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中文摘要：
森林作为最大的陆地生态系统，是生物圈中重要的一个环节，它不仅能够为人类提供木材，而且在涵养水源、保持水土、防风固沙、维护大气成分平衡等方面均发挥着重要的生态作用（代力民等，2005）。然而作为森林经营中不可缺少的采伐活动，必定要影响、干扰甚至破坏森林生态系统的平衡。采伐是影响森林景观的关键因子，又是森林经营和可持续发展的核心内容（Ohman，2000）。
英文摘要：
Knowledge about cumulative effects of forest management alternatives on forest landscape is required to make forest management decision. In this paper, a spatially explicit landscape model, LANDIS, was applied to simulate forest landscape changes in 200 years under four management alternatives （no cutting, clearcutting, selective cutting Ⅰ and Ⅱ） in Youhao Forestry Bureau located in Small Khingan Mountains. APACK was used to calculate distribution area of the representative species and species age cohort for six species. The results showed： 1 ） timber harvest decreased area percentage of representative conifer species, Pinus koraiensis, Picea koraiensis and Picea jezoensis, Larix gmelinii to some extent compared to no cutting. The most influencing cutting mode for the area percentage of Tilia amurensis and Quercus mongolica was selective cutting Ⅱ, followed by selective cutting Ⅰ and clearcutting. To the contrast, the change of area percentage of Betula phatyphyUa was contrary to the management alternatives; 2） As to species age cohort composition, timber harvest significantly changed age structure, that is, it decreased over-matured age cohort of representative species, and increased seedling and middle-age cohort （ B. phatyphylla was not included, because its area percentage of over-mature age cohort was the highest under clearcutting than other three scenarios）.
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