Source: CCTV news client
Recently, some citizens on the streets of Dezhou, Shandong Province, found that some poplar trunks planted in urban areas were marked with some symbols distinguishing between "men and women". Why?
Marking symbols distinguish poplars male and female because...
Spring blossoms and the earth springs back. Many areas in the north are about to usher in the furry "April Fly". I believe that many people are impressed by the scene of flying in the northern region that must be on the hot search at this time of year.
Is the picture in your head like this:
Or something like this:
△Image source: China Weather Network
How do these floating in the air, hairy feathers form?
Here you need to do a small popular science ↓ after reading it, you understand why you want to mark the poplar tree with the "male and female" symbol ↓
Poplars are hermaphroditic, and only after the poplars are pollinated and develop seeds, they will produce white flocs, that is, poplar flocs.
Around April, the female flowers of the poplar tree, after fertilization, will develop fruitfully, and the fruit hides the seeds of the blastocyst and is surrounded by villi. After the fruit and seeds have matured, the fruit cracks and the fluff wraps around the seeds and flutters with the wind. This is where the phenomenon of flying in the sky comes from.
Since it is the female poplar tree that flutters, and the male poplar tree that does not flutter, then marking the poplar sex and finding out the female plant can better control the formation of the flying feather.
The symbol mentioned in the opening paragraph to distinguish between "male and female" poplar trees is the identification work done by the staff of the Dezhou Landscaping Service Center in Shandong Province to identify more than 60,000 poplar trees. They identified 39,631 female strains and injected them with flying fluff inhibitors. This inhibits the female poplar from developing a knot, which in turn inhibits the formation of flying feathers.
Many netizens have said that for the first time, they know that poplar trees are actually dioecious! Knowledge up!
There are also many netizens with allergic constitutions who say that inhibiting the formation of reduced fly feathers is too friendly to allergic people!
Why do you still have to plant poplar trees every year?
In the 1960s and 1970s, poplar trees began to be intensively planted in the northern region represented by Beijing. At that time, urban greening was still in its infancy, with limited investment and relatively few tree species to choose from. Poplar tree species have low economic cost, many seedling sources and rapid growth. With these innate advantages, poplar trees have become the main tree species for urban greening.
In addition, poplar tree species can adapt to the northern environment, tall trees, oxygen production, oxygen release and carbon sequestration and other ecological functions, has important ecological value.
Even with so many advantages, a large number of poplar flying feathers still bring a lot of inconvenience to the lives of citizens. At the peak of the flying hair, many citizens said that they did not dare to open the window. In particular, people with allergies such as rhinitis and pharyngitis will cause strong allergic reactions due to inhalation of willow willow and other inhalation into the nasal cavity.
As early as a few years ago, many cities across the country began to promote the governance of the poplar flying problem in an orderly manner. Some areas choose to plant male plants that do not flutter; some renew the tree species year by year, replacing some old, miscellaneous, inferior and dangerous poplar female plants with diversified tree species; and some areas send additional personnel to sprinkle and wash the main streets where poplar trees grow to reduce the amount of flying fluff.
Allergies are easily prevented in this way
After treatment, the problem of flying feathers has been improved year by year, but for susceptible people, it is still very important to do a good job of protection! Xiaobian carefully sorted out some more effective preventive measures, please put away!
1. Outdoor activities can be protected in this way
Pay attention to the time node of frequent fluttering every year, and prepare protective items in advance.
Wear masks, glasses, turbans and other covering items when going out, which can effectively block the inhalation of flying materials.
2. Back indoors can be protected in this way
Eliminate residues such as poplar and willow on the body.
Wash your hands and face in time, and rinse your nasal cavity when necessary to avoid irritation of flying residue.
3. Indoor drifting into the fly can do this
Suction feathers with a vacuum cleaner. It is best not to use a broomstick to prevent Yang Shu from flying.
Use a wet mop to sweep. Wet mops can make yang shu wet and gather into balls to prevent flying.
Mop the floor with a wet mop and wipe the surface of the table and chair with a wet rag. Wet surfaces can effectively adhere to the flying feathers to prevent the flying feathers from flying indoors.
Producer 丨 Lu Yi
Producer 丨 Wu Huifeng
Edited by 丨 Mao Yueyin