In the process of landscaping maintenance and management, trees are easier to prune than shrubs, but we should pay attention to the following problems: \x0d\ 1. The importance of tree pruning. Because trees have low requirements for pruning, many people think that trees can be cut or not, which is wrong. Not demanding doesn't mean it's not important. Garden trees should not only exert ecological benefits, but also have beautification function. Beautiful trees generally need proper pruning to form. In the process of growing year after year, trees will inevitably suffer from various injuries such as wind and rain, lightning, pests and diseases, and will inevitably produce weak branches such as dead branches, dead branches, residual branches and pests, and may fall down at the slightest sign of trouble, causing damage to people's personal and property. In addition, garden trees grow in a complex urban environment, which will inevitably conflict with surrounding trees, traffic, buildings, overhead pipelines and so on. The general way to solve these contradictions is to prune garden trees. In addition, municipal construction on the ground often damages the roots of trees, which also requires pruning the aboveground parts of trees to keep the balance between the aboveground and underground parts of trees. Therefore, tree pruning is very important. \x0d\ Second, standardize the operation. The most widely used tree pruning technique is thinning relatively large and heavy branches. Improper operation will cause bark tearing and operator injury. Therefore, the standard operation must be carried out according to the "three-saw method". The "three-sawing method" is to pull the first saw from bottom to top on the branch to be sawed about 20 cm to 25 cm away from the last saw opening until it is 1/3 of the branch diameter or start sawing; Then pull the second saw from top to bottom about 3 cm to 5 cm away from the front of the preparatory incision to cut off the branches; Finally, saw off the remaining piles on the outside of the collar. \x0d\ III。 Tree structure. The main functions of garden trees are shading and adsorbing toxic and harmful substances. Practice has proved that when the tree crown ratio reaches more than 2/3, the tree structure is the strongest, the tree grows most vigorously, and its ecological function can be fully exerted. But for street trees, it often conflicts with traffic, overhead pipelines and buildings. So the crown can be smaller, but the ratio of crown height can't be less than 1/2. So when pruning trees, the higher the pruning, the better, and the lower the pruning, the better. \x0d\ IV。 Safe pruning. Generally, trees are relatively tall. When pruning, it is often necessary to use mechanical equipment such as high-branch chain saws or climb high, and the surrounding environment is complicated, such as high-voltage wires on them and frequent activities of people around them. Therefore, when pruning, we must pay attention to eliminate all possible safety hazards and ensure that the operation is "two no injuries and one no injury", that is, no harm to ourselves, others and trees. This requires that irrelevant personnel around the trees should be evacuated before pruning, and those with high-voltage lines around them should cooperate with the power department, which should cut off the power supply and cooperate with the operation, and pruning should be carried out in strict accordance with technical requirements.