Urban greening is inseparable from trees, street trees are the basis of greening, and the choice of tree species is directly related to the effect of urban greening. According to my own working experience, the author briefly introduces the types of street trees in northern China.

1. Ginkgo biloba: A deciduous tree of Ginkgoaceae, with straight trunk ends and oval crown, which is dioecious. Autumn leaves are fan-shaped and golden yellow. Cold-resistant and light-loving, with deep roots and strong tillering ability, it likes to grow in sandy loam with humid climate, deep and fertile soil layer and good drainage. Saline-alkali land, clay and low-lying land are not suitable for planting, with strong drought resistance and long life. Propagation by sowing, cutting, tillering and grafting. A large deciduous tree of Metasequoia family, with a narrow cone crown when young, wide oval branches when old, and linear, flat and tender green leaves. It grows fast, likes light, is cold-resistant, has strong adaptability, the groundwater level is too high, and the low wetland with long-term stagnant water grows badly. Saline-alkali tolerance (salt content below 0.2%) and certain sulfur dioxide resistance. Sowing and cutting propagation.

2. Ligustrum lucidum: an evergreen tree of Oleaceae, with spreading branches, inverted oval crown, leathery leaves, opposite panicles, small white flowers in June and dense fragrance. Drupe oval, slightly curved, ripe from 0. 1 1 to 12, deep purple blue. Warm soil positive tree species, after long-term cultivation, like warm climate, slightly tolerant to shade, strong adaptability, rapid growth in moist and fertile slightly acidic soil, developed roots, strong tillering germination, and resistance to pruning and shaping.

3. Magnolia grandiflora: an evergreen tree of Magnoliaceae, with a broad conical crown, hairy rust-colored buds and branchlets, long oval, obovate, leathery, dark leaves, shiny back, thick petiole, cup-shaped flowers, white, fragrant and purple filaments, aggregate fruit cylindrical oval, densely covered with rust hairs and red seeds. The flowering period is from May to August, and the fruit ripens at 60. Like sunshine, like warm and humid climate, but also has a certain degree of cold resistance, not resistant to dry and calcareous soil, strong resistance to various natural disasters, deep roots, but also resistant to smoke and dust. It can be propagated by sowing.

4. Cedar: A large evergreen tree of Pinaceae, with straight trunk, majestic, dioecious, irregularly rotating branches and drooping branchlets. I like sunny, humid and cool environment with deep soil layer and good drainage, and I can also grow in sticky loess and barren dry land. Acidic soil and slightly alkaline soil can adapt, but waterlogged depressions or places with too high groundwater level will not grow well or even die. Cedar has shallow roots and is easily blown down by the wind. Propagation by sowing, cutting and grafting.

Pinus bungeana: evergreen tree of Pinaceae, with sparse and horizontal branches, umbrella crown, green and beautiful. It likes light. It's cool. It grows well in calcareous soil, loess and semi-cloudy days with deep soil layer, and adapts to mild saline-alkali soil and calcareous soil. It can endure the cold of -30℃, but it is afraid of heat and water. Seed propagation.

5. Pinus armandii: evergreen tree of Pinaceae, with broad conical crown, smooth and hairless branchlets, small winter buds, cylindrical shape and chestnut brown. Leaves in a bundle of 5 needles, soft, conical and oblong. At maturity, seed scales grow, seeds fall off, and seeds are wingless or nearly wingless. The flowering period is from April to May, and the cone 9- 10 is mature. Positive trees, like mild and humid climate, have strong cold tolerance, heat tolerance, alkali soil tolerance, and sow and reproduce.

6. Black pine: An evergreen tree of Pinaceae with orange branchlets, silvery white winter buds, horizontally spreading branches and a broad conical crown. Good light, like warm and humid maritime climate, strong wind resistance, sea fog resistance, drought resistance and barren resistance, waterlogging control, heavy saline-alkali soil and calcareous soil, and can adapt to barren hills, beaches and coasts. With developed root system and high transplant survival rate, it is one of the coastal greening tree species, which has strong sulfur dioxide resistance and is not affected by chlorine, and can be planted in polluted areas. Reproduce with seeds.

7. Chinese pine (Pinus tabulaeformis): an evergreen tree of Pinaceae. Its crown is tower-shaped or broadly oval when it is mature, and it is disc-shaped or umbrella-shaped when it is old. Its bark is gray-brown, scaly, with stout branches, long and round winter buds and reddish-brown tips. A cluster of leaves has 2 needles, orange-yellow male cones, green-purple female cones, oval and light brown seeds, which bloom in April and May and bear fruit in the following year. Strong positive tree species, robust and cold-resistant, can withstand low temperature of -30℃. The requirements for soil are not strict, it is drought-resistant and barren, and it is not salt-tolerant. Reproduce with seeds.

8. Castanopsis kawakamii: Sabina of Cupressaceae, with a pointed crown. Young trees are spiny leaves, whorled or opposite. With the growth of plant age, it gradually transits to scale shape, and the cone is nearly spherical, and it matures in April of the following year. Like light, but strong shade tolerance, cold and heat resistance, not strict with soil requirements. It can grow on acidic, neutral and calcareous soils and has certain resistance to soil drought and moisture. Sow and breed.

