据报道,印度一位教授曾计算过,一棵正常生长五十年的树,其对社会的贡献,总价值达十九万七千美元。其中生产的氧气价值约为三万一千二百美元;防止大气污染,价值为六万零五百美元;防止土壤浸蚀增加土壤肥力发挥的作用,可创造价值三万一千三百美元;其涵养水源,促进水分再循环的效益,约为三万七千五百美元;为鸟类和其它动物提供栖息环境,价值三百一千二百五十美元。除此,还生产二千五百 It is reported that a professor from India had calculated that a tree that has grown normally for 50 years contributes a total of 197,000 U.S. dollars to the community. Of which the value of oxygen produced is about $ 32,200; the prevention of air pollution is worth 60,500 U.S. dollars; the role of soil erosion prevention in increasing soil fertility can create a value of 31,300 dollars; It benefits from water conservation and water recycling, at about $ 37,500; provides a habitat for birds and other animals at a value of $ 31,250. In addition, it also produced two thousand five hundred