全国约20%的商业林地是公共土地，这些土地同时也蕴藏着大量的铜、汞、镍等矿产。
The public lands contain approximately 20% of the nation's commercial forest land, as well as large amounts of minerals such as copper, mercury, and nickel.
研究、开发并管理森林地区以用于商业和娱乐休闲，保护动植物，预防火灾，病虫灾害。
Studies, develops and manages forest areas to maintain commercial and recreational USES, conserve flora and fauna, and protect against fire, pests and diseases.
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