中文摘要：

在华南的副热带的区域的代表性的先驱树根系统关于他们的结构被检验，地下的层化；生物资源分发。骨骼根的挖掘；包括 Euphorbiaceae 的七种的好根的观察， Theaceae， Melastomataceae， Lauraceae；Fagaceae 家庭被执行。结果显示出那：(1 ) 在自然继任的第一个阶段的先驱树根具有二种类型，根本系统与笨重 plagiotropic 描绘的分叉；其它与几条平坦的根由扁平的根系统描绘了。迟了的 mesophilous 树根被一明显的根本描绘；策略雌猎犬根起来；下面。灌木种类根被含纤维的根类型两个都展示了由的心描绘水平地；横过地成长的树枝。根形状在继任的不同阶段在不同主导的种类变化了。(2 ) 不同种类的根在外部特征变化了—颜色，周皮；刚切的斜杠的结构。(3 ) 在一套接连著的阶段，树根的生物资源与生长的年龄线性地增加了。在季风期间，全部的根生物资源等于 115.70 t/ha 在常绿树阔叶的森林；在针中的 50.61 t/ha；阔叶的混合森林由具球果的森林统治了；在女人的 64.20 t/ha -- 并且离开针的混合森林由阔叶的 heliophytes 统治了，；比得上在类似的热带森林里观察的地下的生物资源。这是关于在 Dinghushan 的更低的亚热带的区域的森林的根特征的第一份报告，广东，中国。

英文摘要：

Representative pioneer tree root systems in the subtropical area of South China were examined with regard to their structure, underground stratification and biomass distribution. Excavation of skeleton roots and observation of fine roots of seven species including the Euphorbiaceae, Theaceae, Melastomataceae, Lauraceae and Fagaceae families was carried out. The results showed that： （1） Pioneer tree roots in the first stage of natural succession were of two types, one characterized by taproot system with bulky plagiotropic branches; the other characterized by flat root system with several tabular roots. The late mesophilous tree roots were characterized by one obvious taproot and tactic braches roots up and down. Shrub species roots were characterized by heart fibrous root type featured both by horizontally and transversally growing branches. Root shapes varied in different dominant species at different stages of succession. （2） Roots of the different species varied in the external features-color, periderm and structure of freshly cut slash. （3） In a set of successional stages the biomass of tree roots increased linearly with the age of growth. During monsoon, the total root biomass amounted to 115.70 t/ha in the evergreen broadqeaved forest; 50.61 t/ha in needle and broad-leaved mixed forest dominated by coniferous forest; and 64.20 t/ha in broad-and needle-leaved mixed forest dominated by broad-leaved heliophytes, and are comparable to the underground biomass observed in similar tropical forests. This is the first report about roots characteristics of forest in the lower sub-tropical area of Dinghushan, Guangdong, China.