Road greening refers to planting trees, flowers and plants and road shelterbelts on both sides of the road and in the isolation belt. Urban road greening is an important part of urban garden green space system and one of the important symbols of urban civilization. So when it comes to road greening mode, what is the basic situation of conventional road greening mode at this stage? The following is the basic information of Zhong Da's consultation:
Plant configuration of urban trunk roads
Urban trunk roads have three functions: realizing traffic, organizing street scenes and improving microclimate, which affect urban landscape space and landscape sight with rich landscape effects, diverse green forms and changeable seasonal colors. Urban trunk roads are divided into general urban trunk roads, landscape recreation trunk roads, protective trunk roads, expressways, elevated roads and other types. The greening design of all kinds of urban trunk roads should follow ecological principles, arrange plants according to aesthetic characteristics and human behavior recreation principles, and reflect their own characteristics. Plant configuration should have its own characteristics according to different locations.
(1) Plant Configuration of Landscape Recreation Trunk Road
The plant configuration of scenic and recreational trunk roads should give consideration to their ornamental and recreational functions, and design the road for tourists to participate in sightseeing from the perspective of human needs and the naturalness and systematicness of plant communities. There is a green belt with a width of 2 1 m in the middle of Zhaojiabang Road, which is known as "City Avenue". A large number of tall trees such as Cinnamomum camphora, Cedar, Metasequoia glyptostroboides and Ligustrum lucidum are planted, and various shrubs and flowers are arranged under the forest. At the same time, leisure trails are set up in the green space, and various sculptures and garden sketches are dotted among them to play their ornamental and leisure functions.
(2) Plant configuration of protective trunk roads
High-rise buildings on both sides of roads and streets form long and narrow valleys under the urban atmosphere, which is not conducive to the emission of automobile exhaust, directly endangering pedestrians on both sides and residents in the building, and is quite harmful to people. Road greening with isolation and protection as the leading function mainly plays its function of isolating harmful and toxic gases and noise, and takes into account the ornamental function. Plants with anti-pollution, anti-pollution, dust retention and noise absorption, such as cedar, Sabina vulgaris, osmanthus fragrans, coral trees, oleander and so on. In the greening design, the transition from arbor community to small arbor community, shrub community and lawn is adopted to form a three-dimensional layering, which plays a good protective role and landscape effect.
(3) Plant disposition in expressway.
Good highway plant configuration can reduce the driver's fatigue, and rich plant landscape also brings passengers a relaxed and pleasant journey. The greening in expressway consists of central isolation belt greening, slope greening and interchange greening. The central isolation belt generally plants trees in rows to avoid the shadow projected on the driveway from disturbing the driver's sight. The greening in expressway consists of central isolation belt greening, slope greening and interchange greening. Generally, trees are planted in no rows in the central isolation belt to avoid the shadow projected on the driveway from disturbing the driver's sight, and trees with too large crown are not suitable for selection. Large color block pattern green belts with rich visual rhythm can be planted in the isolation belt. There should not be too many plant varieties, too bright colors, too high repetition frequency and too strong sense of rhythm in the green belt. Generally, it can be repeated every 30-70 meters according to the width of the isolation belt, and 3-6 kinds of color block shrubs can be selected, and various flowering or evergreen plants can be planted in the middle to enrich the landscape.
The main purpose of slope greening is to stabilize soil and protect slope and prevent erosion. Plant configuration should try not to destroy the natural terrain and vegetation, and choose tree species with developed roots, easy survival, convenient management and landscape effect.
Interchange greening is located at the intersection of expressway, and it is easy to become the focus of people's vision. There are two main forms of greening: one is a large-scale pattern, and flowers and shrubs are planted according to different linear patterns to form a simple plant landscape. The other is the landscape mode of nursery. The artificial plant community is planted in the form of arbor, shrub and grass with high density. It not only plays its ecological and landscape functions, but also gives consideration to its economic functions, which provides a strong guarantee for the seedlings needed for urban greening development.
(4) Plant disposition of roads in garden green space
Garden road is the skeleton of the whole garden, which has important functions such as organizing tour routes and connecting landscape areas. Whether in the choice of plant varieties or in the form of collocation (including color, level, size, area ratio, etc.), the configuration of road plants is more diverse, free and vivid than that of urban roads. ).
Garden roads are divided into main roads, secondary roads and paths. The greening of main roads often represents the image and style of green space, and the plant configuration should be attractive to form the momentum and atmosphere consistent with its positioning. For example, large and tall trees such as Platanus acerifolia, Cinnamomum camphora, Du Ying and Zelkova schneideriana are planted at regular intervals on the main road at the entrance, and plastic shrubs such as azaleas, safflower and cypress are planted under them, which is lively and full of rhythm, forming a magnificent main road landscape. The secondary trunk road is the main road of each district in the park, generally 2 ~ 3 meters wide; The path is for tourists to stroll in the quiet rest area, generally only 1 ~ 1.5 meters wide. The secondary roads of green space often have twists and turns, and the plant configuration should be natural. Visually, roads should be sparse and dense, high and low, covered and open. There are lawns, flowers, shrubs, bushes, solitary trees and so on. Visitors can walk along the road across the lawn, take a nap in the forest, or walk through the flowers to enjoy the flowers. Youzhu Path is a common landscaping technique in traditional gardens in China. Bamboo grows rapidly, has strong adaptability, is evergreen all the year round, is delicate and upright, has cultural connotation, and can still be seen in modern green spaces.
Layout form of urban road greening
The layout of urban road greening is also varied, among which section layout is the main way used in planning and design. The commonly used forms of urban road greening are:
(1) One board with two belts. This is the most commonly used form of road greening, that is, planting street trees on the sidewalk separation lines on both sides of the roadway. The method is simple to operate, saves land and is convenient to manage. When the roadway is too wide, the shading effect of street trees is poor, which is not conducive to traffic management when motor vehicles and non-motor vehicles are mixed.
(2) Two boards and three belts. The middle of the two lanes separated by one-way driving is afforested, and street trees are arranged on both sides of the road. This form is suitable for wide roads, with a large number of green belts and remarkable ecological benefits, and is mostly used for the greening of expressway and sidewalks.
(3) Three boards and four belts. The lane is divided into three parts by two independent lanes, with a motor vehicle lane in the middle and non-motor vehicle lanes on both sides. Together with the street trees on both sides of the driveway, there are four green belts. Although this way covers a large area, it has a large amount of greening, good shading effect in summer, convenient traffic organization, safety and reliability, and solves the contradiction of mixed interference of various vehicles.
(4) Four boards and five belts. The lane is divided into four lanes by three isolation belts and planned as five green belts, so that the up and down of various vehicles do not interfere with each other, which is conducive to speed limit and traffic safety; If the road area is not suitable for the fifth district, it can be separated by railings to save land.
(5) Other forms. According to the geographical location and environmental conditions of the road, green belts are set up according to local conditions, such as the greening design of hillsides and waterways.
As the main part of the city, road greening plays an increasingly prominent role in the construction of modern cities, which is also directly related to the spiritual connotation of a city. Therefore, urban road greening should be regarded as a key issue in urban construction. I believe that as long as we can make more efforts on this issue, the urban road construction in China will be brand-new, the urban landscape will be developed and the urban connotation will be enhanced.
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