保护和经营好现有森林,是实现森林合理经营永续利用的重要基础。而现有森林还能采伐多少年自然也就成为一个重要的基础数据。为此,笔者根据大、小兴安岭、完达山和张广才岭的林业企业局的现有森林资源及消耗状况,略算了现有森林的可利用年限。据统计这些企业现有成过熟林资源约为119852万立方米,年消耗量3223万立方米(计划内2047万立方米,计划外1176万立方米)。据此概算采伐年限为 Protecting and managing the existing forest is an important foundation for realizing sustainable forest management. The number of years the existing forest can be harvested naturally becomes an important basic data. Therefore, based on the existing forest resources and consumption status of the Forestry Bureau of Xiaogan’anling, Wandashan and Zhangguangcailing, the author estimates the useful life of the existing forest. According to statistics, these enterprises have over 1,198.52 million cubic meters of existing mature forest resources and an annual consumption of 32.23 million cubic meters (20.47 million cubic meters under planned and 11.76 million cubic meters outside planned). According to the estimated harvesting period