中文摘要：

依据幼龄杉木的野外观测数据和林业专家知识，提取建模约束规则并得出L-系统规则集．利用自主开发的L-系统单树建模工具软件解析规则生成杉木三维结构模型，并将L-系统中的不同迭代步长数同幼龄杉木的不同生长发育阶段相映射，模拟杉木的动态生长，分别得到幼龄杉木随时间（如1—3a）变化的形态结构模型．结果表明，基于L-系统并结合实测数据的几何建模方法可以较好地刻画幼龄杉木形态结构，所提L-系统的迭代步长法能直观地表达实际生长过程中杉木形态结构变化．

英文摘要：

Analyzing the morphology of the Cunningham ia lanceolata based on field observations data and knowledge of forestry experts, the constraint rules for modeling is extracted, and then the L - system rules are obtained. The rules are parsed late the tree＇s dynamic loata is mapped process, the and the 3 D model is generated by our software. To simuactual growth cycle number of the Cunningham ia lanceinto the iterative process, and then the time -various morphologic tree model is formed （e. g. 1, 2 or 3 years old）. The result shows the morphology of young Cunningham ia lanceolata can be modeled realistically, which is based on L -system and field observations data. The simulation of dynamic growth process can intuitively expresses by changing the iteration step in L- system rule.