黧蒴栲木材材性、化学组分及热值株内纵向变异模式研究

Longitudinal Variation Patterns of Timber Wood Material Property,Chemical Composition and Calorific Value of Castanopsis fissa

选取湖南省怀化市33年生黧蒴栲(Castanopsis fissa)人工林,利用树干解析,采集木材圆盘样,进行木材材性、化学组分及热值的测定。分别对木材密度、纤维长、纤维宽、纤维长宽比、热值、纤维素含量和酸不溶木素含量等的株内纵向变异规律进行了研究。结果表明:木材密度随树高的增加而逐渐下降,平均值为0.421g/cm3,变异范围为0.356～0.497g/cm3,纵向上的差异达到显著水平;而木材纤维长、纤维素含量和酸不溶木素含量都是随树高的增加先增大后减小,平均值分别为1174.529μm、53.177%和23.661%,变异范围分别为1063.653～1278.946μm、47.135%～56.654%、21.99%～26.226%,纵向上的差异均达到显著水平;木材热值是随树高的增加而逐渐增大的,平均值为17474.76kJ,变异范围为16036.06～18491.86kJ。

Using trunk analysis to collect lumber disc sample to measure the wood material property, chemical composition and calorific value for thirty-three years old planted forest of Castanopsis gssa in Huaihua Hunan Province. The wood density, fiber length, fiber width, fiber aspect ratio, calorific value, cellulose content and acid insoluble lignin content in the strain longitudinal variation law were studied in this paper. The results showed that the density of wood with tree height increased gradually declined, an average of 0.421 g/cm3, the variation range of 0.356-0.497 g/cm3, longitudinal differences reached significant level. And wood fiber length, fiber content and acid insoluble lignin content with the increase of tree height firstly increased, then decreased, the mean respectively 1174.529 um, 53.177% and 23.661% , and the range of variation were 1063.653-1278.946 um, 47.135%-56.654%, 21.99%-26.226%, longitudinal differences significant. Wood calorific value with tree height increased, the average value was 17474.76 kJ, variation range of 16036.06-18491.86 kJ.