basin
Mainly in Sichuan Basin and Chuandao Plain in southern Shaanxi, including Sichuan, Shaanxi, Henan, Hubei and Gansu provinces 194 counties (cities).
3. Sub-region of double cropping rice in hilly plain of South China
Annual accumulated temperature ≥10℃ to the south of the 5300℃ line, to the north of Nanling Mountains, from the east slope of western Hunan and Hubei to the coast of the East China Sea, ***294 counties (cities).
Three. Single-cropping and Double-cropping Rice Planting Areas in Southwest Plateau
Located in Yunnan-Guizhou and Qinghai-Tibet Plateau, ***39 1 county (city). The rice area accounts for 8% of the country.
1. Single and Double Cropping Rice Sub-region in Mountainous Area of Xiangxi Plateau in East Guizhou
Including 94 counties (cities) in central Guizhou, eastern Hunan, southwestern Hubei and southeastern Sichuan.
2. Single-cropping rice and double-cropping rice sub-region in the ridge and valley of Yunnan-Sichuan Plateau
Covering north-central Yunnan, southwest Sichuan, northwest Guangxi and central and western Guizhou 162 counties (cities).
3. Single cropping rice sub-region in alpine valleys of Qinghai-Tibet Plateau
The area suitable for planting rice is very small, and paddy fields are distributed in limited river valleys with low altitude, including central Yunnan, Deqin and Mangkang and Medog counties in eastern Tibet.
The rice planting area in northern China is only 30 million mu all the year round, accounting for about 6% of the rice planting area in China. The following is just a general introduction.
4. Single cropping rice planting areas in northern China.
It is located in the north of Huaihe River in Qinling Mountains, south of the Great Wall and east of Guanzhong Plain, including Beijing, Tianjin, Hebei, Shandong, Henan and parts of Shanxi, Shaanxi, Jiangsu and Anhui, with a total of 457 counties (cities). The area of rice only accounts for 3% of the whole country.
This area has two sub-areas:
1. Middle-early maturity subregion in the northern plain of North China.
2. Mid-late maturity subregion in hilly area of Huanghuai Plain.
The annual accumulated temperature ≥ 10℃ is 3500-4500℃. The safe growth period of rice is about 130- 140 days. During the growing period, sunshine 1200- 1600 hours, precipitation 400-800 mm, drought in winter and spring, and abundant and concentrated rain in summer and autumn. Most of the northern Haihe River and Beijing-Tianjin rice areas are medium-maturing japonica rice, while most of the Huanghuai areas are double-cropping wheat rice and indica rice. Rice blast and Chilo suppressalis are more harmful. In the future, it is necessary to develop water-saving rice planting techniques and implement comprehensive management of rice fields.
5. Northeast Early-maturing Single-cropping Rice Planting Area
Located in the north of Liaodong Peninsula and the Great Wall, east of Daxing 'anling, including all of Heilongjiang and Kyrgyzstan, most of Liaoning and northeastern Inner Mongolia, *** 184 county (flag, city). The area of rice only accounts for 3% of the whole country.
This area has two sub-areas:
1, ultra-early subregion of Hebei plain valley;
2. Early maturity subregion of Liaohe coastal plain.
6. Single cropping rice planting areas in arid areas of northwest China.
Located in the west of Daxinganling, north of the Great Wall, Qilian Mountain and Qinghai-Tibet Plateau. The marginal areas of Yinchuan Plain, Hetao Plain and Tianshan North-South Basin are the main rice growing areas. The area of rice accounts for only 0.5% of the whole country.
There are three subregions in this field:
1. Early maturity subregion of North Xinjiang Basin;
2. Middle-mature subregion of South Xinjiang Basin;
3. Early-middle maturity subregion of Gansu-Ningxia-Jinmeng Plateau.