请看一棵树的作用小型水库一棵树，相当是一个小型水库。它有着很强的蓄水能力。据研究，每亩林地比无林地可多蓄水２０立方米。目前，我国有森林面积近２０亿亩，就相当于３００多个容量为１亿立方米的大型水库。小型氧气厂一棵树，相当于１个小型氧气厂。据测定，１亩树... Look at the role of a tree Small reservoir A tree, quite a small reservoir. It has a strong water storage capacity. According to the study, more than 20 cubic meters of water can be stored per mu of forest land than without woodlands. At present, China has a forest area of ​​nearly 2 billion mu, equivalent to more than 300 large reservoirs with a capacity of 100 million cubic meters. A small oxygen plant tree, equivalent to a small oxygen plant. It is measured, 1 mu of trees ...