Kang County is a green treasure land in Gansu. The forest coverage rate in the territory is as high as 84%. It is rare in China. In the dense forest, there are more than 700 species of higher plants in 172 families, among which the tree species suitable for the growth of edible fungi such as black fungus up to 4 There are 17 species of 6 genera, covering an area of ​​1.1 million mu. There are more than 600 large fungi growing in the forest, which provides a good ecological environment for the growth and reproduction of black fungus. Kangxian black fungus is an excellent strain selected from the natural growth of wild fungus in Kangxian County. The fruit body is colloidal, the ear shape is irregular, and the shape is more chrysanthemum. The meat is thick and thick, fresh and soft, and the horny and color after drying. Black brown. Kangxian black fungus is cultivated with segment wood. It is rich in cellulose, vegetable gum, fat and polysaccharide colloid. It is soft to the taste, lubricated, delicious and tender. It is a high-grade tonic and its nutrition is unique. The quality is well-known at home and abroad, and it is selling well in the market.

Kang County is located in the mountainous area of ​​southern Fujian. The climate is warm and rainy. The annual average temperature is 11 °C, and the annual average rainfall is 856 mm. It is the county with the most rainfall in Gansu. The county's forest area is 2.6 million mu, which is 47.7% of the total area. Especially the ear forests and red-green bar trees, which provide a wide range of conditions for the production of black fungus. Specific quality Kangxian fungus belongs to the species of Auricularia auricula. It has the characteristics of large flesh thick, black and smooth, soft texture, smooth and refreshing, and fragrant smell. It has been famous for more than 200 years and is sold in domestic and foreign markets. Nutritional value Black fungus is rich in nutrients and has the reputation of “the meat of the vegetarian diet”. According to analysis, each 100 grams of dry product contains 10.6 grams of protein, 0.2 grams of fat, 65 grams of carbohydrates, 358 milligrams of calcium, 201 milligrams of phosphorus, 185 milligrams of iron, 10.15 milligrams of vitamin B, vitamin B 20.55 milligrams, carotene 0.03 Mg. Li Shizhen, a pharmacist of the Ming Dynasty, wrote the medicinal functions of the fungus in the "Compendium of Materia Medica": "The fungus is born on the dead wood, without branches and leaves, is born of damp heat, and is ineffective in taking advantage of Qi, light body and strong. Gu Zhixuan." Modern medicine believes that: fungus is flat, sweet, with small poison, spleen and kidney two meridians, nourish the spleen and stomach, soothe the nerves and moisten the vitality, the effect of blood stasis, the main bleeding in the collapse, hemorrhoids bleeding, blood Sputum blood, waist and leg pain, hand and foot cramps, cardiovascular disease, arteriosclerosis, postpartum weakness and other diseases. In particular, it has been proved that the fungus has the special function of moistening the lungs and clearing the stomach and intestines, helping to digest fiber, and is a health food for textile workers, hairdressers and some mining workers. Modern medical research has found that fungus has certain anti-tumor activity.

Kangxian black fungus quality technical requirements (a) site conditions. The altitude of the protected area ranges from 560 meters to 1600 meters. (2) Production of substrates. The matrix is ​​a cork ridge and paralysis. (3) Strains production technology. 1. Varieties: "Kang 1", "Kang 6", "Kang 168". 2. Medium: The parent species is PDA medium; the original seed and cultivar medium are 78% wood chips, 20% rice or wheat bran, 1% sucrose, and 1% gypsum. 3. Sterilization: The parent, stock and cultivar culture media are sterilized by conventional sterilization methods. 4. Culture: Dark light culture at 24 ° C to 28 ° C. (4) Cultivation techniques. 1. Tree species: must be cork oak and paralysis. 2. Ear field: Choose leeward sun, long sunshine time, convenient drainage. 3. Tree cutting period: cut trees during the winter solstice to the Great Cold. 4. Segment wood moisture content: inoculation when reaching 35% to 40%. 5. Inoculation: Inoculate on the segment wood. The line spacing is 7 cm to 8 cm, the hole pitch is 6 cm to 7 cm, the hole depth is 1.8 cm to 2 cm, and the hole is drilled with a drill having a diameter of 0.8 cm to 1 cm. 6. Management: (1) Arrangement (Mianshan): Spread the inoculated section of wood in the ear field and turn the section wood once every 7 to 10 days to make the section wood evenly receive the sun and rain. (2) Lifting: When more than 80% of the inoculation points on the section wood grow ear buds (young ears), the ears are 3cm to 6cm apart, and the horizontal wood is 60cm to 80cm away from the ground. (3) Mowing: When the weeds in the ear field exceed 10cm, cut them off in time. (4) Turning the rod: After picking up a piece of black fungus, turn the ear stick over the face and re-arrange it. 7. Picking and drying: pick and dry at the right time. (5) Quality characteristics. 1. Sensory characteristics: The project requires that the ear color of the ear piece be dark brown to light brown. The ear should not exceed 1%, the ear should not exceed 0.5% smell and other flavors with black fungus. No odor, no loss of ears, insects and ears. Do not color, do not add chemicals. 2. Physical and chemical indicators: project indicators small size small ear can not pass the diameter of 1.0cm diameter mesh,% does not exceed 13 dry and wet ratio 1:12 or more ear thickness 0.1cm harmless impurities,% ≤ 1 crude protein,% Not less than 8.00 total sugar (in terms of invert sugar), % not less than 22.00 crude fiber, % 3.00-6.00 ash, % 3.00-6.00 fat, % not lower than 0.403. Safety requirements: product safety indicators must reach the national Product related regulations.

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Producers within the protection scope of Kangxian Black Fungus Geographical Indication Products may submit an application for the use of “Special Marks for Geographical Indication Products” to the Kangxian Quality and Technical Supervision Bureau of Gansu Province, which is approved by the General Administration of Quality Supervision, Inspection and Quarantine.