Solutions to the lignification of pears in Cao Hua

Among the seven kinds of rosewood in the national standard of mahogany, it is generally believed that the Vietnamese rosewood with the best wood quality is produced in Indo-China Peninsula, which is rich in Vietnam and Cambodia. The air-dried density is 0.94- 1.0 1g/cm3, and the heartwood color varies from reddish brown to purplish red brown, with black stripes. Another kind of better rosewood is bird's foot rosewood, which is produced in tropical areas of Indochina Peninsula, mainly in Laos and Thailand. Its air-dry density also reaches 0.96- 1.0 1g/cm3. Its heartwood color is similar to that of Vietnamese rosewood, often with dark stripes. Here is a detailed explanation of the big fruit rosewood and Indian rosewood with a long history of use in China.

Large-fruit rosewood, commonly known as Burmese rosewood, is the main raw material of rosewood in Qing Dynasty. Many classical furniture handed down from ancient times are made of big fruit rosewood, and many of them are fine. Rhoda rosewood is mainly produced in Myanmar, Thailand and Laos. Its wood grain is clear, and the heartwood is orange red, brick red or purple red, often with dark stripes; Visible scratches are obvious; After sawdust was soaked in water, the water was yellowish brown with little or no fluorescence. Wood fiber has a thick wall and a small and uniform structure. The material is hard and heavy, and the air-dry density is 0.80-0.86g/cm3. Because of its long and mellow aroma, people also gave it a good reputation-fragrant pear.

Indian rosewood, also called rosewood, is one of the traditional furniture materials in China. Deciduous tree, 20-25m high, with dark brown bark and straight trunk. Leaves alternate, odd pinnately compound, drooping. It is produced in South Asia, Southeast Asia, Solomon Islands and Papua New Guinea, with a small amount in Guangdong and Yunnan. The growth rings of Indian rosewood are obvious, the heartwood is reddish brown, crimson brown or golden yellow, and there are often dark stripes with different shades; After soaking sawdust in water, the water is dark brown and fluorescent. The air-dried density of Indian rosewood is 0.53-0.94g/cm3, so some scholars think that although this kind of wood is among the redwoods specified in the national standard of rosewood, most of it is classified as Yahua pear because its air-dried density does not reach the specified 0.76g/cm3. In this regard, the author believes that it can be dialectically viewed that those Indian rosewood whose air-dried density meets the national standard can be regarded as mahogany, while those that do not meet the standard are non-mahogany, which is also applicable to the judgment of whether the rosewood plantation belongs to mahogany.

There are also some interesting things about Indian rosewood: April is full of flowers and fragrant flowers, but the flowering period is short, which is known as the flower of the day; Because of its shallow roots, Indian rosewood can't stand the attack of strong winds and heavy rains, but it is extremely fertile, and it can be regenerated by burying broken branches again.