How do you pick out the bad tree species? What are the disadvantages of having too many street tree

It is quite difficult to identify tree species from the trunk or branches alone, because the key to identification is not based on flowers, fruits, and leaves. It's like recognizing a person, when you don't see his face and only see his figure or back, do you say he is Zhang San or Li Si? However, it is not completely impossible to identify a tree species from its trunk or branches alone.

Generally speaking, it is mainly to observe the trunk: 1. Whether the outer skin is cracked, the depth of the crack and its direction, the form of peeling, etc.; 2. The color, inclusions, cross-sectional pattern of the endothelium, etc.; 3. Thickness of bark, texture, smell, taste, etc. For example, the bark of Quercus japocarpus is particularly thick, brittle, and the appearance is deeply longitudinally cracked, the bark of persimmon tree is square-like cracked, the upper part of the bark of Masson pine is cracked in scales, the lower part is deeply longitudinally cracked, the bark of cherry wood is transversely cracked, the outer bark of plane tree is irregularly shed, and the outer bark of Coptis chinensis is scaly and rolled. The outer bark cork layer of cork oak, Yunnan fir and ginkgo biloba is particularly developed and flexible, and there are thorns on the bark of Thorn tree, Kapok and Catalpa, and the bark of Poplar has diamond-shaped skin holes.

From the bark section, the bark of the thick-barked fragrant tree is red, the bark of the bauhinia and the cork is yellow, the bark of the lotus tree contains needle-like crystals, the bark of the eucommia tree contains a large amount of gum, and the bark of the oak tree contains black stone cells. For example, the sap of mulberry, banyan and constructival trees is milky white, the sap of Coptis chinensis, Coptis chinensis, Cinnamomum chinensis, Salina wood and lacquer is yellow, and the sap of autumn maple is red. The bark of some trees also has a special smell, such as camphor bark has a camphor smell, yellow barbarum bark has a iodine wine smell, birch and lampstand tree bark has a cool oil smell, and the bark of shell trees has a sour smell.

These characteristics of the bark are useful for identifying tree species based on the trunk alone. However, it is important to note that some characteristics of the bark can vary depending on the growing conditions, age, and trunk position.

In addition, it is possible to observe the cross-sectional shape of the branches (near the tips of the branches). For example, oleander is triangular, ash, teak quadrangular, green oka pentagonal, rhododendron octagonal, and so on.

Bad seeds are lighter, soak them in water, and the light ones will come to the surface.

The tree species are very light and can be beaten out with a windmill, and some have no billet buds and need to be picked up.

This is easy to do, you pick the sapling, the good and the bad are clearly distinguished, and it will not be troublesome when loading

If there is a bad one in the tree, you can pick it out by checking it to see which one is broken, and if there is a bad one, it is better to look good.

The wood square of the ceiling is generally * there are more pine squares. The general specifications are 4 meters long, there are 2*3cm, 3*4cm, 4*4cm, etc. The appearance is visible on all sides without skin, and these methods can also be used when there is no instrument.

1) Hand Method. Gently weigh multiple pieces of wood, the wood with a small water content will be lighter, and the wood with a high water content will be significantly heavier. (2) Hand touching.

Place your palm flat on the surface of the wood and feel how wet it is. (3) Nail hammering method. Gently hammer in the wood with long nails, which tends to be easy to nail in well-dried wood, and difficult to nail in wood with high humidity.

Friends have used a project called Zhongnan Shenjian, you can go and find out.

Planters are short-sighted, focusing only on short-term economic benefits and ignoring the long-term impact of eucalyptus on the wild environment of raw residue. In other words, regardless of the environmental impact of the opening and closing, eucalyptus can grow rapidly, bringing benefits to growers, which other tree species cannot do.

Don't worry too much, that tree is on the side of the road or **, besides! It's inside your own earth

The damage is certain, but it is not known to what extent.

Analyze it on a case-by-case basis based on your specific situation.

But what is certain is that if you are not at ease, you can transplant it.

1.Pests and diseases are one of the factors.

2.In addition, each tree species can only absorb a specific number of harmful gases, if it is too single, it is not conducive to effective air purification.

