山地森林占国家森林资源的1/3以上,对国民经济有重要意义。除其本身的原料用途外,还履行着一系列保护自然的职能(防护山区土壤、调节泾流、贮存国家水利资源,因为山区森林是大量河流、小溪的起源),为了维护经营效果,必须评价保护自然的职能。山地森林的水源涵养、防护作用已由科学 Mountain forests make up more than one third of the national forest resources and are of great significance to the national economy. In addition to its own use of raw materials, it also fulfills a series of functions of nature conservation (protection of mountainous soils, regulation of flow, storage of national water resources, as mountainous forests are the origin of numerous rivers and streams) and in order to maintain their operational effectiveness, Evaluate the function of nature protection. Water conservation of mountain forests, the protective effect has been by science