FORECAST model was used to simulate the long-term effect of different plantation densities on the carbon fixation of Chinese fir plantation, in order to attain the goal of optimizing the management of Chinese fir plantation. The results showed that: along with the increase in plantation density of Chinese fir, the aboveground biological carbon storage, underground biologi-cal carbon storage, total biological carbon storage, soil organic carbon storage, and total carbon storage all increased; but these indexes tended to be stable when the plantation density exceeded 3333 plant/hm2 . When the plantation density was 1667～2500 plant/hm2 , the total biological carbon storage in each rotation felling period decreased. The high-density afforestation could cause the violent competition of sunlight, water and fertilizer among trees, which was not conducive to the carbon accumulation in forest ecosystem. According to different site conditions, the suitable planting density of Chinese fir was 2500～3333 plant/hm2 .%应用FORECAST模型模拟了不同造林密度对杉木人工林固碳的长期影响,达到优化经营杉木人工林的目标.研究表明,随着杉木造林密度的增加,地上生物碳储量、地下生物碳储量、总生物碳储量、土壤有机碳储量、总碳储量都在增加,但密度超过3333株/hm2后趋于稳定;当密度为1667～2500株/hm2时每个轮伐期内的总生物碳储量都在减少;高密度造林会引起种间对光、水、肥等竞争的加剧,不利于森林生态系统的碳积累.根据立地条件的不同,杉木人工林适宜的造林密度应为2500～3333株/hm2.
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