根据塞罕坝三期森林资源清查结果,对塞罕坝森林资源质量、分布格局及动态变化趋势进行了分析。结果表明:在1989—2017年间,森林面积稳步增加,净增森林面积6.1万hm²;林木蓄积净增长752.6万m³;幼龄林、中龄林和近熟林趋于均衡,龄组结构进一步合理;树种结构发生改变,华北落叶松始终占主体地位,樟子松和云杉林比例进一步增加。针对人工纯林和天然次生林存在的问题,提出了建设性的措施和建议。

Based on forest resource inventory data in Saihanba Mechanized Forest Farm,forest resource quality,distribution pattern,and dynamic changes in forest area and volume were analyzed.The results showed from 1989 to 2017,both area and volume of forest resources in study area increased steadily. Saihanba obtained 6.1×10⁴ hm² and 7.52×10⁶ m³ of the net increase in forest area and volume,respectively. The area proportions of young,mid-aged and near mature forests were almost equal,indicating age class structure was gradually reasonable. From the change of tree species structure,Larix principis-rupprechtii was in the dominant position,and the area propotion of Pinus sylvestris var.mongolica and Picea asperata also increased. Based on management problems of plantations and natural secondary forests in the study area,some measures and suggestions were presented.