Palm trees.
Palm trees are evergreen trees up to 15 meters high. The stem is cylindrical, upright, unbranched, with ring-shaped nodes, and the base of the old petiole that is not easy to fall off remains on the nodes. The leaves are clustered on the top of the stem, spreading outward, fan-shaped or circular fan-shaped, 50-70 cm in diameter, palmately deeply lobed, with many strip-shaped lobes, hard, with 2 shallow lobes at the top, not drooping, with many slender longitudinal veins; petiole The petiole is hard, 75-80 cm or even longer, with a leaf sheath at the base, split into fibrous bracts.
Planting 20% ??more trees in big cities will double the benefits of urban forests, such as reducing pollution, carbon emissions and energy consumption. Trees not only purify the surrounding air, but also increase forest coverage in big cities, making cities more livable and sustainable. By planting trees in cities, local residents and visitors can enjoy direct benefits.
Extended information
Benefits of planting trees
1. Trees are oxygen manufacturing plants. One acre of forest can release enough oxygen for 65 people to breathe.
2. Trees can prevent wind and sand, and conserve water and soil. However, the unreasonable development and utilization of natural resources around Beijing is the main cause of ecological imbalance. Indiscriminate deforestation, deforestation, land reclamation, and overgrazing will destroy forests and pastures, cause soil erosion, land desertification, and frequent sandstorms. Unreasonable development and occupation of land have reduced the area of ??cultivated land. It has also caused a shortage of resources in our country.
3. Trees are dust filters. When airflow with heavy dust content passes through the woods, as the wind speed decreases, the larger dust particles in the air will drop rapidly. In addition, some trees have velvet on their epidermis or can secrete oil, which can stick dust to their bodies, thereby greatly reducing the dust content of the airflow passing through the woods.
4. Trees are experts in sterilization. Many trees secrete fungicides during their growth, killing various pathogenic bacteria brought by dust. According to a survey, the number of bacteria in every cubic meter of air is 4 million in department stores, 580,000 on boulevards, 100 in parks, and only 55 in forest areas. The difference in bacteria content in the air between forest areas and department stores is more than 70,000 times.
Baidu Encyclopedia-Palm Tree