CSIRO Sustainable Ecosystems, Private Bag 12, Hobart, Tasmania 7001, Australia.
J Theor Biol. 2010 May 21;264(2):395-406. doi: 10.1016/j.jtbi.2010.02.013. Epub 2010 Feb 16.
In hardwoods such as Eucalyptus spp., xylem (wood) is a heterogeneous tissue consisting of multiple cell types. As such, xylem development involves multiple complex interactions. To describe and understand xylem development, and ultimately predict the resultant wood properties, a process-based approach to modelling wood property variation is potentially very useful. In this paper, a new model (CAMBIUM), which incorporates concepts of these processes, is described. CAMBIUM predicts how wood density and fibre and vessel anatomical properties vary from pith-to-bark at a daily time step as a function of changing environmental conditions and a set of simulated physiological processes. Simulations from an existing process-based model of stand development (CABALA) are used as inputs. A key feature of CAMBIUM is a model of the interaction between different xylem cell types. Some weaknesses were identified in the ability of the model to simulate vessel spatial patterns and frequencies, emphasizing the complexities inherent in this aspect of angiosperm wood formation. The model was, however, able to provide realistic estimates of short-term variation and temporal ranges in eucalypt fibre diameter and secondary wall development and wood density.
在桉树等硬木中，木质部是一种由多种细胞类型组成的异质组织。因此，木质部的发育涉及到多个复杂的相互作用。为了描述和理解木质部的发育，并最终预测木材的特性，基于过程的建模方法来预测木材特性的变化是非常有用的。在本文中，描述了一种新的模型（CAMBIUM），它结合了这些过程的概念。CAMBIUM 预测了随着环境条件的变化和一系列模拟的生理过程，每天木质部密度以及纤维和导管解剖特性从髓心到树皮的变化情况。模拟的输入是来自现有的林分发育的基于过程的模型（CABALA）。CAMBIUM 的一个关键特征是不同木质部细胞类型之间相互作用的模型。该模型在模拟导管空间模式和频率方面的能力存在一些弱点，这强调了被子植物木材形成这一方面所固有的复杂性。然而，该模型能够提供桉树纤维直径和次生壁发育以及木材密度的短期变化和时间范围的现实估计。
