What pine trees are produced in Hanzhong? Variety and distribution of origin?

There are many kinds of pine trees produced in Hanzhong: Pinus armandii, Pinus tabulaeformis, Pinus bungeana, Pinus massoniana and Pinus Bashan. A mild and cold climate. Some cold-resistant Pinus armandii, also known as White Pine and Five Hu Song, can be planted in Qinling-Bashan Mountain area and some mountainous hills in Weibei. The annual average temperature should be lower than 15℃, and the annual precipitation should be 600-1500mm. It has strong adaptability to soil and can grow on mountain cinnamon soil, red yellow soil and red lime soil. However, the requirements for soil moisture are strict, and it is not resistant to drought, barren, saline-alkali and poor drainage. Pinus armandii is cold-tolerant, and can grow normally at the low temperature of -7- 10℃ or at the absolute low temperature of -3 1℃. Huashan pine tree is tall, with green needles and many cones. It is also a kind of dried fruit tree with rich nutrition and delicious taste. Pinus massoniana, also known as Pinus massoniana and Cunninghamia lanceolata, is the main afforestation tree species in subtropical areas. At present, it can only be planted in Bashan and some places on the southern slope of Qinling Mountains. Suitable for warm and humid climate, it grows in the place where the annual average temperature is 13-22℃ and the annual precipitation is more than 800 mm, and it is not tolerant to low temperature. Young tree needles will wither in winter at-15℃. Pinus massoniana is not strict with soil requirements, is drought-resistant and barren, and can grow in clay, sandy soil, gravel soil and thin soil layers or cracks on sunny slopes. I like acidic and slightly acidic soils, and the mountains with PH value of 4.5-6.5 grow best. Pinus massoniana, with its fast growth, long life, strong adaptability, tall and straight tree potential and majestic vigor, is not only the main pioneer tree species for afforestation in barren hills, but also an excellent tree species for creating scenic forests and convalescent forests. Pinus tabulaeformis, also known as Pinus tabulaeformis and Pinus thunbergii, has the widest adaptability and can grow from south to north in Shaanxi Province. It is the best pine variety to adapt to continental climate.