Abstract: We investigated more than 130 temporal and permanent sample plots and analyzed more than 120 stems, and collected data of more than 300 temporal and permanent sample plots and 300 analyzed stems. We established a system of DemaerchalkⅠtaper equations by using these analyzed stem data. We calculated and analyzed the timber productivity of young Mongolian Scots pine plantation in eastern mountain regions of Northeast China. The results indicated that by current stand density regime, (1) in young stage (below 40 years old) we can get high-yield small-sized timber but not high-yield pulpwood, not to say large-sized timber; if we hope to get large-sized timber in the young stage, we must adopt a low density system; (2) high planting density and severe thinning regime is favorable to all kind of timber production; and with proper density system;(3)the growth of Mongolian Scots pine can meet the demand of stock increment criterion for fast-growing and high-yield plantation of Mongolian Scots pine plantation in eastern mountain regions of Northeast China.

Key words: Mongolian Scots pine, plantation, taper equation system of DemaerchalkⅠ, site factors, small-sized timber, pulpwood, large-sized timber