油松根系形态分布的分形分析研究  

Fractal Analysis on Morphology Distribution of the Pinus Tabulaeformis Carr.Root System

作　　者：刘秀萍[1] 陈丽华[1] 宋维峰[1] 吴彦霖[1] 

机构地区：[1]北京林业大学水土保持学院北京林业大学教育部水土保持重点实验室,北京100083

出　　处：《水土保持通报》2007年第1期47-50,54,共5页Bulletin of Soil and Water Conservation

基　　金："973"国家重大基础研究项目(2002CB111502);国家自然科学基金项目(30571531)

摘　　要：基于分形理论和管状模型理论建立了油松根系的三维静态模型。根系模型主要建立在根系拓扑、分枝规律、连结长度、连结直径和根系分枝角度基础上。检测模型主要考虑参数α和q。参数α为根系分枝前后的横截面积之比,q定义分枝后新连结的生物量。虽然参数α和q相对于根系直径独立,但是它们的变化可能影响预测的正确性。在植物水平上,模型提供适当的根系干重,根系全长和根系直径的预测。这一静态模型较适合研究成熟根系,与其它模型相比,该模型的主要优点是它的可塑性和易于应用。A static three-dimensional model of the Pinus tabulaeformis Carr. root system was developed by the fractal and pipe model assumptions. The model was constructed from the observations for topology, branching rules, link length and diameter and root orientation. Evaluation tests were carried out at the plant level. The test principally concerned the coefficients of α and q, where factor α is a ratio of the total cross-sectional area of a root before branching to that afterbranching, and the allocation parameter q defines the new link biomass after branching. Although they are independent of root diameter, the coefficients show some variability that may affect the precision of prediction. The model provides adequate predictions for dry root matter, total root length and root diameter at the plant level. The static model appears to be suitable for the root system of adult trees. Compared with other models, the main advantages of the fractal model are its plasticity and ease of use.

关 键 词：油松 自相似理论 管状模型 根系结构模型 

分 类 号：S711[农业科学—林学]