Population modules in different age classes of Karst plant Drepanostachyum luodianense were studied by Harper's modular theory to provide basis for population and community dynamics principle of D. luodianense. The results showed that the 2nd and 3rd classes were the major classes during the assimilation process of D. luodianense module population. Therefore the 2nd and 3rd age-classes should be the main operational object in artificial forest stand control. Clonal ramets ground diameter was determined by the bamboo shoots size (generally about 0.7 cm). The changes of branche length, knots length, and knots number appeared the typical S-shaped growth curve. Natural pruning height raised gradually along with the increase of age and fierce internal population competition, while the maximum branches on stalk decreased.%为了对小蓬竹种群和群落动态发展演化机理提供参考,运用Harper构件理论对不同龄级喀斯特适生植物小蓬竹种群构件进行了研究.结果表明:小蓬竹种群进行同化过程中是以Ⅱ龄级、Ⅲ龄级为主,在人为经营控制小蓬竹林分时,Ⅱ龄级、Ⅲ龄级应是经营主体;小蓬竹分株地径粗度是由竹笋的大小决定的,一般在0.7 cm附近;分株枝条长度、节长、节数的变化则是呈现典型的S形生长曲线;自然整枝高度随着年龄的增加、种群内部竞争的日趋激烈而逐渐增高,同时杆枝上最多分枝数随着年龄的增加、种群内部竞争日趋激烈而逐渐减少.
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