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树是抽水机、造雨机.一株大树在夏季一天内可由根系从地下吸取几百斤,或近千斤的水.油松生产1公斤有机物,约蒸腾170公斤水.杨树每生产1公斤有机物,约需蒸腾500公斤水.耐旱的油松、樟子松的蒸腾能力在100个大气压左右.森林的一株株树木好比一台台抽水机,不断地把土壤中的水分抽上来,再通过叶面扩散到空气中去,增加空气湿度,降低气温,促进成云致雨.
Tree is a water pump, rain machine. A large tree in the summer day by the root system can absorb from the ground a few hundred pounds, or nearly a kilogram of water .Plant pine production of 1 kilogram of organic matter, transpiration of about 170 kilograms of water. Organic matter, about 500 kg of water to be transposed.Drought-resistant pine, Pinus sylvestris transpiration is about 100 atm.A tree plant in the forest is like a Taiwan-based pump, constantly pumping water from the soil, and then Diffuse into the air through the foliage to increase air humidity, reduce air temperature and promote cloud into the rain.