Born in the hillside and hilly area with an altitude of 400- 1800 meters, it is widely cultivated in the plain and hilly areas of China. Walnuts in China are widely distributed in Heilongjiang, Liaoning, Tianjin, Beijing, Hebei, Shandong, Shanxi, Shaanxi, Ningxia, Qinghai, Gansu, Xinjiang, Henan, Anhui, Jiangsu, Hubei, Hunan, Guangxi, Sichuan, Guizhou and other places.
Inner Mongolia, Zhejiang, Fujian and other provinces (regions) have a small amount of introduction or cultivation, and the main producing areas are in Yunnan, Shaanxi, Shanxi, Sichuan, Hebei, Gansu, Xinjiang, Anhui and other provinces (regions), among which Sanguan Forest Region in Bozhou City, Anhui Province is known as the largest walnut forest farm in Asia.
The horizontal distribution range of walnuts in China: from Mengla County, Yunnan Province, 2108 ′ 32 "north latitude to Bole County, Xinjiang, 44 54 ′ north latitude, with a longitude of 23 25 ′; It starts in Tashkurgan, Xinjiang, with an east longitude of 7515' and ends in Dandong, Liaoning, with an east longitude of124 21',spanning 49 06'.
Extended data
morphological character
Generally, it is as high as 3-5 meters, the bark is grayish white, shallowly longitudinally split, the pith of branches is flaky, and the young branches are thin (2-year-old branches are often hairless), and it is as high as 20-25 meters. The trunk is shorter than other species and the crown is wider. The bark is grayish green when it is young, grayish white when it is old, and it splits longitudinally.
Branchlets glabrous, shiny, covered with peltate glands, grayish green, and later brownish. The pinnate compound leaves are 25-50 cm long, with 5-9 leaflets, 65,438+03 rare, ovoid to ovoid, and the terminal leaflets are usually larger, 5-65,438+05 cm long and 3-6 cm wide, with sharp or tapering tips.
Entire or with inconspicuous blunt teeth, the surface is dark green, hairless, the back is only slightly hairy at the axils of veins, the petiole is extremely short or absent, and some shells are hard and some are soft.
Odd pinnate compound leaves are 25-30 cm long. When young, petioles and leaf axes are usually covered by extremely short glandular hairs and lobules, usually with 5-9 lobules, oval to oblong, about 6- 15 cm long and about 3-6 cm wide. The tip is blunt or sharp, short and tapering, the base is skewed and nearly round, the edge is full or there are sparse serrations on young trees.
There are tufts of hairs in the axils of leaves, the petioles of lateral leaflets are short or subsessile, the lower ones are smaller, and the petioles of terminal leaflets are about 3-6 cm long.
The male inflorescence is 5 ~ 10 cm long, the male flower has 6 ~ 30 stamens, the calyx is 3-lobed, the female flower has 1 ~ 3 flowers, and the style is 2-lobed and reddish.
Nutritional function
Nuts are full of nutrition. Regular consumption can prevent and treat heart disease, cancer and vascular diseases, and can also improve eyesight and brain. Walnut is one of the heart-strengthening foods recommended by Dr. Morrison, a contemporary natural therapist.
According to the determination, every 100g of walnut contains 50-64g of fat, 7 1% of the fat in walnut is linoleic acid, 12% is linolenic acid, protein is 15-20g, and protein is also a high-quality protein. The fat and protein in walnuts are the best nutrients for the brain.
Sugar is 10g, and contains calcium, phosphorus, iron, carotene, riboflavin (vitamin B2), vitamin B6, vitamin E, juglone, phospholipid, tannin and other nutrients.
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