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人们把树木称作“大地之肺”或“城市之肺”,这是很有道理的。树木和其他绿色植物一样,在生命活动中进行光合作用的时候,吸收二氧化碳,合成碳水化合物,放出氧气,使大地周围的空气变得洁净,为动物提供生命活动中一刻也不能缺少的氧气。 在松林和一些能释放挥发性物质的树林里,树叶能分泌出臭氧和萜稀、甲醇、有机酸、醚醛、酮等杀菌素,能够杀死大气中的细菌,据科学家分析,一公倾(15亩)榉,松、杨、槐等树种的树林,一昼夜能分泌出30公斤杀菌素,这样数量的杀菌素,能够控制一定空间大气中的细菌数量。有人在南京对树木葱笼的中山陵和人群密集树木稀少的闹市区同时在大气中取样测定,林区每立方
It makes sense that people refer to trees as “lungs of the earth” or “lungs of the city.” Trees, like other greenery, absorb carbon dioxide, synthesize carbohydrates, release oxygen, and clean the air around the earth as the photosynthesis of life activities, providing the animals with oxygen that can not be lacking in their life. In the pine forest and some can release volatile substances in the woods, the leaves can secrete ozone and terpenes, methanol, organic acids, ether aldehydes, ketones and other bactericides, can kill bacteria in the atmosphere, according to scientists, (15 acres) Beech, pine, Yang, Huai and other tree species, day and night can secrete 30 kilograms of spinosad, the amount of spinosad, can control the amount of bacteria in a certain space atmosphere. Some people in Nanjing on the green Cong Chungchuan trees and densely populated densely populated downtown sampling at the same time in the atmosphere, the forest per cubic