Arbor Day uses pictures to draw propaganda slogans.

Green Arbor Day manuscript, Green Arbor Day manuscript photo album

First, the significance of Arbor Day

Afforestation can not only green and beautify homes, but also play a role in expanding forest resources, preventing soil erosion, protecting cultivated land, regulating climate and promoting economic development. This is a grand project for the benefit of present and future generations. In order to protect forestry resources, beautify the environment and maintain ecological balance, many countries in the world have set up Arbor Day according to their own actual conditions. With the enhancement of people's awareness of environmental protection and their active participation in afforestation activities, our living environment will continue to improve.

Some foreign scholars have calculated the ecological value of trees: a 50-year-old tree produces about 365,438+0,200 dollars worth of oxygen; The value of absorbing toxic gases and preventing air pollution is about $62,500; Increase the value of soil fertility by about USD 365,438+USD 0.200; The water saving value is $37,500; Providing breeding grounds for birds and other animals is worth $365,438+$0,250; Resulting in a protein worth $2,500. Excluding the value of flowers, fruits and wood, the total value is about 196000 USD.

As far as the practical value of trees is concerned, it is obvious whether this calculation is accurate.

A tree can produce 200 kilograms of pulp. If these pulps are to produce toilet paper, there must be at least 750 rolls100g of toilet paper.

In the city, a tree can store the pollutants emitted by a car driving 16 km every year. Many trees can absorb harmful gases, for example, 65,438+0 hectares of Cryptomeria fortunei forest can absorb 60 kilograms of sulfur dioxide every day. Other plants, such as Ailanthus altissima, oleander, Ginkgo biloba and Platanus acerifolia, have the function of absorbing sulfur dioxide. When the urban green area reaches more than 50%, the pollutants in the atmosphere can be effectively controlled.

Urban forests can increase air humidity. An adult tree can evaporate 400 kilograms of water a day, so the air humidity in the forest increases obviously. According to calculation, the local summer temperature can be reduced by 0. 1% for every increase in urban green area.

Urban forest belts and hedges can reduce noise. A forest belt with a width of 30 meters can reduce the noise by 6-8 decibels.

There are 3.5 bacteria per cubic meter of air in forest areas, while the number of densely populated cities lacking greening can reach 34,000. Urban streets with trees contain about 80% less bacteria than urban streets without trees.

Urban shelterbelt can slow down the wind speed, its effective range is less than 40 times of tree height, and the best effect is in the range of 10-20 times, which can reduce the wind speed by 50%.

In the farmland forest network, the wind speed can usually be slowed down by 30%-40%, the relative humidity can be increased by 5%- 15%, and the soil water content can be increased by 10%-20%. According to the measurement, the canopy can intercept about 20% precipitation, which greatly weakens the influence of raindrops. As long as there are litter with the thickness of 1 cm on the surface, the surface runoff can be reduced to less than 0. 1/4 of the bare land, and the sediment can be reduced to less than 7% of the bare land.

Compared with bare land, a hectare of woodland can store at least 3000 cubic meters more water. The storage capacity of 1 10,000 mu of forest is equivalent to a reservoir with storage capacity of 1 10,000 cubic meters, and the construction of such a reservoir requires an investment of more than10,000 million yuan.

Some experts predict that if forests are lost on the earth, about 4.5 million biological species will disappear, 90% of fresh water on land will flow into the ocean in vain, and human beings will face serious water shortage. The disappearance of forests will increase the wind speed in many areas by 60%-80%, and hundreds of millions of people will be killed by this wind disaster. ...

Second, the origin of Arbor Day

March 12 is our own Arbor Day and the anniversary of Sun Yat-sen's death. Dr. Sun Yat-sen attached great importance to forestry construction before his death. When he was the interim president of the Republic of China, he established the Ministry of Agriculture and Forestry, and the Mountain Forest Department was in charge of the national forestry administration. 191410/In June, the first forestry law in China's modern history was promulgated, and in July, the government designated the annual "Tomb-Sweeping Day" as Arbor Day.

In February, the 6th meeting of the 5th the NPC Standing Committee passed a resolution to designate March 6th as China Arbor Day. The significance of this resolution lies in mobilizing the people of all ethnic groups in China to actively plant trees and speeding up the pace of greening the motherland and various forestry construction. In China, the date of Sun Yat-sen's death is designated as Arbor Day, which is also to commemorate Sun Yat-sen's great achievements, symbolizing that his unfinished wishes will be realized in new China and will be better realized.

Third, the slogan of Arbor Day

1, bid farewell to the hustle and bustle of the city and embrace green.

2. Greening the environment and beautifying life. Arbor Day slogan

Life is green, so is hope.

4, Arbor Day, give the earth some color, let's move together!

5, Arbor Day, you also come to contribute your own strength, let the earth grow beautiful hair!

6, afforestation, greening the motherland!

7, into the wasteland, green mountains and green waters.

8. People who have no disasters raise trees, while those who have disasters raise people.

9. Planting trees is beneficial, and planting trees will make you rich.

10, get rich for a while; Get rich in the long run, plant a variety of trees.

1 1, predecessors planted trees, and later generations enjoyed the cool.

12, more green leaves and more warmth.

13, if you want a cornucopia, the barren hills will become green forests.

14, protect trees and cover barren hills, so you don't have to eat and wear.

15, there are no trees on the mountain, and crops can't be saved.

16, there are thousands of poplars in the village, so firewood is not needed.

17, vigorously afforestation, prohibit deforestation.

18, afforestation is good today and good in the future.

19, water is the source of life, and trees are the guardians of water.

20, more care, more care, starting from me, care for every grass and tree in the scenic spot.