Larch wood pile

Larch wood pileIt is a deciduous tree of the genus Larix in the Pinaceae family. It is the main forest component tree species in the forest areas of Northeast my country, Inner Mongolia, and the alpine coniferous forests in North China and Southwest China. It is one of the three main coniferous timber forest species in the Northeast. Natural distribution of larch It is very widespread. It is a cold temperate and temperate tree species. It is cold-resistant among coniferous species. Its vertical distribution reaches the upper limit of forest distribution. The main natural distribution and artificial cultivation of larch in northern my country include Xing'an larch and Landrace larch. , North China larch, Japanese larch into Korean larch.
A genus of Pinaceae. A deciduous tree with a straight trunk; branchlets grow regularly and alternately, divided into long branches and short branches. Leaves, bud scales, stamens, bract scales, pearl scales and seed scales are all arranged in a spiral shape. Leaves are on long branches. Scattered on the upper side, in clusters on short branches, oblanceolate linear shape, soft, with a somewhat raised midrib on the upper side, several stomata lines on the two sides of the lower side, and two resin canals that usually grow on each side in the leaves. Monoecious, female , the male cones are all solitary on short branches; the male cones have many stamens, each stamen has 2 anthers, the anther chamber is longitudinally split, and the pollen has no air sacs; the female cones are upright, with small scales, and 2 inverted at the base of the ventral surface. The ovule is born, with a large and conspicuous bract scale on the back. The cone is upright, mature in the current year, and usually purple-red when young; the seed scale is leathery and persistent; the bract scale is short and narrow, not exposed or slightly exposed, or the bract scale is It is longer than the seed scales, and the exposed part is straight, bent or reflexed; the seeds have long membranous wings, the base is wrapped by the seed wings, and the seed coat has no resin capsule.

Larch wood pileThe genus is divided into 2 groups based on the shape of the cones, the length of the bract scales and whether the branchlets are drooping: in the redwood group, the cones are cylindrical or ovoid-cylindrical, and the bract scales are longer than the seed scales or nearly as long, and are significantly exposed or exposed. The lower branches are drooping (domestic Tibetan redwood, Himalayan redwood, Nujiang redwood, redwood, large-fruited redwood, Sichuan redwood, and Taibai redwood belong to this group). The cones of the larch group are oval or long-oval. Shape, bract scales shorter than seed scales, not exposed or with pointed tips exposed, branchlets not drooping (national larch, yellow-flowered larch, North China larch, Siberian larch and introduced Japanese larch, European larch belong to this group).

　　
Larch wood pileThe trunk is straight, with few knots, and the difference between heartwood and sapwood is obvious. The material is tough, the structure is slightly thick, and the texture is straight. It is a wood with strong corrosion resistance and mechanical properties among Pinaceae plants. It is suitable for buildings, poles, and bridges. Used for boat carts, sleepers, springwood, ore pillars, furniture, appliances and wood fiber industrial raw materials. Arbor, up to 35 meters high, with a diameter at breast height of 90cm. The bark is gray, dark gray or grayish brown, with deep furrows and splits into pieces. The sapwood is peeled off, and the mark is purple-red; the cross section is dark brown after breaking; the skin is light red. The heart and sapwood are clearly distinguished. The sapwood is yellowish white with a slight brown color, and the heartwood is yellowish brown to tan. The growth rings are clearly separated. The wood shoots are light and fine. .The one-year-old branches are slender, about 1 mm in diameter, light yellowish brown or light brown, hairless or sparsely hairy, often with long hairs at the base, 2nd and 3rd year old branches brown, grayish brown or gray; short branches 2-3 in diameter mm, with nearly white long hairs at the advanced level; the winter buds are nearly round or oval, with dark brown bud scales and brown eyelashes on the edges. The leaves are oblanceolate and linear, flat, 1.3-3cm long, 0.5-1.0 mm wide, with a flat surface. , sometimes there are 1 or 2 stomata lines on each side, the midrib on the back is raised, and there are 2 or 3 stomata lines on each side. When the cone is mature, the upper scales are open and cup-shaped or oval, yellowish brown, light brown Or sometimes purple, 1.2-2.5cm long, 1-2cm in diameter, seed scales 16-30; the middle seed scales are ten thousand-pointed and oval, the back of the scales is hairless and shiny. The bract scales are shorter and the length of the seed scales is 1\/3-1\/2, egg-shaped, lanceolate, with the middle rib extended into a sharp tip. Seeds are obliquely oval, gray-white, with light brown markings, and are about 1cm long with wings; the middle and lower parts of the seed wings are wide, and the apex is skewed. ; Cotyledons 4-7. Flowering period is May-June, cones mature in September-October.