1年能吸收固定6吨—60吨二氧化碳,释放5吨—27吨氧气。1年大约可吸收收尘埃330吨—900吨。1个月吸收二氧化硫约60千克。1天大约能分泌出30千克杀菌素,可杀死白喉、伤害、痢疾、肺结核等多种病菌。防风林可以使100公顷农田免受风灾之害。有林地比1公顷无林地大约多蓄水300吨。每年可提供约6立方米木材,还提供饲料、油料,薪炭材等。 1 year can absorb fixed 6 tons -60 tons of carbon dioxide, release 5 tons -27 tons of oxygen. About 1 year can absorb dust collection 330 tons -900 tons. One month to absorb about 60 kilograms of sulfur dioxide. About 1 day to secrete 30 kilograms of bacteriocin, can kill diphtheria, injuries, dysentery, tuberculosis and other germs. Windbreaks protect 100 hectares of farmland from wind damage. There is more than 300 hectares of water in the woodland more than 1 hectare without woodland. Each year about 6 cubic meters of wood can be provided, as well as feed, fuel oil and firewood.