Eucalyptus has high utilization value and a wide range of uses, why is it not loved by humans later?

Due to the strong allelopathic effect, eucalyptus trees release chemicals that hinder the growth of certain plants in the forest, making it difficult for shrubs and herbaceous plants to grow.

First of all, eucalyptus trees absorb water and fertilizer excessively, and at the same time will inhibit the growth of other organisms, which will damage the ecological environment, pollute the land, and pollute the water source.

Because eucalyptus sucks up groundwater, it then depletes water resources, and it also produces toxins, and other plants where eucalyptus trees are planted have no way to survive, so eucalyptus trees are disliked

Because this kind of tree affects the ecosystem of our country, it causes other trees to have no room to grow, and it also causes the groundwater level to drop, so it is not liked by humans.

Because the smell of eucalyptus is not particularly good, and secondly, because the production is not particularly easy, and the process is relatively slow.

It has been said that eucalyptus is a dead national tree, but from a scientific point of view, the damage of eucalyptus to the human body lies in the fact that its toxic smell will reduce the body's immunity, but in fact the eucalyptus itself is very valuable.

First, the main wood for papermaking.

Eucalyptus is the main material for papermaking because the tree itself is fast growing and adaptable, so it is widely cultivated in most parts of the world. But why do eucalyptus trees grow so fast? Because eucalyptus trees require more water and nutrients than ordinary trees, some people plant eucalyptus trees in large quantities, which causes the water level in the ground to drop and the soil to desertify.

Eucalyptus trees are very adaptable to the environment, natural selection, the law of survival of the fittest is always prevalent in nature, eucalyptus will deprive other trees of living conditions. Therefore, although eucalyptus is the main wood for papermaking, it is not suitable for planting in large quantities.

Second, the harmfulness of eucalyptus.

It is difficult to grow crops in the area where eucalyptus is planted, and some highly toxic chemicals are used when planting eucalyptus, which are difficult to remove once they are used on land, and may cause a lot of pollution to the water quality and penetrate into the ground, which will cause immeasurable damage if it is drunk by humans and animals. In addition, eucalyptus itself releases hydrocarbons, which combine with carbon dioxide to form ozone, which has a certain degree of damage to the human body.

Third, there is no substitute for economic benefits.

In some areas, eucalyptus trees have been advocated for a ban on planting, but the economic benefits of eucalyptus are irreplaceable. It is understood that if eucalyptus planting is really banned, many forestry enterprises will collapse instantly, so the ban on eucalyptus planting, this requirement is difficult to implement, and the closure of enterprises will lead to unemployment, which will cause other problems. If you want to replace eucalyptus with other trees, you also need to go through a gradual process, eucalyptus cannot be withdrawn from the market all at once, and eucalyptus is still needed.

The first period of eucalyptus has passed, but the future is still a mystery.

Eucalyptus is highly valuable, has a lot of resources to use, is a key material for papermaking, grows quickly, has the potential to damage the environment, and can provide a lot of nutrients.

Eucalyptus is very valuable, it is the main material for papermaking, it will be widely planted in many areas, it can grow quickly, it can provide a lot of resources, and eucalyptus has a transpiration effect.

Eucalyptus is a kind of sclerophyllous tree, which is widely distributed in Guangdong, Guangxi and other places in China. Eucalyptus growth is not good for the environment. It is very easy to lead to desertification.

This tree can reduce the body's immunity, but this tree has a high use value and can be used to make paper.

Eucalyptus trees are beautiful, evergreen, and grow very quickly, with the ability to sprout and renew and improve marshland. It is suitable for landscaping trees. The leaves contain aromatic oil, have the effect of sterilization and mosquito repellent, can be refined sesame oil, and are also a good greening tree species in recuperation areas, residential areas, hospitals and public green spaces.

Twigs and bark contain tannins, which can be used to refine tannin; Bark and wood can also be used to make pulp. Eucalyptus has a long flowering period and a large amount of nectar, making it an important nectar source plant.

Eucalyptus has many uses and has many benefits for its source Australia. However, it absorbs a lot of water and will cause water to dry up; Rapid growth, nutrient absorption too fast, will cause the land nutrient poverty, other plants can not grow. Therefore, where there is a large number of eucalyptus trees, there will be almost no other tree species.

Eucalyptus trees can also kill bacteria and repel mosquitoes, so there are no insects that feed on mosquitoes, and there are no birds that feed on insects. Therefore, eucalyptus planting must be clearly measured and treated carefully.

