目前,我国除少量树皮作为药用或作为特殊用途外,大部分树皮作了燃料。其实数百种树皮可入药,而且很多树皮可以提取护肤品、油漆、染料、添加剂等各类原料。如:栎树就能提取廉价的红、黄优质染料。一般树皮含油量为10%～15%,而桦树皮含油量高达30%。据估计,树一般约占林木体积的8%～12%,充分开发利用树皮的资源,大有可为。 At present, most of the bark has been bred in our country except for a small amount of bark for medicinal purposes or for special purposes. In fact, hundreds of bark can be used as medicine, and many bark can extract various raw materials such as skin care products, paints, dyes and additives. Such as: oak tree will be able to extract cheap red, yellow high quality dyes. The general bark oil content of 10% to 15%, while birch bark oil content up to 30%. It is estimated that the tree generally accounts for about 8% to 12% of the volume of trees, and fully exploit the resources of tree bark.