The so-called green conservation refers to the management and conservation of trees, green spaces, vegetation and other plants, which is still a new industry and is recognized by the society because of its particularity. Among them, the maintenance of green trees is a very important part. Trees that grow normally have certain maintenance standards according to different regions and different tree species. In fact, there are certain principles for dealing with problematic greening trees. Today, we only talk about replanting trees in landscaping maintenance management.
1, replanting season
Deciduous trees: replanting before germination after soil thawing in spring or replanting after defoliation before soil thawing in autumn.
Conifers and evergreen broad-leaved trees: replant before germination after soil thawing in spring, or replant before first frost after new buds stop growing in autumn.
2, recorded before the death of trees, and replant as soon as possible.
3 replanted trees should use the original tree species with similar specifications. Changes in tree species or specifications must be coordinated with the original landscape, and the replanting of street trees must be consistent with the tree species in the same section. Original link: /a/news/29660.html? 1300262872 replanting of green seedlings: an effective method to improve the survival rate of replanted seedlings in spring. Early spring is the best time to replant garden seedlings. Although the investment in replanting green seedlings in various cities is large, the survival rate is often unsatisfactory, resulting in replanting every year and shortage every year. Grasping the important links such as seedling selection, seedling digging and planting can effectively improve the survival rate of seedlings.
The quality of seedlings is very important, so we should pay attention to the selection of seedlings with thick branches, full buds, no pests and diseases and beautiful shapes. In addition, because it is used for replanting, the size of seedlings should be coordinated with the surrounding seedling size, and replanted trees, especially street trees, should try their best to achieve consistent height of branches and plump trees. Water the trees once a week before digging to replenish water, so as to avoid premature dehydration after emergence. Generally, you should bring soil balls when digging seedlings. Generally, the diameter of soil ball should be calculated as 8 to 10 times of DBH, and deciduous trees can also use exposed seedlings, and the root length is also 8 to 10 times of DBH. When excavating, excavate vertically downward along the specified root outer ring. In the process of excavation, when encountering thick roots, use a hand saw to cut them off, so as not to split the roots, try not to hurt the root bark and fibrous roots, and keep the original soil. Pruning Before planting trees, the crown should be pruned to different degrees to reduce the evaporation of water in trees and keep the balance between supply and demand of water in trees. The pruning amount varies according to different tree species and landscape requirements. For larger deciduous trees, especially branches with strong growth potential and easy to extract new branches, strong cutting can be carried out, and the crown can be reduced to more than half. Tall deciduous trees with obvious trunk should keep their original tree shape and be thinned appropriately. The main lateral branches should be cut short on the buds of strong seedlings, and the branches of 1/5 ~ 1/3 can be cut off. Deciduous trees with inconspicuous trunk and dense branches, if the trunk diameter is greater than 10 cm, can be thinned to maintain the original tree shape; If the diameter of the trunk is 5 cm to 10 cm, you can leave a few side branches on the trunk and keep the original tree shape for short cutting. Evergreen trees with dense branches can be moderately thinned, and the branches and leaves are concentrated in the seedlings at the top of the trunk. Without pruning the branches, only the leaves can be burned. Evergreen conifers should not be cut more, only pests, dead branches, weak branches, over-dense whorls and drooping branches should be cut. The crown of precious tree species should be raised as little as possible. Wounds caused by tree pruning should be coated with protective agents, such as paint and vaseline. Planting "three burying, two steps and one seedling raising" is a scientific tree planting method advocated by forestry science and technology department. This planting method includes three times of burying soil, two times of tamping and one time of lifting seedlings upwards. The specific planting technical points are as follows: when digging a tree pit, pile the topsoil (shallow soil) into one pile and pile the core soil (deep soil) into another pile. Surface soil and core soil should not be mixed together to prepare for future filling. After digging the tree pit, the first step is not to put the saplings first, but to put the base fertilizer on the bottom layer of the tree pit, and then crush the topsoil and evenly put it on the fertilizer, so that the roots of the saplings do not directly contact the fertilizer. The crushed topsoil provides good conditions for the roots to grow, expand and relax downward. This is the first "burial", and the fertilizer and topsoil have been buried. Then put in the saplings. After the seedlings are put in, they are buried in the soil for the second time, that is, they are put into the heart soil. When the soil is half-cultivated, the soil cultivation is suspended and the seedlings are slightly lifted. This is called "one seedling raising", and its purpose is to prevent seedlings from nesting and affecting their survival and growth. Don't bury the soil immediately after seedling. At this time, step on the buried soil. The purpose is to make the roots of seedlings closely contact with the soil, absorb water and nutrients as soon as possible, so as to take root and sprout. Conducive to the survival and growth of trees. Then bury it for the third time, that is, bury the remaining heart soil until it is flush with the ground, and then step on it for the second time. The purpose is to straighten the trunk of the seedling, make the seedling closely combined with the soil, and prevent it from being blown crooked by the wind. In addition, trees should be planted in the original direction, so that plants can better adapt to environmental conditions and improve the survival rate. For the original seedlings with incomplete soil balls, the root groups have been dehydrated to varying degrees, and the seedlings need to be dipped in root pulp (2% potassium dihydrogen phosphate, 2% sugar, 1% vitamin B 12 injection and 95% yellow mud). Trees with incomplete roots and serious damage, as well as precious trees, should be sprayed with rooting agent when planting. After planting maintenance trees, build an irrigation weir with a height of 10 cm to 15 cm around the planting hole slightly larger than the diameter. The weir should be watertight. When planting trees with DBH greater than 5 cm, supports should be set up after planting to prevent crown shaking from affecting root recovery. Triangular piles or well-shaped piles have good fixing effect and excellent decorative effect, and are used in urban green spaces with large flow of people. Trees should be watered for the first time on the day of planting, and then should be replenished in time according to local conditions, generally watering not less than three times. Replanted seedlings are in the slow seedling stage, so they should be maintained in the next two years, especially if they are not short of water, and they should be checked and supplemented regularly. Original link: /a/news/34273.html? 1300262870 with the above two materials, I believe that with what I actually need to replant, this seedling replanting scheme is easily born.