The southwestern birch is the southernmost tree species of birch family. The tree is tall, dry and straight, with small sharpness, fine and fine material, wide adaptability, rapid growth and easy natural regeneration. It is the secondary forest of evergreen broad-leaved forest. Pioneer species and important timber species.
The growth of Betula platyphylla is rapid, and it is another excellent fast-growing precious tree species after eucalyptus. It is mixed with negative or neutral shade tree species, such as red needle, wood lotus, fragrant incense, eucalyptus, fir and many other coniferous and broad-leaved species. Wide, wide-broad mixed forest, not only grows well, but also has good forest structure, strong protective performance and good ecological effect. Due to this characteristic, the southwestern birch is also used as furniture.
Characteristics of the southwestern birch wood
After being dried, the birch wood is not cracked, the shrinkage ratio is small, the deformation is not easy, and the pattern and color are beautiful. In addition to traditional furniture, construction and military applications, it is commonly used as plywood, high-grade furniture, wood flooring and interior decoration materials; Good performance and excellent instrumental materials. In addition, the southwest birch wood has been widely used as a precious material. Its wood is light reddish brown, slightly lustrous, and the mechanical strength is medium to high. The hardwood structure of birch wood is fine and flexible, and the processing performance is quite good. It is often used for solid wood carving. Partially; birch has a smooth planing surface and good paint and adhesive properties.
However, the southwestern birch also has certain shortcomings. Birch growing in the northern hemisphere has a shiny surface and a smooth mechanism; yellowish white is slightly brown, the annual rings are obvious, the wood is pure, slightly hard, fine structure, strong mechanical strength, elastic, hygroscopic, dry It is easy to crack and warp; it is not very durable in the environment of easy decay, and it is more used in the form of splint, but for the wet southern weather, if the process is proper and the maintenance is appropriate, it is not fatal. In addition, the birch in the northeastern part of the northeast of China, the wood is fine and pale yellowish, and the fiber has poor shear resistance, which is easy to “snap offâ€.
The southwestern birch is quite fast-growing. Under natural conditions, it can be used in 20 to 30 years.
The southwestern birch wood is not warped or cracked, has a small dry-shrinkage ratio, is not easily deformed, and has beautiful patterns and colors. It is commonly used as plywood, high-grade furniture, wood flooring and interior decoration materials in addition to traditional furniture, construction and military applications. Its resonance performance is good, and it is also an excellent instrument material. The bark contains 6.9 to 11.6% of tannin and can be extracted from tannin.
It is common in secondary forests and roadsides at 800-1500 meters above sea level. It is distributed to the lowest elevation of 500 meters in the border and estuary. The lowest distribution in the southeastern part of Funing can reach 200 meters above sea level. The highest distribution is found in Xinping County. Overseas, the altitude has reached 1,900 meters. It often grows in groups in its distribution area, or forms a small piece of pure forest. The southwestern birch warm and hot climate, the extreme maximum temperature in the distribution area of ​​Yunnan Province is 37 ~ 41 ° C, but the winter leaves, can withstand a certain degree of low temperature and frost, according to the available data, generally canlerate short-term -4 ~ -6 ° C Low temperature without damage. The center of the distribution of Betula platyphylla is the tropical north margin and the southern subtropical zone. Within this zone, it has a wide adaptability to water-wet conditions. It is moist and slightly resistant to drought. Except for the dry-hot valley area, the annual average relative humidity is More than 70%, the water heat coefficient of 1.5 or more can grow. It grows best in moist evergreen broad-leaved forests.
Pet Electronics Toys,Cat Electronics Toys,Electronics Toys
Ningbo XISXI E-commerce Co., Ltd , https://www.petspetsproducts.com