Pinus tabulaeformis is as high as 25 meters; Bark is grayish brown, lobes are irregularly thick, and cracks are reddish brown. Annual branches are thick, grayish yellow or reddish brown, and slightly powdery when they are young; Winter buds are cylindrical, sharp, reddish brown, and the edge of bud scales is filiform. A bunch of needles, 6.5 ~15cm in length and1.5mm in diameter, without distortion, with fine serrations on the edges and air holes on both sides; Leaf sheaths are light brown, persistent and annular. The cone is ovoid, 4-9 cm long, green, grayish brown when mature, and remains on the tree for several years; Seed scales woody, thick, persistent. The upper scales are oblate rhomboid with obvious transverse ridges. Scales and navel are prickly and do not fall off. The seeds are brown, ovoid, 6 ~ 8 mm long, 4 ~ 6 mm in diameter, and the wing length is 15 ~ 18 mm. The flowering period is May, and the fruiting period is from September to 65438+1October of the following year.
Masson pine is 30 meters high. The trunk is straight. The bark is dark brown and irregularly cracked. Branchlets are green and replace the functions of leaves, which are called leaflike branches. The leaves degenerate into scales, and 6 ~ 8 scales are attached to each node. Flowers unisexual, monoecious or dioecious. Aggregate fruit oval, pubescent outside. Nuts have wings. Hi, Guangming. I like hot weather. Like calcium and magnesium, it is salt-tolerant and barren soil. Resistant to drought and humidity. The root system of Casuarina equisetifolia has rhizobia, which is the main reason for its rapid growth in poor sandy soil. Casuarina equisetifolia grows rapidly, has strong wind resistance, is not afraid of sand burial, and is salt-tolerant It is an excellent tree species for windbreak and forest fixation in the southern coastal areas of China. Strong positive, like hot climate, drought-resistant, barren-resistant, salt-resistant, wet-resistant, not cold-resistant. It grows fast. The 15-year-old tree cultivated in Guangdong is more than 20m long and has a short life span, that is, it will age in 30-50 years. Usually seeds propagate, and semi-mature branches can also be used for cutting. This tree species is the most suitable tree species for afforestation in coastal areas of South China, which can be planted in sandy land and coastal areas with good wind-proof and sand-fixing effects. It can also be used as street trees, shelterbelts or hedges in cities and suburbs. It is best to inoculate rhizobia during afforestation, which helps to resist high temperature, drought and barren conditions, thus improving the survival rate and promoting the growth of seedlings. Container seedlings have higher survival rate and faster growth than bare root seedlings, and are widely used in production. The main disease is bacterial wilt, and witches' broom disease has been found in recent years. Pests include Casuarina equisetifolia, cotton locust and Casuarina equisetifolia.
Black pine evergreen tree, up to 30 meters high, with gray-black bark. Two needles are clustered, thick, and the new buds are white. Each needle is about 6 ~ 15 cm long, and its cross section is semicircular. There are three resin pipe in mesophyll, and the leaf sheath consists of more than 20 scales, about 65438±0.2cm long. April flowers, single flowers. The female flower is born at the top of the new bud and is purple. Most kinds of scales (carpels) are arranged in a spherical shape. Each species has two bare blastomeres at its base. The base of male peanut buds is yellow, and most of them are male. When they mature, most of the pollen floats out with the wind. In the autumn of the following year, cones were formed, scales cracked, seeds scattered and seeds with thin wings.