现代城市,高楼鳞次栉比,电线如麻,时时处处隐藏火患,威胁着人类生命和财产安全。然而,火海之中,人们又可惊奇地发现,住宅旁、道路边的许多绿化树种却精神抖擞,傲然挺立,阻挡着火势的蔓延,俨然成了“镇火英雄”。 原来,绿化树,绝大部分可称得上防火树,它有着特别强大的水分代谢功能,即使在火焰烤燎场合下,通过叶片上的水气剧烈蒸腾。散失热量,使树体温度得以长时间的维持在燃点以下,保存枝体。和普通木材及人体比 Modern cities, row upon row of high-rise buildings, wires such as hemp, always hide fire, threatening human life and property safety. However, among the flames of the sea, people were also surprised to find that many greening trees along the roadside were full of vigor and vitality, standing proudly and blocking the spread of the fire just as the “town hero of fire.” It turned out that green trees, the vast majority can be regarded as fire trees, it has a particularly powerful water metabolism, even in the flame baking occasion, through the leaves of the violent transpiration. Loss of heat, the tree body temperature to maintain a long time below the ignition point, save the branches. And ordinary wood and human ratio