坡向、坡位对水曲柳中龄林生长与生物量分配的影响

Influence of Aspect and Position of Slope on the Growth and Biomass Allocation of Mid-age Fraxinus mandshurica

水曲柳(Fraxinus mandshurica Rupr.)是我国东北林区珍贵的阔叶用材树种,研究其适宜生长的立地条件具有重要的生态和经济价值。本研究在帽儿山地区水曲柳中龄人工林不同坡向、坡位设置样地,进行胸径、树高的测定,并通过异速生长方程,估计总生物量、地上与地下生物量的分配。结果表明:坡向和坡位对水曲柳中龄林林分的生长有重要影响。坡向对林分平均胸径和优势树高的影响要大于坡位,但双因素方差分析表明,仅坡向对优势树高有显著的影响(P<0.05)。总体而言,西向坡林分生长状况好于东向坡,而且坡下与坡上林分生长状况的优劣,强烈地受到坡向的影响,并且在不同坡向上表现出相反的关系。

Fraxinus mandshurica is a very valuable hardwood species in northeast China, therefore, there are ecological and economic significances to investigate the suitable habitat condition for the growth of F. mandshurica. Effects of aspect and position of slope on the growth and biomass allocation of mid -age Fraxinus mandshurica in Maoershan region were studied, the diameter at breast height （DBH） and tree height were measured and compared, meanwhile, DBH was used to estimate total biomass and below - and above -ground biomass based on the allometry function. The result indicated that both aspect and position of slope affected the growth of mid - age F. mandshurica stand. Aspect of slope play a more important role in DBH and tree height than position of slope, however, two -way ANOVA indicated that only aspect of slope had significant effect on the dominant tree height （ P 〈 0. 05）. In total, the growth of stand located at west - facing slope was better than east - facing slope, in addition, the effect of position of slope on the forest growth Was strongly controlled by aspect of slope, the relationship between different slope position was on the contrary.