不同落羽杉种源木材化学性质的变异

对16个落羽杉种源的14年生人工林木材化学性质进行了测定，结果表明：(1)16个落羽杉种源木材纤维素相对结晶度、综纤维素含量、木素含量、NaOH抽出物含量和pH等均存在显著差异；(2)16个落羽杉种源木材纤维素相对结晶度在74.43%~61.52%，总平均值为65.87%，总变异系数为5.27%，树干不同高度处木材纤维素相对结晶度含量存在极显著差异。16个种源木材综纤维素含量、木素含量、NaOH抽出物含量和pH等的变异范围分别为62.64%~71.53%、23.98%~29.53%、3.9%~17.9%和5.32%~5.07%，总变异系数分别为3.9%、6.7%、44.8%、1.53%，NaOH抽出物含量变异系数较高。落羽杉树干不同高度处木材综纤维素含量、木素含量、NaOH抽出物含量和pH差异未达显著水平；(3)16个落羽杉种源整体上综纤维素含量高，NaOH抽出物含量和木素含量低，经过进一步筛选后，部分种源可作为优良的纸浆林造林材料进行推广。

A study on chemical properties of wood of bald cypress provenances

The chemical properties of wood of 16 bald cypress ( Taxodium distichum (L. ) Rich.) provenances of 14 years old were determined, and the results were as follows; (1)There were significant difference in wood cellulose crystallinity, holocellulose content, lignin content, NaOH extractives content and pH of wood of 16 bald cypress provenances. (2)The wood cellulose crystallinity of wood of 16 bald cypress provenances was 74.43%-61. 52% , and average was 65. 87% , and total variation coefficient was 5.27% , and there also existed significant variation in wood cellulose crystallinity of different height of trunk. The variation ranges of holocellulose content, lignin content, NaOH extractives content and pH were 62.64%- 71.53% , 23.98%-29.53% , 3.9%-17. 9% and 5. 32%-5.07% respectively, and variation coefficients were 3.9% , 6.7% , 44.8% and 1.53% respectively, but there wasn't significant variation in holocellulose content, lignin content, NaOH extractives content and pH of different height of trunk. (3) On the whole, the holocellulose content of wood of 16 baldcypress provenances was higher, but lignin content and NaOH extractives content were lower, and some provenances could be used as forestation material of pulp wood timber after farther choosing.