What Is a Specification Tree?

Seedling specifications refer to standards for the age, height, ground diameter, and root development status of suitable seedlings for afforestation. Specific standards can refer to the yield and quality standards of main afforestation tree species and seedlings in various places.

Seedling specifications

Right!

Seedling specifications refer to standards for the age, height, ground diameter, and root development status of suitable seedlings for afforestation. Specific standards can refer to the yield and quality standards of main afforestation tree species and seedlings in various places.

Chinese name

Seedling specifications

Foreign name

Seedling size

Attributes

Tree concept

In urban landscaping,

1. Relationship between seedling size and survival rate

Ensuring plant survival is a prerequisite for stable green resources. The age of seedlings has a great impact on the survival rate of planting. At the same time, the adaptability to the new environment and the resistance to stress will have some differences due to the different seedling specifications. Therefore, irrational seedling specifications will inevitably lead to a reduction in the survival rate of seedlings. At the same time, it will also increase the efforts to maintain and manage funds in the later stages of seedlings.

Growth characteristics of plants at different seedling ages

Because of the small range of their root systems, seedling trees tend to have more fibrous roots when they emerge. It has a low damage rate to the root system, strong recovery of shoots on the ground, and strong growth. At the same time, the young tree has great plasticity and strong adaptability to the new environment, so the survival rate of young plants is high. However, planting too small seedlings in cities affects the greening effect on the one hand and is easily affected by human activities on the other. For mature trees, that is, large trees, although their root systems are widely distributed, the absorbing roots are far away from the trunk, and the roots are easily injured when they rise, so the survival rate of transplanting is relatively low. In order to improve the survival rate, the technical requirements for various aspects of planting and maintenance are high, and the cost of construction and maintenance is increased. At the same time, the characteristics of the old tree species have been determined, the plasticity is low, and the ability to adapt to the environment is far less than the young tree. For a large number of urban greening seedlings, it is best to choose seedlings at the young and young stages. The seedlings at this stage not only have a certain ability to adapt, but also have the ability to grow quickly. The planting is easy to survive, and the greening effect is faster.

The disadvantages of big tree transplantation

Because of the big tree's own life cycle laws, big tree transplantation technology is very demanding and complicated, and it requires high cost investment. Therefore, the big tree transplantation should be based on the nature of its location and the needs of the construction of key urban landscapes, rather than the normal state of urban greening as I see it. It is not difficult to find from the actual status of greening that a large number of large trees die in the buried year of transplantation. Therefore, we must respect the objective laws, treat the ecological city construction scientifically and rationally, and avoid the reduction of the survival rate and the unreasonable allocation of green funds caused by unnecessary and blind tree transplanting.

The National Greening Commission and the State Forestry Administration issued the "Notice on Prohibiting the Transfer of Big Trees and Ancient Trees into the City" issued to all places in the same place: "In recent years, in order to pursue rapid greening in cities, a large number of large trees have been transplanted to occupy trees. The city not only causes damage to the native forest resources and natural ecology and landscape of the trees, but also has a low survival rate due to the intensive pruning and cutting of the crown during the transplantation process and the inability to keep up with it. This has caused the protection of forest resources and the development of urban and rural greening. Extremely adverse impact. "At the same time, it is recommended to actively guide urban greening to adopt suitable large seedlings and replace large tree transplants with large seedlings.

Selection of seedling specifications

The so-called large seedlings refer to seedlings that meet the requirements of urban greening after transplanting, pruning and years of cultivation. Because the urban greening uses large seedlings with strong growth, good crown shape and developed root system, it can quickly achieve the expected effect, and play a role in beautifying the environment and improving the environment. Therefore, it is recommended that the specifications of seedlings be selected for general urban greening projects: deciduous trees with a DBH of 5 to 10 cm, evergreen arbor trees with a height of 2 to 3.5 m, deciduous shrub trees with a height of 1 to 1.5 m, and a ground diameter of 2 to 4 cm. The diameter should not be less than 30cm.

2. Relationship between seedling specifications and planting forms

Through long-term practical observations, we have clearly realized that in actual greening projects, when the same seedlings are often seen in clusters or groups, their specifications are too close to cause defects in the plant landscape. Because the selected seedlings are too small, they want to take effect immediately, which leads to the crowded planting of seedlings, which directly affects the effective use of nutrients for nutrients, moisture and sunny air. A large number of large trees were transplanted on both sides of a road, and the original tree shape was damaged due to the need for intensity pruning, and even a large number of deaths occurred in a short time.

Due to the variety of tree planting forms and the various ways of matching each other's plants, in order to better highlight the plant landscape effect, if other factors are satisfied, the selection of seedling specifications should be emphasized and the area should be highlighted. For example, the solitary tree used in key areas and key plant landscape effects, the opposite tree species in front of the main building, the arbor layer in the group planting grove, etc., can be larger in specifications; the effect of sheet planting, forest planting, and general green areas Wait, the size of the selected alder should be smaller; the size of the seedlings of the same tree species in the secondary and group planting species must be changed; for the tree species that are planted, the specifications of alfalfa must be similar, and the size must be moderate . A good planting method is the basis for creating a green plant landscape, and the stable plant landscape effect is closely related to the choice of plants and plant growth conditions. Therefore, the selection of seedling specifications should be scientific, reasonable, and practical to avoid unrealistic, Great joy.

3 Relationship between seedling specifications and greening investment

Each time the seedling specifications are increased, the price will increase by one, several, or ten times. Therefore, the different specifications of a greening project due to the selection of the same seedlings or the same seedlings will bring great differences in the direct costs of seedlings. At the same time, due to the large number of transplanted large trees, other costs, such as the increase in transportation costs, planting costs, and maintenance costs, in addition to the direct costs of seedlings, will be caused. Therefore, in the case of a certain greening cost, to use the limited funds reasonably, first of all, managers, designers, engineering and technical personnel must change their mindsets and set their sights. It is clear that building an ecological city is not a thing that will happen overnight. Respect for objective laws Recognize that only through the accumulation of time can the city's greening situation be fundamentally changed in the near future.