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人们为了生产和建设,就要不断地改造自然,就要寻求最佳的经济效益和生态效益。随着人类的文明和进步,更需要创造优美的环境。人们每时每刻都要和空气打交道,如果按每人每天呼吸需要0.75公斤氧气,排出0.9公斤二氧化碳计算,则每人应占有10平方米的森林面积。可见,树木与人类健康的关系是很密切的。因此,植树造林意义重大,但栽植什么树种好呢?当然应该因地制宜。这里,我要推荐的是既有较高的生态效益,又有较大经济效益的树种——桑树。一、桑树是净化环境的优良树种一谈到净化环境,就使人们联想到环境污染。目前世界上每1亿人口中约有10万
In order to produce and construct, people must continually transform nature and seek the best economic and ecological benefits. With the civilization and progress of mankind, more needs to create a beautiful environment. People should deal with the air all the time. If they take 0.75 kilograms of oxygen per day for breathing and 0.9 kilograms of carbon dioxide for discharge, they should each occupy 10 square meters of forest area. Can be seen that the relationship between trees and human health is very close. Therefore, afforestation is of great significance, but what kinds of trees should be planted? Of course, they should be adapted to local conditions. Here, I would like to recommend is both a higher ecological efficiency, but also greater economic benefits of the species - Mulberry. First, the mulberry tree is an excellent species to purify the environment Speaking of purification of the environment, make people think of environmental pollution. At present, there are about 100,000 in every 100 million people in the world