坡位和坡向对长白落叶松纸浆材材性的影响

Effects of Slope Position and Slope Aspect on Wood Properties of Larix olgensis

为研究不同坡位、坡向对长白落叶松(Larix olgensis)纸浆材材性的影响,在东北林业大学帽儿山实验林场,于不同坡向和坡位设置样地并采集木材试样,对木材材性指标测定结果表明:坡向、坡位对长白落叶松基本密度、晚材率、纤维长和纤维宽影响不显著。试样纤维长宽比在不同坡位间差异不显著,但在不同坡向间差异显著,东坡和南坡明显高于北坡。坡向和坡位对长白落叶松木材化学组分(综纤维素、木素、冷水抽提物、热水抽提物、NaOH抽提物、苯—醇抽提物)影响均不明显。生长在上坡和中坡的长白落叶松综纤维素质量分数较高,木素质量分数较低,各种抽提物质量分数亦较低。

A study was conducted to investigate the effects of different slope positions and slope aspects on growth and wood properties of Larix olgensis. Tbe plots at different positions and directions of slope were established in Maoershan Experimental Forest Farm of Northeast Forestry University. Wood samples were collected to determine the wood property indexes. Results showed that the effects of different slope aspects and slope positions on wood basic density, latewood percentage, fiber length and fiber width of L. olgensis were not significant. The positions of slope had no obvious effects but the slope directions had significant effects on fiber length to width ratio, and the fiber length to width ratio of L. olgensis on the east slope and south slope were significantly higher than that on the north slope. The positions and directions of slope had little effect on wood chemical components of L. olgensis, including holocellulose, lignin, cold water extract, hot water extract, NaOH extract, benzene-alcohol extract, etc. Holocellulose content in L. olgensis on the upper and middle slope was higher relatively, but contents of lignin and various extracts were lower.