When you step into the green forest, you will suddenly feel comfortable and fatigue will disappear. Green in the forest not only brings beautiful scenery to the earth, but also acts on people's central nervous system through various senses, regulating and improving the body's function, giving people a feeling of tranquility, comfort, vitality and spirit, thus improving health.
According to the investigation, the green environment can reduce the secretion of human adrenaline and the excitability of human sympathetic nerve to a certain extent. It can not only make people calm and comfortable, but also reduce the temperature of human skin by 1℃ ~ 2℃, reduce the pulse by 4 ~ 8 times per minute, and enhance the sensitivity of hearing and thinking activities. Scientists have proved through experiments that when the reflectivity of green to light reaches 30% ~ 40%, it can properly stimulate human retina tissue, and it can absorb ultraviolet rays harmful to human eyes in sunlight, so that eye fatigue disappears quickly and the spirit is bright and clear.
According to the research, the plants in the forest, such as Chinese fir, pine, eucalyptus, poplar, juniper and oak, can secrete a monoterpene, sesquiterpene and diterpene gas "bactericide", which has an aromatic smell and can kill diphtheria, typhoid, tuberculosis, dysentery, cholera and other germs in the air. According to the survey, there are 4 million germs in the air per cubic meter in dry and forestless places, while there are only 600,000 germs on the boulevard and dozens in the forest.
Photosynthesis of green plants can absorb carbon dioxide, release oxygen and absorb harmful gases. It is reported that 0.4 hectares of forest belt can absorb and assimilate 100000 kg of pollutants a year. 1 ha Cryptomeria fortunei forest can absorb 720 kilograms of sulfur dioxide every year. So the air in the forest is fresh and clean. According to Japanese scientists, there is a substance in forests and Yuan Ye-negative ions, which is extremely beneficial to human health. It can promote metabolism, make breathing stable, lower blood pressure, be energetic and improve human immunity. It has been measured that there are only forty or fifty negative ions per cubic centimeter in urban houses, one or two hundred in tree-lined places, and more than ten thousand in forests, valleys and grasslands.
In addition, forests also have the function of regulating microclimate. According to the measurement, in hot summer, the temperature of forest land is 3℃ ~ 5℃ lower than that of non-forest land. In the cold and windy winter, the forest can reduce the wind speed and increase the temperature, thus playing the role of warm in winter and cool in summer. In addition, the leaves of plants in the forest have transpiration, which can increase the humidity of the surrounding air.
In a word, forest is the main body of terrestrial ecological environment and the regulator of nature. Protecting the forest is to protect the environment where human beings live, that is, to protect themselves. Let's try our best to protect the big forest and let it benefit mankind!