地球之肺
The lungs of the earth
在地处亚热带的广州，四季如春，树木常青。树木在街头随处可见。俗语说“金山银山，不如绿水青山。”可见，一个健康的生态系统是十分重要的；而树木在其中又扮演了至关重要的角色。那么树木究竟有什么作用呢？
In Guangzhou, located in the subtropical zone, the four seasons are like spring, and the trees are evergreen. Trees can be seen everywhere on the streets. As the saying goes, "Gold and silver mountains are not as good as green mountains and clear waters." This shows that a healthy ecosystem is very important; And trees play a crucial role in it. So what is the function of trees?
首先，树木可以为人类提供氧气。我们知道空气是人类生存的重要条件之一。而氧气却只占空气的20%，那么人和动物每天都要吸收大量的氧气，放出二氧化碳，氧气由谁来提供和吸收呢？这全要归功于绿色植物。绿色植物叶片上有叶绿素，可以在阳光进行光合作用，吸收二氧化碳，释放氧气。研究表明，植物每生长一吨，再同样的时间里可以多产生五吨的氧气。而树木又是绿色植物中的“老大哥”，所以树木的人类的呼吸作用提供了大量的氧气。来源作文吧 zUowEnBa.nET
Firstly, trees can provide oxygen for humans. We know that air is one of the important conditions for human survival. However, oxygen only accounts for 20% of the air, so humans and animals need to absorb a large amount of oxygen every day, releasing carbon dioxide. Who will provide and absorb oxygen? This is all thanks to green plants. Green plants have chlorophyll on their leaves, which can carry out photosynthesis in sunlight, absorb carbon dioxide, and release oxygen. Research has shown that for every ton of plant growth, an additional five tons of oxygen can be produced in the same amount of time. And trees are the "big brothers" among green plants, so the human respiration of trees provides a large amount of oxygen.
其次，树木可以净化空气，为人类提供避着的地方。由于森林是有遮荫避暑，树林的蒸腾作用也使有许多树林的地方冬暖夏凉。树木的作用不仅如此。据不完全统计，盛夏沥青路温度为49℃，混凝土路面为46℃，林荫下路面为32℃，而林荫下绿荫为28C，正所谓“林深不知着”。同时，绿色植物对空气中的灰尘、粉尘有良好的过滤和吸收作用，并能阻挡粉尘向空气弥散。据测定，大气流通过林带可使携带的粉尘量减少32%-52%，飘尘量减少30%，让空气更加清洁新鲜。
Secondly, trees can purify the air and provide a place for humans to avoid. Due to the fact that forests provide shade to escape the heat, the transpiration of forests also makes areas with many forests warm in winter and cool in summer. The role of trees is not only that. According to incomplete statistics, the temperature of asphalt roads in midsummer is 49 ℃, the temperature of concrete roads is 46 ℃, the temperature of roads under tree shade is 32 ℃, and the temperature of green shade under tree shade is 28 ℃. As the saying goes, 'the depth of the forest is unknown'. At the same time, green plants have good filtering and absorption effects on dust in the air, and can prevent dust from dispersing into the air. According to measurements, atmospheric circulation through forest belts can reduce the amount of dust carried by 32% -52% and the amount of floating dust by 30%, making the air cleaner and fresher.
最后，树林可以降低噪声对人的干扰。当声波通过被风吹摇的树叶时，会明显减弱或消失。实验表明林带可吸收噪音20%-26%，使其强度降低20-25分贝。尤其是在嘈杂的城市中，在道路两旁种植植树木不仅可以降低噪声，减少噪声对人耳膜的损害。且不同的树型还可以美化环境，让人赏心悦目为人们学习、工作和生活提供更理想的环境。
Finally, forests can reduce the interference of noise on people. When sound waves pass through leaves shaken by the wind, they will significantly weaken or disappear. Experiments have shown that forest belts can absorb 20% -26% of noise, reducing its intensity by 20-25 decibels. Especially in noisy cities, planting trees on both sides of the road can not only reduce noise, but also minimize the damage of noise to human eardrums. And different tree shapes can also beautify the environment, making it pleasing to the eye and providing a more ideal environment for people's learning, work, and life.
综上所述，树木的作用真的很大，我们要更好地保护树林，珍惜这不可多得的宝贵自然资源，争取人与自然能更好地和谐相处。
In summary, the role of trees is really significant. We need to better protect forests, cherish this precious natural resource, and strive for better harmony between humans and nature.