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△1公顷阔叶林,在生长季节每天的消耗1吨二氧化碳,释放0.75吨氧。如按成人计算,每天呼吸需要消耗0.75公斤氧气,排出0.9公斤二氧化碳。城市居民每人平均需要10平方米的森林面积。△1公顷柳杉林,每年可吸收720公斤二氧化硫。洋槐、女贞子还可以吸收氟化氢。△法桐、雪松、柏木、松树、柠檬树等能分泌一种挥发性物质,即植物杀菌素,对细菌、真菌及原生动物有较大的杀灭作用。
△ 1 hectare of broad-leaved forest consumes 1 tonne of carbon dioxide per day in the growing season and releases 0.75 ton of oxygen. If calculated on an adult basis, daily breathing consumes 0.75 kg of oxygen and emits 0.9 kg of carbon dioxide. Urban residents on average need 10 square meters of forest area. △ 1 hectare cedar forest, can absorb 720 kilograms of sulfur dioxide each year. Acacia, Ligustrum lucidum can also absorb hydrogen fluoride. △ Fatong, cedar, cedar, pine, lemon trees can secrete a volatile substance, namely phytoncide, on bacteria, fungi and protozoa have a greater killing effect.