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通过对40多年生沙松人工林在不同的郁闭度条件下天然更新的调查,分析了郁闭度与更新幼苗的密度、高生长、径生长的关系及利用天然更新苗更新造林的可行性.“,”Through the investigation of natural regeneration for 40 perennial Abies holophylla plantation under the conditions of different canopy density,analysis the relationship of canopy density and regeneration seedling density 、high growth、diameter growth and the feasibility of utilization natural regeneration seedling reforestation.