巨桉碳含量的空间结构特征研究

依据永安市巨桉人工林调查的基础,对巨桉碳含量空间结构特征进行了研究,结果表明:巨桉不同胸径个体地上部分各器官的碳含量在42.30%～55.07%之间,地上部分各器官碳含量大小顺序为:叶>枝>干,方差分析表明不同胸径标准木之间碳含量没有达到显著水平,而地上部分各器官碳含量差异显著,采用邓肯新复全距法和q检验法对其进行多重比较,两种方法检验结果均表明巨桉枝和干的碳含量之间没有显著差异,叶和枝以及叶和干之间差异显著;不同高度层叶碳含量之间不存在明显差异,把巨桉单株林木的树冠分为上下两部位,方差分析表明上下两部分叶碳含量也不存在明显差异;不同大小根的碳含量大小顺序为:细根>中根>粗根>根兜;巨桉不同粗细枝的碳含量存在一定的差异,枝越细碳含量的值越高;各器官碳含量中,叶的碳含量较高,为51.86%,果的碳含量最低,为46.62%,排列顺序为:叶>根>枝>干>果。

Spacial structure character of carbon content of Eucalypts grandis

Based on investigation of Eucalypts grandis plantations in Yong'an City,spacial structure character of carbon content of E.grandis was studied.Carbon content of different aboveground organ in different DBH of E.grandis was 42.30%～55.07% and the sequence of aboveground organic carbon content was that leaf(51.86%)>branch(47.64%)>trunk(47.25%);the difference in carbon content of leaf in different height was slight;the carbon content of different diameter of root was increased as diameter became thicker;the carbon content of different diameter of branch was increased as diameter became thicker,too;the sequence of organic carbon content was that leaf>root>branch>trunk>fruit.