四年級關(guān)于城市綠化英語作文
Green benefits more, it is much, this is the layman, but it how? What good?
On the earth, whether people or animals, no matter how much you if you want to survive, you must absorb a large number of oxygen, emit large amounts of carbon dioxide at the same time. But the earth is originally stored oxygen is limited, and there are not many, so oxygen should run out in N years ago, oxygen and from where to now? That is about to rely on the green plants.
Green plants can be in the sun for photosynthesis, absorb carbon dioxide to produce oxygen. Research shows that: each plants grow a ton, can produce five tons of oxygen. Absorb one ton of carbon dioxide per hectare of forest land every day, 0.735 tons of oxygen; Grass absorbs 0.9 tonnes of carbon dioxide per day per hectare, produce 0.6 tons of oxygen. So do not have oxygen on earth, as long as there is green in the city can also have the fresh air.
Now, to the rising global temperatures are melting glaciers, frequent floods. Especially in large cities, co2 accumulation is more, the temperature is higher, but if more green belts? , according to the determination of summer temperature of asphalt pavement for 49 degrees Celsius, concrete road surface soil as 46 degrees Celsius, the shade under the road surface to 32 degrees Celsius, the shade under the woods to 28 degrees Celsius. Archaism cloud: Lin deep heat. More green belts can reduce the temperature, heat of heatstroke, prevent pavement thermal expansion, damage to the road.
And big cities noise, dust, green belts and can absorb a lot of dust, purify air, reduce noise, to prevent a variety of disease, create a good living environment.
Green benefits more, not just more generally, for their own, in order to the future of the planet, so why not?
綠化好處多，實在是多，這是婦孺皆知的事情，可它究竟多在哪呢?又有什么好處呢?
在地球上，無論人或動物，無論你多厲害你要想生存下去就必須吸收大量的氧氣，同時放出大量的二氧化碳。可地球是原本儲存的氧氣是有限的，而且并不多，這樣氧氣早該在N年前就用光了，現(xiàn)在的氧氣又從哪里來呢?那就要靠綠色植物了。
綠色植物可以在陽光下進行光合作用，吸收二氧化碳，產(chǎn)生氧氣。研究表明：植物每生長一噸，可產(chǎn)生五噸氧。每公頃林地每天的吸收一噸二氧化碳，產(chǎn)生0.735噸氧氣;每公頃草地每天可吸收0.9噸二氧化碳，產(chǎn)生0.6噸氧氣。這樣一來地球上不就有氧氣了，城市中只要有綠化帶也可以有清新的空氣了。
現(xiàn)在全球氣溫都在日漸升高，導(dǎo)致冰川溶化，水旱災(zāi)害頻繁。尤其在大城市中，二氧化碳積聚較多，氣溫較高，但如果多綠化帶又會如何呢?據(jù)測定，酷夏瀝青路面溫度為49攝氏度，混凝土土路面為46攝氏度，林陰下路面為32攝氏度，林陰下綠陰地為28攝氏度。古語亦云：林深不知暑。綠化帶多了便可降低溫度，消暑納涼，防中暑，防止路面受熱膨脹，損壞路面。
而且城市的噪音大，粉塵多，綠化帶又可以吸收大量的粉塵，凈化空氣，減少噪音，預(yù)防了多種疾病，創(chuàng)造良好的生活環(huán)境。
綠化好處多，還不是一般的多，為了自己，為了地球的未來，何樂而不為呢?
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