9. Populus tomentosa: a large deciduous tree of Salicaceae, with straight trunk, obvious central main branch and conical crown. Temperate tree species are fast growing, strong positive, cold-resistant, like cool and humid climate, grow poorly in warm soil, have lax requirements on soil, can grow in acidic to alkaline soil, and have certain resistance to toxic gases. Propagation by burying strips, cutting, grafting, leaving roots and tillering.

10, Populus davidiana: Deciduous tree of Salicaceae, with oval crown, smooth gray-green bark when young, gray-white bark when old, shallow longitudinal crack, cylindrical twigs, yellow winter buds, hairless leaves, oval or oval leaves, flowering in late March, and fruit ripening in April-May. Like light, but also a little shade-tolerant, like warm, cool and humid, relatively cold-resistant, but it doesn't grow well in warm soil, and it is not strict with soil, drought-tolerant, but not waterlogged, and has an early germination stage. It began to sprout in Beijing in March and soon spread its leaves. It can be propagated by cutting and sowing.

1 1, weeping willow: Deciduous tree of Salicaceae, up to 10 m, with broad obovate crown, slender and drooping branchlets, yellow-green flowers in March, dioecious, and mature capsules in April. Wet-born positive tree species like to grow in wetlands on both sides of the river bank and will not die after short-term flooding. High dry land and calcareous soil can also adapt. Early germination, late defoliation, fast growth, short life span, and gradually aging after 30 years. Cutting is the main breeding method, and seeds can also be used for breeding.

12, Salix: Deciduous tree of Salicaceae, with elliptic or obovate crown, straight or oblique branches and lanceolate or linear leaves. Like light, not tolerant of shade, like water and wet, tolerant of drought. It can grow on dry and barren sandy soil, low-humidity floodplain and weak saline-alkali soil, but fertile, loose and moist soil is the most suitable, but it does not grow well on sticky or heavy saline-alkali soil. Fast growth, strong germination, developed root system, long-term waterlogging resistance, dry skin and root gas, and dry germination in spring. Cutting is easy to take root, and it can also be propagated by sowing, layering and tillering.

13, Pterocarya stenoptera: Deciduous tree of Juglandaceae, with flaky pith on its branches, naked buds densely covered with brown hairs, overlapping sessile latent buds under it, pinnately compound leaves, wingless leaf axis, oblong shape, serrated edge, drooping fruit sequence, nearly spherical nut, fruit wings 2 oblong or oblong-lanceolate, 2 cm to 3 cm long, obliquely spreading, flowering in April-May. Like light, like warm and humid climate, but also relatively cold-resistant, lax on soil requirements, deep roots, obvious taproots, developed lateral roots, strong tillering. Seed propagation.

14. Ulmus pumila: Deciduous tree of Ulmaceae, 25 meters high, with dark gray bark, longitudinal crack, rough, gray branchlets, slender leaves, oval leaves, sharp tips, flowering before leaves in early spring, samara nearly round, and seeds located in the middle of samara. The flowering period is from March to April, and the fruit ripening period is from April to June. I like light, cold and drought, and have strong adaptability. I like fertile, moist and well-drained soil, and I am not resistant to water and humidity, but tolerant to drought, barren and saline-alkali soil. Fast growth, strong germination, pruning resistance, deep main roots, developed lateral roots, strong wind and soil conservation ability, strong resistance to toxic gases such as smoke and hydrogen fluoride. Mainly sowing and breeding, tillering can also be used.

Eucommia ulmoides Oliv : Deciduous tree of Ericaceae, with smooth spherical cap, no terminal buds, oval and oval leaves, narrow and flat samara, which blooms in April, opens in front of the leaves or puts them together, and the fruit matures in June 65438-June165438+1October. It likes light, is not tolerant to shade, has strong cold tolerance, can grow in acidic, neutral and slightly alkaline soil, and has certain saline-alkali tolerance, but it does not grow well in too wet, too dry or too barren soil. Shallow root system, developed lateral roots, strong germination and medium growth rate. Sowing, cutting, layering and tillering can also be used for root cutting.

16, Platanus acerifolia: a deciduous tree of Platanus, with a bell-shaped crown and palm-sized leaves, 3-5-lobed. Flowering in March-April, monoecious, aggregate fruit spherical, and fruit ripening in June 5438+ 10. Forward fast-growing tree species have strong stress resistance and a little cold tolerance, but they are easily blown down by strong winds due to poor root development. The requirements for soil are not strict, and it can resume growth after short-term flooding, with strong germination and pruning resistance. Sowing and cutting can be done.

There are also pears, Fraxinus mandshurica, Melia azedarach, Prunus purpurea and Sophora japonica. Acer truncatum, Acer truncatum, Acer truncatum, Albizia Albizia, Willow, Sophora japonica, Ginkgo, Metasequoia glyptostroboides, Magnolia grandiflora, Cherry Blossom, Sophora japonica, Xifu Begonia, Persimmon Tree, Cedar, Black Pine, Pinus tabulaeformis, Pinus densiflora, Bronze, Haizhou Changshan, tassel, Peach Blossom, Luanshu, Aesculus chinensis, Poplar and Birch.

This is a lesson plan, which mentions the division of main tree species and represents tree species. If you want to see the details, you have to read the book yourself. Because even if I send it to you, you won't understand it. Too much is too long.

What kind of tree species do you want? You can ask questions directly, so the answer is more detailed.