What are the selection principles of urban road greening plants?

First, the choice of urban road greening plants

The selection of urban road greening plants mainly considers artistic effect and functional effect.

1. tree selection. Trees are mainly used as street trees in street greening, and their functions are mainly to shade pedestrians and beautify street scenes in summer. Therefore, when selecting varieties, we mainly start from the following aspects:

(1) The plants have neat shapes and high ornamental value (or flowers, leaves and fruits are strange, or colorful, or have a long flowering period). It is best that the leaves change color in autumn, and branches can be seen like trees in winter.

(2) strong vitality, few pests and diseases, easy management, low management cost, and no peculiar smell of flowers, fruits and branches;

(3) Trees germinate early and shed leaves late, which is suitable for normal growth in this area. When leaves fall in late autumn, the leaves can fall off in a short time, which is convenient for centralized cleaning; (4) Street trees have neat crowns, high enough branch points, stretched main branches, and an included angle of not less than 30 degrees with the ground, with close leaves and shade; (5) It is easy to propagate, survive and recover after transplantation, and is suitable for transplanting big trees; (6) It has certain anti-pollution and anti-smoke ability; (7) The life span of trees is very long, and the growth rate will not be too slow. At present, cedar, juniper, juniper, balsam tree, Sophora japonica, Albizia Albizia, Luan tree, weeping willow, steamed bread willow, Eucommia ulmoides and Fraxinus mandshurica are widely used in Tang City, Hebei Province.

2. Selection of shrubs. Shrubs are mostly used in parking lots or sidewalk green belts (green belts between the edge of the roadway and the building red line), which can block the line of sight and reduce noise. Pay attention to the following aspects when choosing:

(1) Full branches and leaves, perfect plant type, long flowering period, and more flowers exposed to prevent excessive sprouting from blocking traffic;

(2) The plant has no thorns or fewer thorns, the leaf color changes, and it is resistant to pruning. In a certain period of time, the shape and height of the tree can be controlled by manual pruning;

(3) Easy to raise, easy to manage and resistant to dust and road radiation. Buxus macrophylla, Ligustrum lucidum, purple leaf tiller, rose, purple cover flower, clove, bauhinia, forsythia and plum blossom are widely used in Tangshan City.

3. Selection of ground cover plants. At present, most cities in the north mainly choose cool-season turf as ground cover plants, so it is very important to choose suitable turf grass species according to climate, temperature, humidity and soil conditions. In addition, various low flowering shrubs can also be used as ground cover plants, such as Tang Di.

4. Selection of herbaceous flowers. Generally, perennial flowers are the main flowers in the open field, skillfully matched with arbor, shrub and grass, and rationally arranged: annual and biennial herbal flowers are only decorated in key parts, so it is not suitable for multi-use.

Second, the road plant configuration

There are two main types: neat street trees; The layout of natural garden road.

1. Ordinary garden street trees. In this type, the factory configuration forms are:

(1) Trees are dominant, with lawns: tall trees not only have good shading effect, but also make people feel magnificent, but they are monotonous.

(2) Trees and shrubs: it can not only increase the changes of landscape and seasons, but also have a sense of rhythm and rhythm;

(3) Evergreen trees with flowers, shrubs, lawns and hedges (or color blocks): this form can be evergreen all year round and has seasonal changes, which is a widely used form at present; In addition, if conditions permit, it can be arranged in multiple rows, which can not only increase the green area, improve the green level, but also greatly reduce the noise, which is also the direction and trend of future development.

2. The layout of natural garden roads. Setting natural garden roads on both sides of busy roads, that is, tree-lined roads (with a certain width, parallel to the street, similar in function to street green space, and sometimes can play the role of small gardens), especially on the side where residents are relatively densely populated, can not only facilitate residents to freely enter and leave the forest belt for a walk and rest (without crossing the busy street), but also effectively prevent and reduce the harm of vehicle exhaust and noise to residents. This form is more common in various cities.

Garden greening plant selection table

1 Common greening trees (1) Evergreen conifers

1. Trees: Cedar, Korean pine, Pinus massoniana, Sabina vulgaris, Aralia elata, Taxodium ascendens, Taxodium ascendens.

Species classification indication

2. Shrub, cypress, creeping 3. Cypress, cypress,

(3) Evergreen broad-leaved trees:

1. Trees: Cinnamomum camphora, Cinnamomum camphora, Cinnamomum camphora, Cinnamomum camphora, Cinnamomum camphora

2. Shrubs:,,, 3. , orange tree,

,,,,, Golden Coral, Nandina domestica, Xuezhong, Ligustrum lucidum, Illicium verum, Gardenia, Mosquito Mother, Camellia, Hypericum, Rhododendron, Yucca (Boluohua, Arrowhead), Cycad (Cycad) and Ten Contributions.

(4) Deciduous broad-leaved trees:

1. Trees: weeping willow, straight willow, Pterocarya stenoptera, dragon claw willow, tallow, locust tree, paulownia (China Wu

Tung), Platanus acerifolia, Sophora japonica, Sophora japonica, Albizia Albizia, Ginkgo biloba, Melia azedarach and Catalpa bungeana.

2. Shrubs: cherry blossom, magnolia, peach blossom, wintersweet, crape myrtle, bauhinia, Shu Qi, breeze,

Red-leaf plum, sessile begonia, bell-shaped begonia, hydrangea, Solidago (golden stripe), Hibiscus, Hibiscus (Hibiscus), Hemerocallis (Guiyuan tree), Pomegranate.

(5) Bamboo: Cixiao bamboo, Phyllostachys pubescens, Phyllostachys pubescens, Guanyin tree, Cizhu, Phyllostachys pubescens, and Jasper bamboo inlaid with gold.

(6) Vines: wisteria, Roche, Parthenocissus tricuspidata (Parthenocissus tricuspidata, Parthenocissus tricuspidata), ivy, grapevine, (7) Euonymus fortunei.

(8) Flowers: sunflower, chrysanthemum, bunch of red flowers, canna, five-color amaranth, Chinese cabbage (cabbage),

Chrysanthemum and orchid 9) Lawn: Velvet grass, Zoysia japonica, Ophiopogon japonicus, Four Seasons grass, Tall fescue, Manila grass, (10) clover, (1 1) water chestnut.

9) Lawn: Velvet grass, Zoysia japonica, Ophiopogon japonicus, Sijiqing grass, Tall fescue, Manila (10) clover, (1 1) water chestnut.