Urban landscaping is to introduce natural factors into the city with rich garden plants. As the main body of urban landscaping, garden trees can form a complete greening system and beautiful landscape, purify the air, maintain soil and water, adjust the climate, prevent pollution, improve and beautify the urban environment, maintain urban ecological balance, provide places for people to visit, rest and exercise, and promote physical and mental health. Landscape greening is urban construction? A beautician? , is also an important part of urban construction, is conducive to the contemporary and future generations of urban infrastructure, plays a decisive role in the construction of modern cities, and has a positive role in promoting the development of the whole city and even social economy. ?

First of all, plastic pruning should be unified with the ecological environment conditions. ?

By pruning, the proportional relationship between plant organs can be adjusted to make it tend to be balanced. Adjust the relationship between leaf nutrients, so as to maintain certain growth and thicken the growing soil.

Second, plastic pruning should conform to the branching law of ornamental flowers and trees. ?

1, the main branches of flowers and trees should be restrained and weakened to form a tall and straight crown. Such as: Xifu Begonia

2. Should axial branching be adopted, such as cherry blossom and Lagerstroemia indica? Get rid of the top advantage? The method is to cut the annual top branches short. Strong buds should be left under the incision, and 3 ~ 4 lateral buds should be removed to ensure good growth of strong buds. This pruning method is mainly to enlarge the crown, increase the number of flower branches and promote the flowering inside and outside the plant. However, in the young tree stage, the central branch should be cultivated, and the lateral branches should be selected and arranged reasonably to make the main branches obvious.

3. Pseudodichotomous flowers and trees can not form terminal buds at the end of apical growth, and the lateral buds are opposite. At this time, we should remove one, keep strong buds and cultivate tall trunks. Such as: lilacs?

4, many flowers and trees such as oleander, Daphne odora, etc. Because the terminal bud is not full, plastic pruning should be adopted? Re-cultivating the main branches of the center by holding buds. The number of flower buds of this kind of flowers and trees is related to its incident angle. If the angle is moderate, there will be more flowers and more fruits. ?

Third, follow the principle of top advantage, control the tree shape and promote flowering. ?

Different tree species have different apical advantages.

Four, plastic pruning should consider the use of light energy.

Cut off the top of the branch, make the lateral buds sprout, form more short and medium branches, increase the leaf area and improve the utilization rate of light energy.

Fifth, plastic pruning should conform to the law of nutrient distribution and accumulation in trees.

In the flower bud differentiation stage, the nutrition center will be transferred to the short branches to ensure the number of flowers and fruits. The vigorous branches should be cut short and pitted to promote the concentration of nutrients on the short and medium branches. In addition, we should focus on cutting off overlapping branches, staggered branches and over-dense branches, so that the leaves inside and outside the crown can see light and increase photosynthetic products.

Six, must follow the growth and development of trees. ?

Through shaping and pruning, the relationship between plant growth and development can be adjusted, so that nutrients can be supplied to the needed parts. Because of the different uses of flowers and trees, the purpose and method of shaping and pruning are also different.

1. Street trees: The purpose of childhood is to grow fast, the trunk is tall, and promote vigorous development. Ensure the growth of main branches after molding, and re-cutting can promote the growth.

2, flowers and trees: to prevent premature aging of young trees, we should pay attention to summer pruning, mainly light pruning. After molding, it is necessary to ensure flowering while expanding the crown, and to cultivate backbone branches at all levels to maintain the balance of the tree. It is necessary to strictly control long branches, competing branches and disturbing branches. After adulthood, we should cultivate permanent branches and leave enough backup branches, so that adult branches and backup branches bloom alternately and increase ornamental value. For old trees, on the basis of promoting root growth, trunk cutting and regeneration should be carried out. Pruning and coring can inhibit the elongation of branches, promote the transport of nutrients to short and medium branches, and achieve the purpose of more flowers. ?

In order to meet the ideal requirements of medicinal seed trees, aesthetic principles should be followed in the process of shaping and pruning, among which the principles of proportion and scale are more important. ?