3.It is not conducive to the development of biodiversity, for example, different trees attract different birds and insects, and if there is a single tree species, many organisms will not be able to find habitat in cities.

4.Street trees should also be designed according to the characteristics of the road. For example, the plane tree is generally planted on relatively narrow roads, because it has the advantage of providing dense shade in summer, and it will be very incongruous if planted on eight lanes.

5.Again, this is also taken into account in urban landscape planning. Tree species that are too monotonous will make the city dull and boring, make people lose their freshness, and thus lose the charm of the city.

However, generally only one tree species is used on a road, and too many species will appear chaotic and difficult to manage.

If a large area of green space in a city is monopolized by a few tree species, it will not only cause monotonous landscapes and unstable urban ecosystems, but also make it easier for pests and diseases to spread.

Street trees should be rich and diverse, not all sycamores, nor all camphor.

Yes, you can stay away from the wall.

Crape myrtle aliases: itchy flower, itchy tree, purple goldenrod, purple orchid, mosquito flower, bayberry, zinnia, barkless tree, Latin name: lagerstroemia indica L

Celandaceae and crape myrtle are deciduous shrubs or small trees that can reach up to 7 meters in height; The bark is smooth, gray or grayish-brown; Branches mostly twisted, branchlets slender, leaves alternate or sometimes opposite, papery, elliptic, broadly oblong, obovate, green to yellow when young, purplish-black when mature or dry, dorsal dehiscence; The seeds are winged and about 8 mm long. The flowering period is from June to September, and the fruiting period is from September to December.

Conservation management. The cultivation and management of crape myrtle is extensive, but it is necessary to cut off dead branches, diseased and insect branches in time and burn them. In order to prolong the flowering period, the branches that have already bloomed should be cut off at the right time to allow them to sprout again and grow the next round of flower branches. In order to thicken the trunk, you can cut off a large number of flower branches and concentrate on nutrient cultivation of the trunk.

Practice has proved that with proper management, crape myrtle can be pruned many times a year to make it bloom many times, up to 100 120 days.

Enhance light: Crape myrtle likes sunlight and must be placed in outdoor sunlight during the growing season.

Timely watering: spring and winter should keep the potting soil moist, summer and autumn should be watered once a day in the morning and evening, drought and high temperature can be appropriately increased every day, with river water, well water, rainwater and storage for 2 to 3 days of tap water.

Regular fertilization: too much fertilization of potted crape myrtle can easily cause branches and leaves to grow, if the lack of fertilizer will lead to weak branches, yellow leaf color, and the growth of the whole plant will become weaker, with less or no flowering. Therefore, it is necessary to fertilize regularly, more fertilizer in the spring and summer growing season, less fertilizer in autumn, and no application in the dormant period in winter.

Do not fertilize at noon on rainy days and high temperatures in summer, and apply fertilizer concentrations to"Thin fertilizer is applied frequently"The principle is to apply Trim fertilizer every 10 days from the beginning of spring to the beginning of autumn, and apply it every half month after the beginning of autumn, and stop fertilizing after the beginning of winter.

Reasonable pruning: crape myrtle is resistant to pruning, has strong branching force, and has a large amount of new shoots. Therefore, after flowering, the residual flowers should be cut off, which can prolong the flowering period, and cut off the long branches, overlapping branches, cross branches, radiant branches and diseased branches at any time to avoid consuming nutrients.

Timely repotting: potted crape myrtle every 2 to 3 years to change the potting soil, with 5 parts of loose mountain soil, 3 parts of pastoral soil, 2 parts of fine river sand mixed to make culture soil, when changing the pot, you can use bone meal, soybean cake powder and other organic fertilizers as base fertilizer, but can not make the fertilizer directly contact with the root system, so as not to hurt the root system, affect the growth of plants.

Is it okay to have junior high school by the wall? Well, a distance of about one meter. Roots will break the gun.

Lucuma, a coffee tree planted on the roof of the building, its root system will more or less damage the roof, you can use a large pot to plant it.

Of course, it will damage the roof, because if it is planted directly on the roof, the moisture in the soil will make the roof damp, and the root system of the fruit tree will take root on the roof, and over time, it will damage the roof'It is serious, which causes safety hazards.