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Technical specification for protection of ancient and famous trees

Protect bark

. It is forbidden to nail the trees, wind wires, ropes, hang sundries or use them as supporting points and fixtures for construction. It is forbidden to carve bark and climb branches. If scars and tree holes are found, they should be repaired in time. The rotten part should be treated by surgery.

2. Fence. The first-class ancient and famous trees and the second-and third-class ancient and famous trees that grow in the park green space or have high personnel density and are vulnerable to damage shall be protected by fences. The distance between the fence and the trunk is not less than 1.5m. If the special site conditions cannot reach1.5m, the minimum requirement is that people cannot touch the trunk. Some ground cover plants are planted in fences to keep the soil moist and breathable.

3. Investigate the growth of ancient and famous trees every year and make records. If abnormal growth is found, it is necessary to analyze the reasons, take timely maintenance measures, and collect specimens for archiving.

4. According to the different requirements of different tree species for water or drainage. In the hot and dry season, according to the determination of soil water content, it is confirmed that the root system is short of water when watering or foliar spraying. Good natural drainage system is needed within the distribution range of roots, and long-term water accumulation is not allowed. Blind ditches and underground wells are needed for those that cannot be ditched. Old trees growing on the hillside can build pools below to expand the scope of water absorption and growth.

5. If the old trees grow in the same place, the soil fertility will decrease, and fertilization will be carried out under the condition of determining the content of trace elements. If the soil is short of trace elements, more trace elements can be applied, and the fertilization methods can be hole application, radioactive furrow irrigation and foliar spraying.

6, pruning dead branches and twigs of ancient and famous trees, should be put forward by the competent technical personnel in advance, reported to the competent department for approval before implementation. Pruning should avoid the bleeding peak. Small dead branches are sawed off with a hand saw or hooked off with an iron hook. Cutting technology should keep the kerf smooth without splitting and peeling, and large and thick branches should be cut in sections. Pay attention to safety when operating, and apply preservatives to the kerf to prevent water evaporation and pests and diseases.

7. Old and famous trees are unstable or the thick branches are decayed and seriously drooping, which needs support and reinforcement. Support should be beautiful, and rigid support and elastic support can be used.

8. Regularly check the pests and diseases of ancient and famous trees, take comprehensive prevention and control measures, seriously promote and adopt safe, efficient and low-toxic pesticides and new prevention and control technologies, and prohibit the use of highly toxic pesticides. Chemical pesticides should be operated in accordance with relevant safety operation procedures.

9, tall trees, around 30 meters without tall buildings should be set lightning protection device.

For ancient and famous trees, maintenance records should be filed year by year. Ancient and famous trees grow in unfavorable special environment and need special maintenance. When carrying out special treatment, the management department shall write a report and implement it after approval by the competent department. The whole construction process needs the on-site guidance of engineers and technicians, and photography or photographic data should be archived.

1, the soil is dense, the water permeability is poor, and the soil water content is high, which affects the normal life activities of roots, so the soil can be changed by combining fertilization. If the water content is too high, blind ditches and underground wells can be excavated for drainage.

2. Ancient and famous trees and road squares with high pedestrian density can be paved with good air permeability within the root distribution range (generally 2m outside the vertical projection of the crown). The material of ventilation pavement should have good water permeability and air permeability, and different compressive materials should be used according to the compressive needs of the ground. Breathable paving can adopt inverted trapezoidal brick paving and overhead paving.

3. The change of soil quality causes the change of soil water content. If the underground water accumulation is caused by the leakage of underground engineering, it is necessary to find the leakage point and stop the leakage. If the water holding capacity is insufficient because the soil contains construction dregs, it should be mixed with soil replacement, dregs removal and appropriate loam.