But in Chinese gardening art, eucalyptus is a plant that is seen as a bad omen. This kind of "giant" in the tree, which can grow up to 30 stories high, is not allowed to be planted by young and middle-aged people, and it is said that the tree will die; If you want to plant this tree, you have to ask the elderly, because when the tree grows, the life expectancy of the tree planter will be about the same.

This product is a macrophyllous eucalyptus of the family Myrtaceae. This product is born on sunny plains, hillsides and roadsides. Leaves can be harvested all year round. It is cultivated in both the south and southwest of our country.

The economic benefits of eucalyptus plantations are currently the best in China's forestry industry. In Zhanjiang, for example, the net profit from planting eucalyptus trees can reach yuan to the first year. acres, in recent years, eucalyptus trees continue to rise, forestry taxes and fees continue to decline, so the profits of afforestation are getting better and better, here, some people are willing to land to rent land for yuan acres to plant eucalyptus, it can be seen that eucalyptus plantations are highly profitable, and I have not heard of restrictions for the time being.

Several native tree species are running out of species, because there is no protection, but they are introducing exotic tree species, endangering the public environment.

What do those bricks think about beasts?

1. Fast growth. Eucalyptus is the fastest growing tree species in the world, growing up to 3 cm tall in a day, 1 m tall in a month, and up to 10 m tall in a year. Brazil has the best growing eucalyptus plantations in the world, with a maximum growth rate of cubic meters per year.

acres, China's experimental forests in Hainan, the highest growth rate reached 4 cubic meters per year. Acres.

2.The rotation period is extremely short. Nordic spruce plantations have a rotation period of 70 years.

The rotation period of Masson pine plantations in China is 20-25 years, the rotation period of fir is 15-20 years, and the rotation period of eucalyptus plantations in southern provinces is 5-7 years, especially in Leizhou Peninsula, and some are even shortened to 3-4 years. Due to its extremely fast growth, the wood produced is mainly used as a raw material for the paper or fiberboard industries, so the short-cycle small-diameter timber business model is very popular.

3.The technology is mature. Eucalyptus is highly adaptable, suitable for intensive management and high-yield cultivation, and is now widely planted all over the world, with a complete set of mature cultivation and management techniques, as long as the varieties are appropriate and the measures are in place, they will be able to obtain high yields.

4.There are few pests and diseases. Since eucalyptus is an exotic tree species and has not been cultivated on a large scale in China for a long time, there are still few large-scale pests and diseases, which is much better than poplars. However, in recent years, the situation of pests and diseases has been expanding.

5.Good economic benefits. The economic benefits of eucalyptus plantations are currently the best in China's forestry industry.

Taking Zhanjiang as an example, the net profit of planting eucalyptus trees can reach 200-500 yuan a year. acres, in recent years, eucalyptus trees continue to rise, forestry taxes and fees continue to fall, so the profits of afforestation are getting better and better, here, some people are willing to 100 acres of land to rent land to plant eucalyptus, it can be seen that eucalyptus plantations are profitable.

The hazards of eucalyptus are: soil hazards, water source hazards, and ecological hazards.

1. Soil hazards

Eucalyptus is a fast-growing plant with a greater demand for water, and the slow root system will penetrate deep into the soil layer and absorb groundwater resources, resulting in a drop in the groundwater level, and long-term planting will reduce the groundwater content and make the soil compact.

2. Water hazards

Although eucalyptus trees are not toxic themselves, they release a toxic gas during their growth, and if they are planted close to water sources, the toxic gases emitted will merge into the water, causing health hazards to people and livestock after drinking.

3. Ecological hazards

Eucalyptus trees require a lot of fertilizer and rely on a well-developed root system to continuously absorb nutrients from the soil to maintain their rapid growth, and the original disturbed vegetation is seriously damaged due to insufficient nutrients, and may even lead to land degradation and even depletion.

Growth habits of eucalyptus trees

1. Temperature: Eucalyptus likes warmth, is not tolerant to severe cold, and generally requires an average annual temperature of more than 15, and the coldest month can not be less than 7 8.

2. Humidity: Eucalyptus likes humidity and is drought tolerant, requiring annual precipitation of more than 500 mm, and annual precipitation of more than 1000 mm grows well.

3. Soil: Eucalyptus has low soil requirements, and is most suitable for growing in acidic red soil, yellow soil and deep alluvial soil.

4. Air: Eucalyptus has strong resistance to air pollution, sulfur dioxide, chlorine, hydrogen fluoride, lead vapor, etc.

5. Light: Eucalyptus trees like a sunny environment, and when the sun is sufficient, the growth is vigorous and dense, and the plant growth is poor in the shade environment.