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前言近年来,随着全社会对生态环境保护意识的提高,古树名木以其独具的科研、科普、历史、人文和旅游价值而日益为人们所重视,并成为一个地方的绿色名片。据悉,一棵中等大小(胸径25cm左右)的树木,按其生长50年来计算,其生产氧气的价值为3.1万美元,防止空气污染为6.2万美元,保持水土为3.7万美元,增加肥力为3.1万美元,加上为牲畜遮风挡雨、提供鸟巢和制造蛋白质等所有价值,共值19.6万美元。同时,大树吸收二氧化碳、制造氧气的功能是草坪的5
Foreword In recent years, with the increasing awareness of environmental protection in the whole society, old and famous trees have become more and more valued by people as their unique scientific research, science popularization, history, humanities and tourism value, and have become a green business card in a certain place. It is reported that a tree of medium size (diameter about 25cm), calculated according to its growth 50 years, the value of its production of oxygen is 31,000 US dollars to prevent air pollution was 62,000 US dollars, to maintain soil and water 37,000 US dollars, an increase of fertility 3.1 A million dollars, together with shelter for livestock, the provision of a bird’s nest and the manufacture of protein, are all worth a total of 196,000 U.S. dollars. At the same time, the tree absorbs carbon dioxide and the function of oxygen is lawn 5