It is the treasure of Lin 'an County. According to 1983 forest resources survey, the forest area of the county reached 65,438+062,949 mu, and now it has grown to 257,800 mu, which has always been the best in Changhua County, so it is called Changhua Carya cathayensis. Mainly distributed in Taoist, Xinqiao, Yu Tao, Shunxi, Jiaokou, Ma Xiao, Tuankou, Longgang, litmus, Lu Heng and other towns, and a few towns such as Taiyang, XiTianmu, DongTianmu, Yangling, Limu and Qingyun. Carya cathayensis belongs to Carya genus of Juglandaceae, which is planted in oil yellow soil, black calcareous soil and calcareous shale formed by limestone weathering. Usually, the first fruiting period is 10- 15 years. After years of research by forestry science and technology workers in this county, the first fruiting period can be shortened to 5 years by grafting technology, which has created a strong condition for accelerating the development of hickory production. ). In another 25 years, this tree will reach its full fruit stage, and its age can reach 60-70 years to 100 years. Every year, it matures around the Millennium, with different ages. The fruit is round, thick-skinned, ribbed and yellowish brown. After peeling off the skin with a chisel, the stone looks like a spherical nut, with a slightly sharp head, yellowish white and fine wood grain. Nuts float in clear water and let them sink. After cooking, it turns brown or dark brown, and after drying, it is called light pecan, which is the product. Carya cathayensis has a high oil content, with the net kernel oil content as high as 69.8 ~ 74% and the shell oil yield of 28%. Carya cathayensis is rich in vegetable oil, and its protein content is 18.3%. It also contains many vitamins, which have the functions of moistening intestines, nourishing and anti-aging in medicine. After the pericarp is burnt to ashes, the alkali content reaches 20 ~ 30%, of which the potassium carbonate content reaches more than 60%, which can be used in chemical industry, medicine and light industry.