What are the street trees in Longyan city?

Road system is the infrastructure construction of modern society. Improving the application of road system, improving the quality of road service and choosing street trees have positive environmental and ecological functions.

Planting street trees on both sides of local sidewalks, dividing lines, green islands, public square trails, Binjiang Avenue and urban and rural roads. Starting from the requirements of street tree species selection standards and maintenance management, it should be the requirements of strong adaptability, less pests and diseases and good landscape performance, and should be the requirements of extremely dry branch display and lasting landscape.

As the network and skeleton of urban green space system, road greening has become the main component of system continuity elements, which directly reflects the prominent role of urban landscape. In application, the choice of street trees and urban roads is mainly deciduous and broad-leaved trees. Suburbs and general high-grade highways pay more attention to the factors of speed growth, pollution resistance, low cost, easy management and cost saving. The selection and application of street trees in corridors and slope memorial sites are mainly evergreen conifers, such as juniper, cypress, fir and pine. Selection of deciduous trees, willows and elms. In addition, palm trees are often selected for application. In recent years, with the improvement of urban environmental construction standards and green, clean and beautified environment, the application of selection is on the rise. At present, the commonly used street trees are Platanus acerifolia, Tilia amurensis, Ulmus pumila, Aesculus chinensis, Acer truncatum, Camptotheca acuminata, Ginkgo biloba, Liriodendron hybrid, Cinnamomum camphora, Magnolia grandiflora, Michelia Lechang, Ligustrum lucidum, bronze ware, poplar, willow, Sophora japonica, swimming pool, fir, fir and so on.

Street trees should be determined according to the standards of road construction and the surrounding environment, and appropriate types and varieties should be selected. If the power and communication lines are limited in the planned planting area, the growth height of the final tree species should be lower than the altitude of the overhead line. In order to save costs, regular pruning should be chosen. If you have enough funds, equipment, pruning training technicians and genealogy to maintain a high level of demand, you can choose tall trees, adopt correct pruning methods, and avoid the restriction of crossing the line to obtain satisfactory use. In addition, the branch point of the plastic planting tree is high enough, which will not hinder the normal walking of passers-by and vehicles, block the sight of pedestrians and passengers, and avoid accidents. Especially in areas with small turning radius and poor viewing angle, more attention should be paid. The standard selection of a tree should be appropriate, not exceeding the specific requirements of architectural landscape, volume and growth mode on both sides of the street, and can stand the test of time.

Decision-making environment for planting crown-shaped street trees in local area. Through the overhead line of the main road, you can use rules to crown the trees and trim the trees into cups or happy shapes. Ordinary roads or relatively narrow lanes are based on the shape of natural road arches. For the central leading tree species, such as poplar, oleander, Metasequoia glyptostroboides, Taxodium ascendens, etc., the height of lateral branches should be 2.5 to 3 meters at the bottom of the skirt. Under appropriate circumstances, sparse, especially in the sections with poor visibility and traffic bends, should be pointed out to broaden their horizons so as not to cause traffic accidents. Tree species under the leadership of the central government, such as willow, elm, locust tree, camphor tree, Ligustrum lucidum and Cinnamomum camphora, should control the height of branches to 2-3 meters, and the crown naturally forms a sphere. The cup-shaped pruning tree has a typical crown of "3 6 12 branches". The height of the trunk branch point should be on the overhead line, which does not interfere with pedestrians and vehicles, generally 2-3 meters. We should adjust the growth direction of crown branches in time every year, maintain a unified crown and painting, eliminate the interference of overhead lines, and take care of the safety and lighting of surrounding buildings. Pistachio pruning evolved into a cup, because there was no spindle and terminal bud to cut down the tree. Trim and leave 3-5 main branches in different directions and evenly distributed at the branch point, and choose to leave 2-3 side branches. The natural crown will make the main branch, but the hole is empty.

The trunk height of street trees should be relatively consistent. On the same road, narrow roads or large vehicles are more than 3 meters to 3.5 meters, wide roads or commercial pedestrian streets can be reduced by 2.53 meters, and the species branching angle can be appropriately reduced, but not less than 2 meters. The size of the tree should be as clean and tidy as possible, and the height should be uniform, so as to avoid the aesthetic effect and inconvenient management caused by the different thickness and size in the spread range.