Arbor Day is coming. Many people don't know when Arbor Day is. Arbor Day is in March every year 12. The following is my 20-word handwritten newspaper about Arbor Day. Welcome to refer to!
Arbor Day slogan
1, planting trees frequently, Hu environment; Leisure flowers, beautiful land
2. Cherish green and cherish our home.
Step 3 be with the tree
I grew up with Xiao Shu.
5, predecessors planted trees, and later generations enjoyed the cool.
6. Pursue green fashion and move towards green civilization.
7. There are many green leaves and much warmth.
8, you give a little green, I give a little green to make green the main theme of life.
9. I add green to the campus.
10, the joy of gathering trees, may environmental protection stay in our hearts.
1 1. Plant a small tree, and the green side is pure land.
12, pursuing green fashion and moving towards green civilization.
13, Arbor Day, give the earth some color.
14, turn over one more time and leave one more bodhi.
15, start from me and take care of every grass and tree in nature.
16, plant a tree and harvest 10,000 green spots.
17, it is everyone's responsibility to protect flowers, grass and green; Everyone is responsible for picking flowers, logging and destroying green.
18, planting trees and greening Yongjiang land; Planting flowers and grass to decorate Xiongzhen's home.
19, tree planting is in the contemporary era and should be in the next generation.
20. People are round, and Mulinsen is thick and dense.
2 1, take action and strive to be a green messenger.
22, green environment, planting green.
23. It's a pity to step on the green carpet. Why not take a few more steps?
24. The grass has life, and the first step is more "green".
25. The grass smiles at you. Please make a detour.
26, flowers can be directly rewarded, without folding flowers and rewarding branches.
27. I can't help but bring spring scenery into my home.
Plant a tree and a flower, and the world will be better.
29. The flowers you take are short-lived, but the beauty you leave behind is eternal.
30. Fragrance comes from flowers, and beauty needs your care.
3 1, I bloom for your beautiful heart.
32. Make the Earth Younger
33. Go around three or five steps and leave the grass green.
I gave you a scent when I came, and it was clean when I left.
35. The garden is full of red flowers and green grass, and the wind brings flowers and vegetables.
36, green-the source of life
37. I am a bird, flying all the time, not high.
38. Protecting trees means protecting yourself.
39. Distance produces beauty, but close contact is declined.
40. Water is the source of life, and trees are the guardians of water.
Arbor Day. Origin:
March 12 every year is the Arbor Day in China. In fact, this day is the anniversary of Dr. Sun Yat-sen's death. Determine this day as Arbor Day. First, consider the planting season. The second is to commemorate the achievements of Dr. Sun Yat-sen in advocating afforestation all his life.
Sun Yat-sen was the first person in the modern history of China who recognized the importance of forests and advocated afforestation. He personally drafted the political document "Li Shang Hongzhangshu", and proposed that China must "develop agriculture urgently and re-cultivate art" if it wants to be strong.
After the Revolution of 1911, Dr. Sun Yat-sen put forward the plan of large-scale afforestation in North China and Central China. 1924, in a speech in Guangzhou, he emphasized that the fundamental way to prevent floods and droughts is to continuously plant trees and build forests on a large scale. In addition, he repeatedly emphasized the harmfulness of deforestation and the importance of afforestation in many books and speeches, and planted trees himself.
Ecological significance of Arbor Day
Trees are very important to the earth. They not only purify the air and prevent soil erosion, but also provide us with a lot of wood for our use. It has great ecological significance.
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; Absorbing toxic gases to prevent air pollution, worth about $62,500; Increase the value of soil fertility by about $365,438+$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.
Whether this calculation is accurate or not is obvious from the practical value of trees. 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 for one year 16 km. Many trees can absorb harmful gases, such as 1 hectare Cryptomeria fortunei forest, and can absorb 60 kilograms of sulfur dioxide every day. Others, such as Ailanthus altissima, oleander, Ginkgo biloba, Sycamore, etc., all 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, and an adult tree can evaporate 400 kilograms of water a day, so the air humidity in forests is obviously increased. 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 30-meter-wide forest belt can reduce noise by 6-8 decibels.
There are 3.5 bacteria per cubic meter of air in forest areas, while there are 34,000 densely populated cities lacking greening. Urban streets with trees contain about 80% less bacteria than urban streets without trees. Urban shelterbelt can slow down the wind speed, and its effective range is less than 40 times of the tree height, and the best effect is in the range of 10 ~ 20 times, which can reduce the wind speed by 50%. In farmland forest network, wind speed usually slows down by 30% ~ 40%, relative humidity increases by 5% ~ 15%, and soil water content increases 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 is litter with a thickness of 1 cm on the surface, the surface runoff can be reduced to less than 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 cease to exist, 90% of fresh water on land will flow into the sea in vain, and human beings will face serious water shortage. The loss of forests has increased the wind speed in many areas by 60% ~ 80%, and hundreds of millions of people will be killed by the wind disaster.
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