Albizia Albizia has graceful posture and elegant leaf shape. In midsummer, it is full of velvet flowers, colorful and fragrant. Suitable for planting on the edge of forest, lawn, in front of building or hillside, and also a good material for shade trees and street trees.
Albizia Albizia is a deciduous tree, with a height of 16m, a oblate crown and an umbrella shape.
The bark is grayish brown, undivided, and the trunk is not high, which is a hinged branch.
Leaves alternate, with 2 even-numbered compound leaves and 4 ~ 12 pairs of pinna, each with 10 ~ 30 pairs of leaflets; Leaflets are sickle-shaped, midvein is obviously biased to one side, and midvein on the back of leaves is hairy.
Inflorescence head-shaped, slender stalks, arranged in corymbose inflorescences, axillary or terminal, with pink flowers, such as velvet tassels.
The fruit has long flat pods and flat seeds.
Flowering in June-July, fruit ripening in September-65438+1October.
Common cultivated tree species include Albizia macrophylla, Albizia albiflora, Zelkova schneideriana, Zelkova schneideriana and so on.
He likes light, but the trunk is afraid of strong light because of its thin skin, otherwise it will crack easily; Cold tolerance is not strong, so it should be planted in the plains or low mountainous areas with good microclimate in North China; The requirements for soil are not strict, arid and barren sandy soil can grow, and it is salt-tolerant but not waterlogging-tolerant.
It grows fast in wet, fertile and well-drained places, and grows slowly in poor conditions.
Because there are rhizobia in its roots, it can improve soil and improve soil fertility, and it is a pioneer tree species for greening sandy land and saline-alkali land.
Albizia Albizia is a coaxial branch with weak dryness, spreading branches, low branches and easy bending of the trunk.
Fast growth, poor germination, but strong branching, not resistant to pruning.
Albizia Albizzia, whether as a street tree, single plant or group plant, is more suitable to adopt the form of leaderless trunk.
The key to plastic surgery is to cultivate a straight trunk.
Because the trunk of seedlings is often inclined and the branches are too low, in order to make the trunk straight and the branch points suitable, the seedlings can be planted reasonably close or intercropped with crops in Gao Qian.
If the growth potential of the trunk is not strong at seedling stage, it should be shortened in time, and the upright branches with strong buds should be selected to replace the trunk extension, and attention should be paid to pruning the strong side branches and straightening the trunk extension.
Weak seedlings can be cut (turned back) in the second year, which will promote the emergence of healthy and straight trunks.
In the spring of the following year, when the new branches growing obliquely outward under the cutting mouth are about 20 cm long, the branches with vigorous growth at the upper end and vertical growth along the trunk are selected as the trunk extension branches, and several new branches nearby are cut off to reduce the influence on the growth of the trunk extension branches.
In the vigorous growth period, other branches must be pruned 2 ~ 3 times to ensure the growth advantage of the main extension branches.
After that, the pruning in winter every year is the same as that in the previous year, and the trunk extension branches, auxiliary branches and temporary branches left in the middle and lower parts can be properly thinned out.
At the same time, several layers of branches are left above the extended branches as auxiliary branches to control the growth potential of branches on the main trunk in summer.
When the height of the trunk exceeds 2 meters, it can be fixed.
The plastic zone of Albizia Albizia is generally 2 ~ 2.5 meters.
Because there are not many candidate skeleton branches of Albizia Albizzia, we should pay attention to choosing three skeleton branches with good orientation. These three main branches should be spaced at a certain distance, and the spacing between branches should be as large as possible. After the main branch is selected, the middle part of the third main branch should be cut off, and the crown can be expanded only by these three oblique branches, which takes about 4 years to form.
In the future, pruning is mainly to shorten three main branches in winter, and cultivate several side branches on each main branch at the same time. The side branches should be scattered and occupy a certain space.
At the same time, the lateral branches must maintain an obvious subordinate relationship from bottom to top.
In the future, the tree will continue to swell, and short pruning can be stopped.
The maintenance and pruning of Albizia Albizia is relatively simple, and it is usually based on sorting out miscellaneous branches, paying attention to thinning dead branches, too dense branches, pests and diseases, cross branches and so on.
When the branches are too long and the lower part is bald, they should be retracted by changing their heads and should not be cut short.