Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, Australia.
Ann Bot. 2020 Sep 14;126(4):775-788. doi: 10.1093/aob/mcaa098.
Many experimental studies assume that some topological units are autonomous with regard to carbon because it is convenient. Some plant models simulate carbon allocation, employing complex approaches that require calibration and fitted parameters. For whole-tree canopy simulations, simpler carbon allocation models can provide useful insights.
We propose a new method for simulating carbon allocation in the whole tree canopy considering various scales of carbon autonomy, i.e. branchlets, branches, limbs, and no autonomy. This method was implemented in a functional-structural plant model of growth of individual organs for studying macadamia tree growth during one growing season.
This model allows the simulation of various scales of carbon autonomy in a simple tree canopy, showing organ within-tree variability according to the scale of autonomy. Using a real tree canopy, we observed differences in growth variability within the tree and in tree growth, with several scales of carbon autonomy. The simulations that assumed autonomy at branch scale, i.e. 2-year-old wood, showed the most realistic results.
Simulations using this model were employed to investigate and explain aspects of differences in carbon autonomy between trees, organ growth variability, competition between shoot and fruit growth, and time of autonomy.
许多实验研究假设某些拓扑单位在碳方面是自主的，因为这样比较方便。一些植物模型采用需要校准和拟合参数的复杂方法来模拟碳分配。对于整树冠层模拟，更简单的碳分配模型可以提供有用的见解。
我们提出了一种新的方法，用于模拟整树冠层中的碳分配，考虑了不同尺度的碳自主性，即小枝、树枝、大枝和无自主性。该方法被应用于个体器官生长的功能结构植物模型中，以研究在一个生长季节中澳洲坚果树的生长情况。
该模型允许在简单的树冠层中模拟各种尺度的碳自主性，根据自主性的尺度显示器官在树内的可变性。使用真实的树冠层，我们观察到了树内生长的变异性和树木生长的差异，具有几个尺度的碳自主性。假设树枝尺度自主性（即 2 年生木材）的模拟结果最接近现实。
使用该模型进行了模拟，以研究和解释树木之间碳自主性的差异、器官生长变异性、芽和果实生长之间的竞争以及自主性时间等方面的问题。
