Green planting requirements

Seven key points of road greening planting design;

1, Green Belt Design of Street Trees

The planting of green space for street trees should be based on street trees, and trees, shrubs and ground cover plants should be combined to form a continuous green space; When the green belt of street trees cannot be planted continuously on the road with more pedestrians, breathable pavement should be adopted between street trees, and the tree pool should be covered with tree pool grates. The planting spacing of street trees should be based on the crown width of the tree species in its prime, and the minimum planting spacing should be 4 m; The minimum distance from the center of the trunk of the street tree to the outside of the kerb should be 0.75m; The DBH for planting roadside tree seedlings shall be not less than 5cm for fast-growing trees and not less than 8cm for slow-growing trees. Within the triangle of sight distance at road intersections, the green belts of street trees should be configured in a transparent way.

2, parking lot greening design

Tall shady trees should be planted around the parking lot, and green belts should be planted for isolation and protection; In the parking lot, it is advisable to plant tall shade trees in combination with parking spaces; The shade trees planted in the parking lot can choose street trees. The height under the branches of trees should meet the requirements of the clear height of parking spaces, that is, 2. Small car Sm, 3. The medium-sized car is 5m, and the truck is 4.5m.

3, road greening and overhead lines

Overhead lines should not be set above the car green belt and the street tree green belt; Must be set, should ensure that there is no less than 9m tree growth space under the overhead line; Trees configured under overhead lines should choose open-crowned or pruning-resistant trees; The minimum vertical distance between trees and overhead power line conductors shall comply with relevant regulations.

4, road greening and underground pipelines

The minimum horizontal distance between greening trees and the outer edge of underground pipelines shall comply with the relevant provisions for new roads or roads that have reached the planned red line width after transformation; No pipeline shall be laid under the green belt of street trees.

5. Selection of tree species and ground cover plants

Road greening should choose plant species that adapt to road environmental conditions, grow stably, have high ornamental value and good environmental benefits; In cities in cold and snowy areas, deciduous trees should be selected for planting green belts and street trees; Street trees should be selected with deep roots, high branching points, large crown, shade, strong growth, adaptability to urban road environmental conditions, and no harm to pedestrians due to fruit drop; The flowering shrubs should be lush, long-lasting, robust and easy to manage.

Hedgerow plants and foliar irrigation should choose trees with strong germination, dense branches and leaves and pruning resistance. Ground cover plants should be woody or herbaceous foliage and flowering plants with dense stems and leaves, strong growth potential, few pests and diseases and easy management, and lawn ground cover plants should be selected with strong germination, high coverage, pruning resistance and long green period.

6. Green belt design of split car.

The plant configuration of green belt should be simple in form, neat in tree shape and consistent in arrangement; The distance from the center of the trunk to the outside of the curb of the expressway should not be less than 0. The green belt in the middle of 75m should block the glare of the opposite vehicle. In the range of 0. 6 ~ 1. At a distance of 5m from the road where adjacent vehicles are driving, the plant crown should be covered with leaves all the year round, and the plant spacing should not be more than 5 times of the crown width. If the width of green belts on both sides is greater than or equal to 1. 5m, mainly trees, trees, shrubs and ground cover plants are combined, and the crowns on both sides do not overlap above the motor vehicle. If the width of green belt is less than 1. 5 meters, mainly planting shrubs, shrubs and ground cover plants combined. The end of the green belt separated by crosswalks or road entrances and exits should be arranged in a transparent way (that is, the crown of trees arranged on the green belt is 0. 9 ~ 3.0m away from the adjacent vehicle pavement).

7, road greening and other facilities

The minimum horizontal distance between trees and other facilities shall comply with relevant regulations.