不同长势黄山木兰生物量分布规律

Distribution Law of Biomass of Magnolia cylindricaat Different Growth Vigor

以顺昌埔上国有林场人工黄山木兰纯林为研究对象,调查其生长情况,分析林分中优势木、平均木、劣势木各器官生物量及其分布规律。结果表明:不同长势黄山木兰平均胸径差异极显著,平均树高差异达到显著以上水平;不同长势黄山木兰各器官生物量和总生物量差异极显著,各器官生物量及其分配率均表现为树干>树根>树枝>树叶,树干生物量分配率均最大,超过60%,而树叶生物量分配低于2%;树干生物量垂直分布呈金字塔状,树枝、树叶生物量垂直方向呈倒金字塔分布;各径级根生物量总体表现为随根系径级的减小而减少,不同长势黄山木兰同径级根生物量分配率与生长势有关。

Taking artificial Magnolia cylindrica in Pushang Forest Farm of Shunchang County as the object,their growth were investigated.The biomass of dominant wood,mean wood and inferior woodand their distribution were analyzed.Resultshows that average DBH of Magnolia cylindricahavesignificant differencesat different growth vigor,and the difference of average tree height is significantly higher;biomassof various organs of Magnolia cylindricahave significant differences with total biomass.Appearance of biomassof each organ for Magnolia cylindricaand its allocation rate is：trunk〉root〉 branch〉leaves,trunk biomass allocation rate is the largest,more than 60%,while the leaf biomass allocation is less than 2%;the vertical distribution of trunk biomass is like pyramid,and the vertical distribution of biomass of branches and leaves is like an inverted pyramid;the biomass of each root at each diameter class reduce with the decrease of root diameter;the total root biomass of each diameter class is decreased with the decrease of root diameter;the biomass distribution rate of Magnolia cylindricais related to the growth vigor at the same diameter class.