There is a difference between the backbone tree species and the keynote tree species

There are some differences between the backbone tree species and the keynote tree species in the street tree in terms of quantitative proportion, ecological role, economic value, distribution range, regeneration and resilience capacity and management focus

1.Quantitative proportion: The keystone tree species are usually the most abundant and dominant tree species in the forest, which determines the overall characteristics of the forest. In contrast, the number of backbone tree species is smaller, but it supports and cooperates with the forest structure.

2.Ecological role: Due to the large number of keystone tree species, they play a leading role in forest ecology, such as regulating environmental humidity and providing food. Although there are few backbone tree species, they have important ecological functions, such as nitrogen fixation and nutrient supplementation.

3.Economic value: Due to the abundant resources, the economic utilization value of keystone tree species is usually high, such as timber acquisition. In contrast, the economic value of backbone tree species is small but not negligible.

4.Distribution: The distribution range of keystone tree species is relatively wide, and can be widely distributed in different forest types. In contrast, the distribution of backbone tree species is more limited, usually concentrated in some forest types.

5.Regeneration and restoration: The regeneration and recovery ability of keykey tree species is usually strong, and they can naturally regenerate to form large areas of simple forests. In contrast, the backbone tree species have poor regeneration and recovery ability, and it is difficult to form natural forests alone.

6.Management focus: Forest management focuses more on key tree species, and regulates their quantitative proportion and growth quality. This is mainly due to the dominance of keynote tree species in the forest, which plays a leading role in forest ecology and economy.

In general, the keynote tree species have significant ecological and economic value in the forest, while the backbone tree species play an important role in maintaining the structure and function of the forest ecosystem. In the planting of street trees, the combination of these two tree species can be considered at the same time to achieve both ecological and economic benefits.

That's a good question!

The keystone tree species is the most widely used and tried and tested native tree species.

Backbone tree species are tree species that play a backbone role and are used as key propagation and application.

These two concepts are mostly used in urban tree species planning (or part of urban green space system planning), and I personally believe that these two concepts have little guiding significance for specific landscape design such as roads.

In the specific landscape design, it is better to put.

The keynote tree species is replaced with a background tree.

The backbone tree species are replaced with medium and foreground trees.

But different fields are understood differently, so don't get confused.

1. Common species 1, weeping willow: this plant likes light and is shade-tolerant, prefers a warm and humid environment and acidic soil, the root system of the plant is quite developed, and the growth rate is very fast, but the not very good point is that the life span is relatively short.

2. Ginkgo biloba: This plant likes light and is resistant to severe cold, suitable for living in fertile and well-drained soil, although the roots are developed and the roots are relatively deep, but it can not withstand waterlogging, and can not withstand excessive water soaking.

3. Populus tomentosa: This plant also likes light, and the requirements for the soil are not very strict, acidic and alkaline, but severe drought or poor soil will have a certain impact on its normal growth, and its fast growth rate and long life are its major advantages.

4. White birch: This kind of plant is different from other varieties, can not withstand the shade, the demand for sunlight is great, but the speed of growth and development is average, and the life span is relatively short, the advantage is that the ability to adapt to the environment is relatively strong.

5. Eucommia ulmoides: This kind of plant adaptability is also relatively strong, and can grow in acidic, neutral and even slight saline-alkali land, in addition to the drainage performance.

2. Role 1: It can beautify the environment and add a touch of color to the monotonous urban life.

2. It can play a role in purifying the air, supplementing oxygen and reducing noise.

Our kind of camphor is also mosquito-proof.

Street trees generally require the trunk to be meters tall.

On the same road, the tree shape and the height of the fixed trunk should be basically the same, and the difference in the height of the fixed trunk should not exceed meters. The canopy clearance height on bicycle lanes and sidewalks shall not be less than meters, and the canopy clearance height of simple stoves on roadways shall not be less than meters. <>

On the same arterial road, it should be relatively consistent, and in the area where the road surface is narrow or there are large vehicles passing through, it is advisable to take more than 3 to meters. On wide roads or pedestrian commercial streets, it can be reduced to meters, and tree species with small branch angles can be appropriately lower, but not less than 2 meters.

The size of the tree should be as neat and uniform as possible, so as to avoid affecting the aesthetic effect and bringing inconvenience to management due to the unequal height and size, size and thickness.

Requirements and cultivation of street trees

The street tree is characterized by neat tree shape, lush branches and leaves, large crown and thick shade, it can reflect the order and unity of the city, the height of the trunk should be determined according to its functional requirements, traffic conditions, road nature, width and other factors, there is no unified requirement.

Generally, seedlings need to be cultivated for more than 5 years to reach a certain standard. First of all, the street tree requires height, aesthetics, trunk height and canopy width to be buried, and timely shaping and pruning can grow into a street tree that meets the requirements. Road greening is an important part of urban beautification, in recent years in urban greening, the application of street trees is more and more diversified.

It's too much... The street trees in the north and south are different, such as: in the south, there are ficus microphylla, Tianzhu gui, ginkgo, magnolia, Du Ying, etc., in the north, there are cedars, poplars, masson pines, plane trees, etc., the main role is to beautify the road, reduce dust, and shade in summer

Street Tree Comparison 1: The living environment of street trees is compared with that of the same kind.

Companions: Living in "primeval forests that see no light of day"; In the dew, playing with the cool clouds.

Street Tree: "Fallen" on the side of the road on the two-lane road; The only decoration is "a body of smoke and dust that does not fall".

Comparison 2: The living conditions and attitudes of street trees are compared with those of humans.

Human beings: Busy and urgent, bright and green; I have long been accustomed to filth.

Street Tree: In the silence, in the darkness, in the loneliness of not being understood; Stubbornly make the freshness that is not cherished, welcome the sun, and usher in the light.

Comparison 3: Compare the word order and the feelings expressed at the beginning and end of the article.

Beginning: We are a row of trees, standing in the dust of the city.

Ending: Standing in the dust of the city, we are a column of sad and happy trees.

Arbor in road greening, mainly as a street tree, the role is to shade and beautify the streetscape, so the selection of varieties mainly from seven aspects: The tree shape is neat, the ornamental value is higher (or flower type, leaf type, fruit peculiar, or bright flower color, or long flowering period), the best leaves change color in autumn, and the tree shape and branches can be seen in winter. Strong vitality, few pests and diseases, no bad smell of flowers, fruits, branches and leaves.

The trees germinate early and fall their leaves late, which is suitable for the normal growth of the region, and the leaves can fall in a short time during the late autumn defoliation period, which is convenient for centralized cleaning. The crown is neat, the branch points are high, the main branch extension angle is not less than 30 degrees from the ground, the leaves are tight, and there is thick shade. It is easy to propagate, easy to survive and restore growth after transplantation, and is suitable for transplantation of large trees.

It has a certain ability to resist pollution and smoke and dust. Trees have a long lifespan and a faster growth rate. At present, the tree species that are more widely used in road greening in Yulin City include Acacia japonica, Acacia longclaw, Populus tomentosa, weeping willow and so on.