Arbor Day Blackboard Information: Selection Criteria for Street Trees

Street trees play a skeleton role in urban road greening and landscaping. Street trees are divided into two categories: evergreen and deciduous. The main criteria of street trees are neat tree shape, lush branches and leaves, large crown and thick shade; Trunk straight, flowers, fruits, leaves without peculiar smell, non-toxic and non-irritating; Easy propagation, rapid growth, high transplanting survival rate, pruning resistance, easy maintenance, strong resistance to harmful gases, less pests and diseases, and can adapt to local environmental conditions.

When choosing street trees, we must consider the local environmental characteristics and the adaptability of plants to avoid blindness. According to the characteristics of ecological environment, excellent tree species suitable for the local area should be selected as street trees. The representative street trees in cities all over the country are different, such as Sophora japonica in Beijing, coconut trees in Hainan and cedar trees in Nanjing.

there are great differences in climate between north and south China. In the south, the temperature is high, the humidity is high, the rainfall is abundant, plants grow all the year round, and there are many kinds of street trees. The suitable street trees are Cinnamomum camphora, Ficus, Magnolia grandiflora, Cedar, Osmanthus fragrans, Ginkgo biloba, Liriodendron chinense, Aesculus chinensis, Maple and Metasequoia. However, the northern region is dry and the climate is dry. The street trees suitable for planting are Platanus acerifolia, Sophora japonica, Ginkgo biloba, Luan tree, willow and cedar.

On the same road, the fixed stem height of street trees must be consistent, and the spacing between plants should be determined according to the variety, with a general distance of 5 meters to 8 meters, and the DBH of seedlings is generally 8 to 1 centimeters.

in different types of roads and different locations of roads, the street trees selected are also different. For example, the type of boxwood can be selected in the middle of the two-way lane of expressway to reduce the interference of the opposite lights; In order to ensure safety and avoid blocking the line of sight at the intersection, tree species with enough branches should be selected; On the outermost side of the road, in order to prevent dust and reduce noise, different multi-layer combinations of plant shapes can be selected.