Forestry respond haze and the Three-North Shelterbelt related: one of the words

For the recent severe wind reducing haze whether the Three-North Shelterbelt concerned, the State Forestry Bureau ZHANG Jian said the impact of the Three-North Shelterbelt say there is a haze wind speed is one of the words.

State Council Information Office held a press conference on the 29th, the State Forestry Bureau ZHANG Jian describes "the fifth national desertification and land desertification monitoring" the situation and answered reporters' questions.

ZHANG Jian, said the State Forestry Bureau, afforestation increase certainly affects vegetation on wind speed, in recent years a significant increase in vegetation, significantly reduced the number of days of dust storms, dust storms in Beijing is significantly reduced afforestation around Beijing, Inner Mongolia, a direct result of afforestation and so on, will be able to reduce wind speed. But reduces wind speed is limited, is the surface wind speed. There are specialized research, within one meter of sand flow situation, what is the situation within 10 meters, it is impossible to change atmospheric circulation.

"Fuzhou fresh air occasionally foggy but no haze, a haze over Beijing." ZHANG Jian said that Fujian forest cover 66 percent, the first in the country. It is not because there is a much afforestation haze. Beijing, Tianjin and the forest coverage rate of 23%, just above the national average. Therefore, the Three-North Shelterbelt affect wind speed there is a haze, it can only be said to be one of the words.

ZHANG Jian pointed out, afforestation did not cause haze of fog and haze governance can play a role, but this role is limited, not afforestation can solve haze. Plants plant leaves, there is a lot of biomass. Beijing Forestry University have specialized research, plant adsorption haze is in the affirmative, the leaves will certainly have to absorb some of the haze that can not be converted on the mechanism, which is still under study. We believe that the formation of wind speed atmospheric circulation that made a few trees on the impact of the wind speed, unlikely.

Zhang Yongli, deputy director of the State Forestry Bureau introduced haze formed with two main conditions: First, the emission of pollutants; the second is climate anomalies, especially abnormal atmospheric circulation leads to increase in this kind of weather, pollutants easy to spread, thus forming a haze. The wind was limited to the role of forests near the wind, it did not affect the degree of atmospheric circulation, so this argument lacks scientific basis.

Conversely, increasing forest vegetation helps to reduce soil erosion and surface release dust, in a lower level of dust particles in the atmosphere, weakening conditions haze formation.

According to the latest monitoring results first, from 2009 to 2014, the vegetation coverage of Beijing and Tianjin sandstorm source control project area increased by 7.73 percentage points, corresponding to the amount of soil erosion is reduced 108 million tons Hunshandake sand, surface dust release reduce 3.28 million tons. Trees have a certain lag dust suction effect, and some can also kill germs in the atmosphere, absorbing toxic and hazardous substances or release of the beneficial negative ions, reducing haze on human injury.