Cedar, Cupressus of Cupressaceae.

Cedar, with a height of 35 meters and a DBH of 2 meters; Bark light brown gray, divided into narrow strips; Branchlets slender and drooping. Scaled branchlets are flat and arranged in a plane, with the same shape on both sides, green and about 1 mm wide. The old branches are cylindrical, dark brown and purple, and slightly shiny.

Scale leaf type II, with a length of 1 to1.5mm, a sharp apex, strip-shaped glandular spots on the back of the middle leaf, folded leaves on both sides and ridges on the back. Male cones are ovoid or ovoid, 2.5-3 mm long, usually with 6 pairs of stamens. Connectors are short at the top, with longitudinal ridges in the middle and light green and brown edges. The female cone is 3 to 6 mm long, subglobose and about 3.5 mm in diameter.

The cone is spherical, with a diameter of 8 ~ 12 mm, and dark brown when mature; 4 pairs of seed scales, irregular pentagonal or square at the top, 5-7 mm wide, with 5-6 seeds in the middle. Seeds broadly obovate-rhombic or suborbicular, flat, light brown and shiny when mature, about 2.5 mm long, with narrow wings at the edge; 2 cotyledons, strip-shaped, 8 to 65438 0.3 mm long, 65438 0.3 mm wide, with obtuse top; Primary leaves are flat and spiny, 5 to17mm long and 0.5mm wide. At first, it was the opposite, and the last four impellers were born. The flowering period is from March to May, and the seeds mature from May to June of the following year.

Cedar enjoys a warm and humid climate, and grows well in places where the annual average temperature is 13℃ to 19℃ and the annual rainfall is above 1000 mm, with a relatively uniform distribution and no obvious dry season. It has wide adaptability to soil and can grow on neutral, slightly acidic and calcareous soil. Drought and barren resistance, and a little water and humidity resistance, especially in the upper light calcareous purple soil and calcareous soil can also grow normally. It needs enough light from above to grow, but it can withstand the lateral shade. The taproot is shallow and thin, and the lateral root is developed. Strong cold tolerance, rarely frostbite.

I like to grow in warm and humid soil areas, especially calcareous soil in limestone mountainous areas. In northern Sichuan, along the Jialing River basin, Qujiang River basin and its tributaries, there are often lush pure cypress forests.

Cedar is a precious timber tree species, which is mainly used for high-grade furniture, high-grade decoration of offices and houses, and processing of wooden handicrafts. It is a multifunctional and efficient tree species, and cypress is not only an excellent tree species suitable for timber forest and ecological landscape construction; Moreover, cypress is a kind of tree species that can be used by the whole tree. Rich chemical products can also be extracted, and the economic value of comprehensive utilization is high. The branches, trunks and roots of cypress can be refined into refined cypress oil, and asphalt can be used as a variety of chemical products. The broken wood extracted from the root of cedar oil is crushed into powder and exported to Southeast Asia, which has high economic value.

In addition, it is easy to process, the cutting surface is smooth, and the brightness after painting is particularly good; Easy adhesion and strong nail grip. It is durable and can be used as a ship for hundreds of years. Known as the "cypress boat", it is durable. Among many classical buildings preserved in the south of the Yangtze River, cypress trees are mostly used for carving beams, foreheads, panes and screens. Also used as pencil poles, toys, farm tools, machine models, musical instruments, etc. Cedar is indeed a kind of multi-purpose and high-quality wood.

Because it contains resin, cypress wood dries slowly and has strong corrosion resistance. Whenever people step into the lush Berlin, look at its colorful branches, breathe the fragrance that secretes people's hearts, and think of the cold-resistant and evergreen characteristics of these thousand-year-old trees, it is easy to purify people's hearts. So we can see that the ancients used cypress as furniture. Cedar is yellow, thin, fragrant, water-resistant and knotty, so people often regard it as "cypress".

All parts of cypress (branches, fruits, roots and stems) contain oil. However, the oil content of the same tree species varies with the age of the tree, site conditions and cutting season.