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文章采用设标准地进行实验测定的方法．研究了南平溪后２９年生杉木林不同连栽代数林分的生物量．结果表明：２９年生单株杉木各组成所占比例大小顺序为干＞根＞皮＞枝。２代和３代林分中实生平均木的生物量、于皮占总生物量的比例随连栽代数增加均下降．而枝叶和根系所占比例则上升。２代和３代林中实生的生物量、枝叶所占的比重均分别大于相应萌芽的．而根系所占比重则比萌芽的小。２代和３代林分中杉木子皮生物量、林分枝叶生物量、林分根系的生物量、乔木层总生物量均呈下降趋势。说明随连栽代数增加．林分总生物量明显下降．生产力严重衰退。
The article adopts the standard experiment method. The biomass of different continuous planting alluvial forests in 29-year-old Chinese fir plantation was studied. The results showed that the proportions of individual components of 29-year-old Chinese fir were dry> root> bark> branch. The average biomass of wood in the 2nd and 3rd generation forest stands decreased with the increase of the total plant biomass. While the proportion of branches and roots increased. The biomass of the 2nd and 3rd generation forests, the proportion of the branches and leaves were greater than the corresponding budding. The proportion of roots is smaller than budding. The biomass, branch leaf biomass, root biomass and arbor layer biomass of 2nd and 3rd generation stands showed a decreasing trend. Explain that the plantation algebra increases. The stand total biomass decreased significantly. Productivity severely weakened.