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在福建省三明市三元区城东乡荆东村,采用树干解析法对不同林龄(10、24、40 a)的杉木人工林生物量及其分配模式进行测定,并采用回归模型:W=a(D2H)b进行生物量拟合。结果表明:W=a(D2H)b可作为3个年龄序列的杉木人工林不同器官生物量的估算模型。杉木人工林不同器官生物量随林龄的增加呈递增趋势,幼龄阶段叶片和枝增长较快,中龄阶段树干增长较快,从中龄林向成熟林过度阶段生物量积累速率减慢。在不同生长阶段,杉木人工林不同器官对总生物量的相对贡献明显不同,其中树干所占比例最大(50.0%~73.4%),且随种植年限呈递增趋势,而根系所占比例随林龄的增加呈递减趋势,说明树干是杉木人工林生物量积累的重要组成部分。
In Jingdong Village, Chengdong Township, Sanyuan District, Sanming City, Fujian Province, biomass and distribution pattern of Chinese fir plantations with different ages (10, 24 and 40 years) were determined by tree trunk analysis. Regression models were as follows: W = a (D2H) b for biomass fitting. The results showed that W = a (D2H) b could be used as an estimation model for biomass of different organs of Chinese fir plantation with three age series. The biomass of different organs of Cunninghamia lanceolata plantation showed an increasing trend with the increase of forest age. The growth of leaves and branches was faster in young stage and faster in mid-aged stage. The accumulation rate of biomass from the middle-aged forest to the mature forest was slowed down. At different growth stages, the relative contributions of different organs of Chinese fir plantation to total biomass were significantly different, among which the proportion of trunk was the largest (50.0% -73.4%) and the increasing trend with planting years, while the proportion of roots with age The increase is decreasing trend, indicating that the trunk is an important part of the biomass of Cunninghamia lanceolata plantation.