China News Service, Beijing, April 8 (Xu Jing and Chen Hang) On April 8, the Beijing Municipal Bureau of Landscaping and the Beijing Municipal Meteorological Bureau jointly released the 2022 forecast for the beginning of Beijing's willows and willows.
The forecast shows that Beijing will enter the flying fox period on April 9.
The first high-incidence period of Feixu this year will appear from April 12 to 17, mainly affecting the inner city of the Fifth Ring Road; during the Feixu period, the high-incidence period is from 10:00 to 16:00 every day.
It is understood that the Beijing Municipal Bureau of Landscaping and the Beijing Municipal Bureau of Meteorology have jointly released relevant news for three consecutive years.
The joint forecast is convenient for the public to understand and scientifically respond to the natural phenomenon of willow flying catkins, and at the same time guides the city to carry out comprehensive prevention and control in a precise and scientific manner, so as to minimize the impact of flying catkins on production and life.
Why is there flying catkins in Beijing in spring?
Poplar and willow is a native tree species in Beijing. It has a long history of planting in North China. It has been widely used as a landscape and shelter forest tree species since Liao and Jin, and has made great contributions to Beijing's ecological construction.
As Beijing's iconic plant species, poplar supports Beijing's green "skyline", while willow is one of the earliest sprouting and deciduous tree species in Beijing, carrying the humanistic feelings and strong nostalgia of old Beijing.
Zhang Bo, a senior engineer at the Science and Technology Department of the Beijing Municipal Bureau of Landscaping, introduced that willow trees are dioecious, and the flying catkins come from the female plants of willow trees.
After the female inflorescence is pollinated in spring, small capsules are formed, which are covered with white flocculent fluff, and some seeds less than the size of a sesame grain are hidden in the fluff.
The mature small capsules are gradually split, and the white flocculent fluff carries the seeds and flutters in the wind to reproduce offspring.
Usually in the first ten days of April, the poplar tomentosa in Beijing first enters the flying catkin period, and the catkins start the flying period about 10 days after the poplar catkins are flying.
The impact on the urban area basically ended in early May
It is understood that Beijing has entered the Fei Xu period since April 9 this year, and the impact of Fei Xu on the urban area has basically ended in early May.
This year, the Beijing Municipal Bureau of Landscaping established 10 high-definition real-time observation points. Through real-time observation of the dynamic changes of the fruit order of female willow plants and combined with meteorological conditions, the Association of Landscaping and Meteorological Experts has determined the initial forecast of willow catkins.
According to the forecast, the central and southern urban areas of Beijing will enter the flying fox period from April 9 to 12.
The northeastern part of the city will start to fly from April 11 to 14, and the northwestern part of the city will see flying from April 12 to 15.
The willow catkins have obvious periodicity and seasonality. Due to the differences in tree species and ambient temperature, within the city, the flying catkins period generally lasts from early April to late May, lasting about 50 days.
In local areas, if there is no obvious precipitation, cooling, strong wind, etc., the flying fluff is generally affected for about 20 days, and the high incidence period is generally about a week.
During the flying fox period, the high incidence period is from 10:00 to 16:00 every day.
According to experts' predictions, the first high incidence period of willow willow catkins will appear from April 12 to 17 this year, mainly affecting the inner city of the Fifth Ring Road, and the main species of flying catkins is Populus tomentosa; The area is urban and plain, and the main species of catkin trees are European and American poplars, poplars, weeping willows and dry willows; the third high incidence period is in mid-May, the main area is mountainous areas, and the main species of catkin trees are some European and American poplars, which have no obvious effect on urban areas. Influence.
Protect and don't forget fire safety
Every spring, willow catkins will cause trouble to the lives of some citizens.
In this regard, experts suggest that citizens should take personal protection when going out. Disposable dust masks, sunglasses, goggles, gauze, etc. can effectively block flying fluff; outdoor activities such as outdoor exercise should be selected in the morning. , in the evening or after rain, when the flying fluff is lighter; during the stay at home, please close the screens to prevent flying fluff from flying into the room; when you come back from going out, you can wash your face with water, and use normal saline to clean your nose and mouth.
There are many allergens in spring. Although no research has shown that flying fluff itself can cause allergies, experts still recommend that sensitive people should go to the hospital in time to check for allergens if they have allergic symptoms.
In addition, citizens should also pay attention to fire safety. It is strictly forbidden to throw cigarette butts, and it is strictly forbidden to use open flames to ignite flying catkins to cause accidents. Fire safety is everyone's responsibility.
According to reports, Beijing will continue to strengthen the observation and forecast of flying catkins this year.
At present, each district has established a professional emergency prevention and control service team, and the Beijing Municipal Bureau of Landscaping requires relevant departments to deal with the fly within 30 minutes to ensure that the problem is dealt with in a timely manner and minimize the impact of the fly.
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