Chinanews.com, Beijing, April 21 (Xu Jing) The forecast for the second high incidence period of Beijing willow catkins released by the Beijing Municipal Bureau of Landscaping and Beijing Meteorological Bureau shows that the second high incidence time of flying catkins this year is expected to be April. From 21st to May 12th, it will last about 22 days and will cover the entire "May Day" holiday.
The reporter learned from the Beijing Municipal Bureau of Landscaping on the 21st that at present, the first high-incidence period in Beijing, mainly dominated by poplar fluffy, has basically ended, and the second high-incidence period, dominated by willows and European and American poplars, will come soon.
Affected by last year's rain and other weather factors, the poplar and willow trees in the capital grew robustly this spring, the number of inflorescences and the amount of flying catkins increased significantly compared with previous years, and the period of high incidence of flying catkins was significantly longer than last year.
The picture shows the flying catkins falling from the grass after treatment.
Photo courtesy of Beijing Landscaping Bureau
Willow trees help improve the ecological environment of Beijing
On the morning of the 21st, the reporter saw outside the Grand Canal Forest Park in Tongzhou District that several operating vehicles were spraying water precisely with high pressure on the poplar trees on both sides of the road.
As the water spewed out, the flying catkins fell from the forest to the land under the trees to "settle down", which solved the "spring-limited" troubles of some citizens.
Che Shaochen, a senior engineer at the Beijing Academy of Landscaping Sciences, introduced that these flying catkins are the seeds and derivatives of female willow trees. In order to reproduce the next generation, the trees "send" white flocculent fluff in spring, carrying seeds to find suitable soil. settle down.
In the city, it is difficult for a large number of seeds to quickly find suitable soil, so secondary flying flocs are formed.
Poplars and willows are among the top five native tree species in Beijing and play an important role in the ecological environment of the capital.
As a street tree, willow has an excellent shading effect, with an average crown width of about 7 meters and a maximum length of 30 to 40 meters, which can form a three-dimensional green space; the shading effect of willow canopy helps reduce the intensity of direct sunlight, thereby reducing the environment. temperature to provide more comfortable road space for pedestrians.
In addition, willow trees also have ecological functions such as oxygen release and carbon fixation, cooling and humidification, bacteria reduction and sterilization, absorption of toxic and harmful substances, and dust retention.
Daily research and judgment of key areas at 100 points
This spring, Beijing has implemented precise policies in different time periods and regions to combat the high incidence of flying fox.
In terms of prevention and control time, the city's landscaping departments have strengthened night operations. Every late night, a large number of sweepers will increase humidification and cleaning in key areas, and increase humidification and cleaning again before the evening peak to create a good travel environment for citizens.
At the same time, from 10:00-16:00 every day, during the concentrated cracking period of the female plant fruit sequence, precise high-pressure water spraying is aimed at key areas where the operation is convenient.
In terms of prevention and control areas, Beijing accurately locates 223 key prevention and control areas based on forecasts and daily inspections, strictly guards core areas such as hospitals and schools within the Fifth Ring Road, and focuses on biological control measures; Spray for prevention and control; large vehicles cannot enter the area, focusing on hand-held atomizers for prevention and control.
According to reports, the landscaping department conducts daily research and judgment based on the data of 100 monitoring points and observation points, and timely and accurately guides each district to prevent and control key areas and adopt key technologies on the second day.
At the same time, three-dimensional prevention and control is carried out by measures for fruit order on the tree, flying flocculent in the air, and fruit order on the ground.
Up to now, a total of 350,000 female willow plants have been wetted with water, 30,000 plants have been reshaped and trimmed, more than 4,900 water spraying and cleaning vehicles have been dispatched, and more than 50,000 prevention and control personnel have been dispatched, and the green space and hardened roads have humidified an area of 140 million square meters. rice, effectively reducing the floating of willow catkins in the high-incidence areas of the city.
The picture shows the wet road surface treatment of flying floes by the work vehicle.
Photo by Xu Jing
Multi-department joint efforts to prevent flying fluff throughout the process
Since the Fei Xu period this year, relevant departments in Beijing have divided their labor and cooperated to strengthen security.
Among them, the Beijing Municipal Commission of Urban Management organized various districts and professional sanitation operation units to strengthen the work of humidifying and cleaning urban roads during the flying fox; Ensure the water and emergency water for the prevention and control of willow catkins; the Municipal Public Security Bureau provides temporary traffic protection for special vehicles such as sprinklers and water sprayers during the prevention and control of willow catkins; Publicity and popularization of medical knowledge among the population.
Various departments hold meetings from time to time, and difficult problems encountered are solved in a timely manner.
The Beijing Municipal Bureau of Landscaping requires all districts to establish an emergency service mechanism. A total of 128 special inspection teams and 79 professional emergency prevention and control service teams have been established in the city. All sub-districts, towns, and forest units within the territory are encouraged to establish their own prevention and control service teams. The team is on standby at any time to ensure rapid and timely appearance in areas with severe flying flakes, multi-level and three-dimensional guarantees to timely respond to the high incidence of foul flakes in local areas, improve emergency response capabilities, and reduce the impact of flying flakes.
While carrying out emergency protection for areas with high incidence of flying catkins, the emergency service team for the prevention and control of willow catkins also provides prevention and control guidance and emergency services for all units in Beijing.
Application of fine tree species to suppress flying flakes at the source
It is understood that in addition to timely, efficient and accurate short-term control measures, Beijing will gradually reduce the number of female willow plants through source control.
In order to ensure that high-quality male plants are used in greening construction, the Beijing Municipal Bureau of Landscaping continues to promote the construction of male willow plant resource gardens, ear picking gardens and breeding nurseries. technology, to achieve traceability of the quality of male willow seedlings, to ensure that the seedlings out of the nursery are male, and to avoid confusion between males and females.
Excellent native tree species help to "treat both the symptoms and the root causes" to suppress flying flakes.
In the new round of afforestation and greening construction of one million mu in Beijing, we will select excellent tree species that are local, longevity, stress resistance, food source and aesthetics, continuously optimize the ecological function of woodland and green space, and improve biodiversity; Hybrid structure, scientific application of local perennial ground cover plants to cover the bare ground, forming an effective three-dimensional buffer zone, improving the adsorption and retention of flying flocs, and firmly "sticking" the falling flocs to the ground; The female willow tree is the object of priority replacement; for the dense forest, the female willow tree is selected for thinning, and combined with the replacement of the existing old, weak, disabled, sick and other female willow trees, the fly will be reduced fundamentally. total amount of floc.
It is reported that during the upcoming "May 1st" holiday, Beijing will conduct inspections on the prevention and control of flying flakes.
Each forest-owning unit will set up a special inspection team to conduct inspections in key areas within its jurisdiction; the Municipal Landscaping Bureau will conduct inspections and random inspections in key areas of the city. Citywide notification.
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