Classification Pinaceae, Pinus genus.

Geographical distribution It is native to the mountainous area in central Honshu Island, Japan. It is cultivated from Qingshan Forest Farm in Linkou County, Heilongjiang Province in the north, to Chengbu County in Hunan Province and in the high mountains of Leibo County in Sichuan Province in the south. There are 14 provinces (regions) in total, covering a vast area ranging from 26°20′ to 45°15′ north latitude and 101°28′ to 130°50′ east longitude. Northeastern my country is mainly planted in mountainous areas with an altitude of 200 to 500 meters. In the Qinling Mountains, Daba Mountains and western Sichuan Province, the main planting areas are in mountainous areas with an altitude of 1200 to 2100 meters. In addition, it has also been introduced or cultivated on a large scale in southern Shanxi Province, Zhaowuda League in Inner Mongolia, Qinling Mountains in Shaanxi Province, Liupanshan Forest Area in Ningxia Hui Autonomous Region, Longdongnan counties in Gansu Province, and Yili in Xinjiang.

Biological and ecological characteristics Japanese larch is a shallow-rooted tree species and is not wind resistant. It is a positive tree species and cannot tolerate shade from above, but it likes a cool and humid climate and has high requirements for fertilizer and water conditions. Generally, it grows best on shady slopes and semi-shady slopes with deep and fertile soils with a slope below 30°. It grows well on slightly acidic loamy soils in mountains where granite, gneiss, and felsite are the parent material. The introduction area of ??Japanese larch can be divided into 5 geographical areas: Changbai Mountain-Liaodong District, Shandong Hilly Area, Northern Hebei Mountains, Qinling Mountains and Daba Mountain-Qionglai Mountains.

Afforestation technology is based on excellent family lines to establish ear picking nurseries to produce ear strips and carry out cutting and seedling cultivation. Larch cuttings must be supported by a matching all-light automatic spray device, otherwise the goals of high-efficiency production and large-scale seedling cultivation will not be achieved. The Chinese Academy of Forestry Sciences has designated production of this equipment. Coarse river sand is suitable for cutting, and the bed surface needs to be sterilized before cutting. In spring, seedlings are grown by cuttings from germinated hard branches. Cuttings from non-germinated hard branches take root very slowly and have a low survival rate. Therefore, spring cuttings should be harvested when the leaves expand to about 1/3 of the normal size. When harvesting, the base section of the branches is 2 to 3 inches. centimeters are left on the mother branch to facilitate the re-germination of new branches. Make the cut fringe material into 10-12 cm long cuttings, tie the base of the fringe into small bundles evenly, hang the serial number of the mother tree, and immerse the base in an IBA solution with a concentration of 0.01% for 20-30 minutes, or Use 1.0% IBA talcum powder to quickly dip the cuttings. In summer, use semi-lignified cuttings of current-year new shoots to raise seedlings. Harvest the ears when the current-year new shoots are 10 to 15 centimeters long and the base has become lignified. Strive to plant early, so ensure that the ear picking garden has a sufficient supply of water and fertilizer in spring. When picking ears in summer, you should not cut off all the ear strips on the mother plant, which will cause the mother plant to wither. You can only selectively cut off the sprouting branches of the mother plant that have reached the length standard to make cuttings. Leave those with insufficient length. Let it continue to grow for cuttings next spring. In the first month after cutting, if it is sunny, spray water once every 3 to 5 minutes from 8:00 to 18:00, and rotate the spray arm 2 times each time. After 4 weeks, the spray can be changed to once every 5 to 7 minutes until the rooting stage. The principle of spraying should be adhered to multiple times and in small amounts, so as not to make the soil too hydrated, but also to keep the water film on the leaves. Sterilization is another important task to ensure the success of cuttings. In summer, twig cuttings are particularly prone to mildew and must be sterilized regularly. Before cutting, use 0.3% potassium permanganate or other fungicides to sterilize the cutting soil. After cutting, you still need to spray fungicides to sterilize the ear strips. From now on, it will be sterilized regularly every 7 to 10 days in the evening after the water is stopped. Clonal seedlings are used for afforestation, and excellent families can also be used for direct afforestation. In northern my country, the hole planting method is mostly used for afforestation in spring, and biennial transplanted seedlings are often used. Container seedlings can also be used for afforestation. The distance between rows of afforestation plants is about 2 meters × 2 meters.

Economic value Japanese larch has fast growth, high yield, good material and wide use, and can be used for construction, paper making and other materials. Chemicals such as turpentine, alcohol, and cellulose can be extracted from its wood.