1. Afforestation can keep water and soil, and the vegetation coverage rate is low. During the rainy season, a large amount of sediment will flow into the river, destroying fields, filling the river bed and silting up the estuary, which is extremely harmful. To curb soil erosion, we must plant trees, because the roots of trees are as big as crowns and can hold the soil as firmly as giant hands. The water in the captured soil is continuously absorbed and stored by the roots.
2. Afforestation can prevent wind and fix sand. Wherever the sandstorm blows, the countryside is buried and the city becomes ruins. In order to resist the attack of sandstorm, it is necessary to build shelterbelts to weaken the wind. Once the wind meets the shelter forest, the speed will be reduced by 70% ~80%. If many forest belts are arranged in parallel at a certain distance and grass is planted, the sand blown by wind energy will be reduced.
Afforestation can provide many useful things for human beings. Many fruits and medicinal materials are forest products; Tea, rubber and new carbon are all contributions of trees. Forests are really useful.
4. There are many tiny hairs and mucus on the leaves, which can absorb harmful particles such as carbon and sulfide in the smoke and dust, as well as harmful substances such as germs and viruses, and can also greatly reduce and reduce the dust in the air. A hectare of lawn can absorb more than 30 tons of smoke and dust every year. Therefore, people call green plants "natural vacuum cleaners".
5. Afforestation is a productive activity of building or renewing forests and a basic link of cultivating forests. Planting trees is beneficial to future generations. Ancestors leave shade trees, and later generations enjoy the cool. The basic measures are: suitable land and trees, careful soil preparation, improved varieties and strong seedlings, proper close planting, tending and protection, tool reform and possible irrigation and fertilization.