? When the French planted the first paulownia tree in Shanghai at the end of 19, they probably didn't expect that it would become the king of street trees in Zhengzhou more than a century later. Fraxinus fargesii is an out-and-out alien species, and its environmental pollution in northern cities is quite serious, which should attract everyone's attention. It is the chief culprit of particulate matter in the air in spring, summer and autumn. Its harm to human health is gradual, and it is impossible to detect it in a short time. Therefore, Zhengzhou street trees should plant camphor trees as soon as possible. I will gradually expand this topic below.
? Zhengzhou is located in the Central Plains, with four distinct seasons. There is no severe cold in winter and only ten days of high temperature in summer. The climate is not bad, but it is dry and rainy, and the dust is a bit heavy. Because of inland geography, the general climate can't be compared with the southeast coast and can't be changed, but the microclimate and microenvironment can still be artificially adjusted, such as the urban greening I want to talk about today. We should choose some evergreen trees and flowers that can improve the living environment, make the city not only beautiful, but also more livable, and make people want to go back when they come.
? The author has lived in Zhengzhou for more than 30 years. Today I want to express some cliches about urban greening. Managers in city of hope can see and pay attention to it, so that people can have more happiness and gain more sense of gain. I live near Xintong Bridge, around the community, and there are tall paulownia trees on the roadside, which can't be carried by one person. Most of them are about 60 years old, and their branches extend into the sky. It is also a beautiful scenery of Zhengzhou Greentown to set up shade trees on the road in summer. In spring, there are many herons nesting in trees and giving birth, which is ecologically harmonious.
However, people living under trees are miserable, and listen to me in detail. Bird droppings can be avoided, but it's no harm. However, air cannot be specially supplied, and people share the same fate. Therefore, air quality is particularly important. The bursting of Phalaenopsis cones is polluting the environment and endangering health, which deserves attention. Fatong is also known as Platanus acerifolia. In spring, the fruit balls burst and flew all over the sky. What is unbearable is that the shedding and flying of the Chinese paulownia is a continuous and uninterrupted process that lasts for a long time. Catkin of Populus tomentosa will not disappear until around May Day 10, so it is not enough.
? I have observed that hair loss occurs in spring, spring, summer and autumn, especially in spring and autumn, from sprouting in spring to defoliation in winter. Winter will be much better, which means that hair loss pollution lasts for more than 9 months, which translates into 270 days. People under Fatong must wear three things when they go out: a mask, an eye mask and a scarf. Walking under the road tree, tung hair will fall off, just like a drizzle in spring, and there is no time to rub it. If the wind is stronger, every tree seems to be a huge vacuum cleaner, which is thrown into the air at will. The falling Mao Mao is flying all over the sky with the wind, pervasive. If inhaled into the nose, you will sneeze and have a runny nose. At the entrance, my throat is dry and itchy. For example, when I get stuck in my throat, Mao Mao's eyes itch. It takes a long time to rub, and you have to rinse your mouth with water when you go back. If you get into the collar, it will itch and prick like a flea biting a tick. You have to take a bath at once. It's definitely not good to breathe it into your lungs.
? 90% of air pollution in Zhengzhou in spring, summer and autumn comes from wool pollution of French phoenix tree. Eliminate French phoenix tree as soon as possible and use camphor tree instead.
?
? Usually walking under a tree, on a clear day, the sun scatters thousands of golden lights through the leaves, forming a series of beams. In the shadow of buildings and trees, in the light beam, you can easily see that the air is dirty. A better Mao Mao is flying and will not fall. They flow in a flat layer and are evenly wrapped in air. The hair of Platanus acerifolia may be another important factor causing air pollution. Flying flocs pollute the environment, and the particulate matter exceeds the standard, which endangers the health of citizens and needs to be treated urgently.
With the expansion of the city, paulownia is still widely planted on newly-built roads, and it is spreading rapidly. So far it has not attracted people's attention. We call on the garden department to study and analyze that paulownia can be planted in Nanjing and Shanghai, because it is rainy in the south of the Yangtze River, and the wool can be washed away in time. But the weather in Zhengzhou really shouldn't choose paulownia as a street tree. We should adjust measures to local conditions and consider ecological problems. Harmony between man and nature is the direction of development. The theory of two mountains is not empty talk.
? I have two pertinent suggestions for the reference of the garden department:
? First, I trim it once a year. Five years ago, I went to Paris, France, which is Fatong's hometown. There are more trees and the density is higher than Zhengzhou, but there is no wool pollution. I wonder, is the moon in foreign countries really rounder than that in China? Ask local friends and you will understand that their gardeners prune them every winter. The cost of pruning trees is quite expensive, which is not a small expense for the Paris city government. French gardeners are very experienced. They knew which branch would bear fruit balls, so they cut it off. In spring, branches will not bear fruit balls. This method is very good, but it may not be suitable for our city, because the cost of garden maintenance is too high for us to afford.
Second, phase out paulownia and replace it with camphor tree. The old tree has moved to the edge of the Yellow River, so we should not plant paulownia on the newly opened road. Fatong contributed a lot to beautifying the urban environment 60 years ago, because we were limited by economic and ecological awareness 60 years ago and had no choice. But today's Zhengzhou is not what it used to be, and has become a national central city. Fatong's existence has long been out of date. Now we have more tree species to choose from. For example, the survival rate of Cinnamomum camphora in Zhengzhou is also very high. It is green all year round and is a natural air flavoring agent. The camphor fragrance emitted is faint and fragrant, which can just dilute the sour taste of Zhengzhou automobile burning ethanol. Cinnamomum camphora will not pollute the air. As people's requirements for environmental protection are getting higher and higher, people's health awareness is getting stronger and stronger. It's time to destroy the paulownia and plant camphor.
? If I can't have cool and clean air at the same time in summer, I'd rather choose the latter.
? According to statistics, Zhengzhou ranks first in cancer and first in lung cancer.
Ai Zhengren May 4, 2020