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研究4种12年生不同造林密度试验林的生物量变化特点及其分配规律.结果表明:林分及各器官生物量均随密度增加而增加,但当林分密度大于1800株/hm2后,增加速度减缓.下木层、草本层、林分平均木及其各器官生物量,随密度增加而降低.乔木层林分生物量23.78～86.90t/hm2,占群落生物量96%以上.树干、树皮和根所占比例,随密度增加而增加,枝、叶刚好相反;树干生物量占54%～64%,枝占12.45%～20.94%,根占12.83%～14.83%,叶占6.70%～10.77%,皮占7.69%～8.22%.造林密度由稀到密,生物量所占百分比,大径级木分别为42.4%、47.7%、15.3%、6.9%,小径级木分别为6.1%、5.6%、14.2%、32.7%.培育纸浆材林的造林密度可定为3600～4500株/hm2,12年时3000～4050株/hm2.
The biomass characteristics and their distribution patterns of four 12-year-old afforestation plantations with different density were studied.The results showed that the stand biomass and biomass of all organs increased with the increase of density, but increased when the stand density was more than 1800 plants / hm2 The biomass of arborous layer, herb layer, stand average wood and its organs decreased with the increasing of density.The stand biomass of tree layer was 23.78 ~ 86.90t / hm2, accounting for 96% The proportion of bark and root increased with the increase of density, while the branches and leaves had just the opposite. The trunk biomass accounted for 54% ~ 64%, branches accounted for 12.45% ~ 20.94%, roots accounted for 12.83% ~ 14.83%, leaves accounted for 6.70% ~ 10.77 %, And fur accounted for 7.69% ~ 8.22%. The density of afforestation was from thin to dense, and the percentage of biomass was 42.4%, 47.7%, 15.3% and 6.9% %, 14.2% and 32.7%, respectively.The planting densities of pulpwood can be set as 3600 ~ 4500 plants / hm2 and 3000 ~ 4050 plants / hm2 in 12 years.