The design content and exquisite pictures of the afforestation blackboard newspaper for the first grade

The design content and exquisite pictures of the first grade afforestation blackboard newspaper 1

The design content and exquisite pictures of the first grade afforestation blackboard newspaper 2

The first grade tree planting The design content and exquisite pictures of the afforestation blackboard newspaper 3

The benefits of afforestation

First of all, afforestation can maintain water and soil. Where the vegetation coverage rate is low, there will be heavy rains during the rainy season. A large amount of sediment flows into the river, destroying the fields, filling up the river bed, and blocking the entrance to the sea, causing great harm. To curb soil erosion, we must plant trees, because trees have root systems as huge as tree crowns that can hold onto the soil like giant hands. The captured soil moisture is continuously absorbed and stored by tree roots. According to statistics, one acre of forest can store 20 tons more water than an area without forests.

Secondly, afforestation can prevent wind and sand fixation. Wherever the sand blows, pastoral areas will be buried and cities will turn into ruins. To resist the attack of wind and sand, protective forests must be built to weaken the force of the wind. Once the wind encounters the protective forest, its speed will weaken by 70 to 80 degrees. If many forest belts are arranged in parallel at a certain distance and planted with grass, the amount of sand and gravel blown by the wind will be reduced.

Again, afforestation can provide many useful things to humans. Many fruits and medicinal materials are forest products; tea, rubber, new carbon, etc. also come from forest trees. The use of woods is really great.

In addition, afforestation can completely remove pollution. According to statistics, one acre of forest can absorb 20,000 to 60,000 kilograms of dust in a year, 67 kilograms of carbon dioxide and release 48 kilograms of oxygen every day; it can absorb 4 kilograms of toxic gas sulfur dioxide in one month, and one acre of pine and forest can secrete 2 kilograms of sulfur dioxide in two days and nights. Kilograms of sterilant can kill tuberculosis, typhoid, diphtheria, dysentery and other germs.

Afforestation can also reduce noise, beautify the environment, maintain ecological balance, and provide humans with ideal places to study, work, entertain and live.

Automatic thermostat

In summer, the temperature under the shade of trees is about 10 degrees lower than in the open space, and in winter it is 2-3 degrees higher.

Natural dust collector

There are many fine hairs and mucus on the leaves, which can absorb harmful particles such as carbon and sulfide in smoke, as well as harmful substances such as bacteria and viruses. It can also significantly reduce and reduce dust in the air. One hectare of lawn can absorb more than 30 tons of smoke and dust every year. Therefore, people call green plants "natural dust collectors".

Oxygen manufacturing plant

Leaves in the sun can absorb carbon dioxide and produce the oxygen needed by the human body. According to measurements, one hectare of broad-leaved forest absorbs about one ton of carbon dioxide and releases 700 kilograms of oxygen every day. Therefore, people call green plants "oxygen manufacturing plants".

Bacteria disinfection station

Pine, camphor, elm and other trees can secrete bactericides to kill tuberculosis bacilli, diphtheria bacilli and other germs.

Natural muffler

Greening can also absorb sound waves and reduce noise.