不同环境下枫杨生长量及材性的差异分析

The Variation in Growth Increment and Wood Characteristics of Chinese Wingnut (Pterocarya stenoptera) under Different Environment

比较了不同环境下枫杨生长量及材性差异。枫杨纤维长度径向呈“递增—稳定”模式 ,轴向变异是由树干基部 (0 .3m高处 )向上递增 ,至 5 .3m高度达最大值 ,然后递减 ;长宽比变异类似纤维长度的变化 ;纤维长度变化范围为 6 76～ 132 4 μm ,长宽比为 2 7.7～ 5 4 .4。基本密度径向由 0 .32 g/cm3 递增到 0 .4 33g/cm3 ,轴向由0 .35 4g/cm3 递增到 0 .4 39g/cm3 。基本密度与树高、胸径和材积无显著相关 ,与纤维长度、纤维壁厚、长宽比和壁腔比呈极显著正相关 ,而与纤维腔径、腔径比呈极显著负相关。天门和钟祥旱生和湿生 2个不同生态环境及钟祥、天门和武汉 3个地区间 ,枫杨胸径生长量、基本密度、纤维形态和导管形态特征值等无明显差异。

The growth increment and wood characreristics of Chinese Wingnat under different growing conditions have been compared. The result indicates that the fiber length in radial direction increases firstly and then levels off from pith to bark. It increases gradually upward from base,reaches the maximum at 5.3 m ,then decreasea along the stem height. Variation in fiber length-width ratio is similar to that of fiber length. The fiber length and fiber length-width ratios vary from 676 μm and 27.7 to 1 324 μm and 54.4. Specific gravity increases from 0.32 g/cm 3 at pith to 0.433 g/cm3 at bark and it increases from 0.354 g/cm 3to 0.439 g/cm 3 along the stem height. It is significantly and positively correlated with fiber length,fiber wall thickness,fiber length-width ratio or fiber wall lumen ratio and is significantly and negatively correlated with fiber lumen or fiber lumen-diameter ratio. No significant difference was found in the increment of the ring width, the basic density, and the fiber and vessel morphological features under different environments (drought and wet) and in the different settings in Zhongxiang, Tianmen and Wuhan.