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森林给人提供木材,还能调节气候、保持水土、防风固沙、改善水质、防烟防尘、消毒杀菌、减少噪声、美化环境、维持和改善生态平衡。如果没有绿色植物不断制造氧气和吸收有害的气体,人... 森林给人提供木材,还能调节气候、保持水土、防风固沙、改善水质、防烟防尘、消毒杀菌、减少噪声、美化环境、维持和改善生态平衡。如果没有绿色植物不断制造氧气和吸收有害的气体,人类就无法生存。人们的健康与空气的优劣有关,而空气得优劣又与森林得多少有关。许多树木都能吸收空气中的有害物质和致癌物质。林区空气中得细菌数量只有无林区得1%.而百货商店内每立方米空气中则含有400多万个细菌。绿化区可以使噪音减弱四分之一左右。森林上空和附近得空气得含水量比无林区多10%--20%;林区降雨量一般比非林区多17%,5亩森林所涵养的水相当于100万立方米容量得水库。树林得绿使人看了舒适,有利于缓和紧张的心情,给人以美的享受。 展开
梦梦心绝痛
2006-11-16
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Forests provide timber people, but also regulating climate, soil and water conservation, fixing and improving water quality, smoke and dust, Sterilization, reduce noise,landscaping, and to maintain and improve the ecological balance.If there are no manufacturing plants continue to absorb oxygen and poisonous gases, humanity could not survive.People's health and quality of the air, and air quality have also how much of the forest.Many trees can absorb harmful substances in air and carcinogenic substances.Forests have air bacteria have only 1% of non-forest areas. And department stores in every cubic meter of air will contain more than 400 million bacteria.The noise can be reduced fourth green area around.Over forest and non-forest areas near the air have more moisture than 10%--20%;Forest rainfall more than 17% of non-forest areas.Conservation of water is equivalent to five acres of forests have one million cubic meters of reservoir capacity.Green trees have watched people comfortable, and conducive to the relaxation of tension in the feelings of people in the United States enjoy.
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tttff
2006-11-16
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i don not down
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