How do leaves regulate the climate and purify the environment?

On the green leaves, misty water vapor is discharged from time to time. The evaporation of gaseous water into the atmosphere is called leaf transpiration. Plants need to transpiration about 300-400 kg of water to form 1 kg of dry matter. Transpiration of plant leaves increases the humidity in the air, causing cloudy and foggy weather, increasing rainfall, changing the microclimate of the environment and preventing the occurrence of drought. Transpiration of green plants can spit fog, sow rainfall and reduce drought.

In recent years, scientists have found that the leaves of many plants can secrete fungicides, including pine, cypress, oak, eucalyptus and fir. According to the measurement, 1 hectare pine forest can secrete about 5 kilograms of volatile fungicides into the air every day and night. The secretion of cypress is 30 kilograms, which can kill diphtheria, laryngitis, dysentery and other germs. So the air in coniferous forest is particularly clean and fresh.

With the development of industry and agriculture, a large number of harmful gases such as sulfur dioxide and hydrogen fluoride are emitted in the production process. These harmful gases can be absorbed by the leaves of some plants. For example, in polluted areas, the leaves of oleander can absorb 0.069 grams of sulfur every day. Paulownia, phoenix tree, boxwood, etc. It has a strong ability to absorb hydrogen fluoride and chlorine. The leaves of these plants are purifiers of natural air.

In order to prevent noise, we have to ask the green leaves for help. According to the measurement, the 40-meter-wide forest belt can reduce noise 10- 15 decibels, and the 30-meter-wide forest belt can reduce noise by 6-8 decibels. The effect of tree patches in urban parks is greater, which can reduce the noise by 26-43 decibels. Green streets with lush foliage can reduce noise by 8- 10 decibels.