Pruning method of greening tree and material tree
Tree pruning is one of the management measures for afforestation. By pruning artificial technical measures such as "helping, reducing and slowing down", ventilation and light transmission are controlled to create suitable conditions for the growth and development of trees and create high-quality materials with straight shape and beautiful crown shape. Pruning should adopt different methods according to different forest species and tree species, afforestation density and afforestation purpose. When conifers are planted, they can prune the residual branches, dead branches and multi-headed branches, and only keep one upright branch. Prune dense branches 5- 15 years after afforestation, and prune side branches 1-2 rounds every 4-5 years. When poplar is used to build shelter forest and timber forest, the central branch on the trunk should be selected as the leading branch in time, and its competitive branches should be pulled out in time, side buds should be picked, and redundant side branches should be pruned to promote the growth of trees. The greening around urban and rural areas and the pruning of trees in urban greening communities should pay attention to the beautiful and generous tree shape, which is unique and suitable for viewing. For the willow with the top cut off, it should be cultivated into a "four-sided bucket" or a "three-legged" shape to avoid a "fork" shape with two branches and one fork. Trimming incision should be smooth to prevent wall crack. The suitable stubble height is 1 cm-2 cm. Too high or too low will affect wound healing and tree growth. Pruning season is suitable for early spring or late autumn and early winter. In early spring, it should be done before the sap flows out. If the trees are pruned when they sprout, the water in the trees will evaporate quickly, lose water and consume more nutrients, which is not conducive to the growth of trees. Some fast-growing tree species, such as poplar and willow, can also be pruned in summer. But be careful not to prune in rainy days, so as not to soak the wound and infect the disease. Pruning should pay attention to "cutting in winter and controlling the edge in summer", that is to say, in winter, strong trees should be cut again, and weak trees should be cut lightly. The key point is to prune upright and competitive branches from the base. In summer, the principles of re-controlling strong branches, controlling strong branches and keeping weak branches, adjusting and balancing tree potential, re-cutting strong lateral branches, lightly cutting weak branches and keeping more branchlets are adopted to achieve the pruning purpose of highlighting the trunk and promoting the growth of trees.