Modelling the interaction between functioning and organogenesis in a stochastic plant growth model : Methodology for parameter estimation and illustration

P. de Reffye, M. Jaeger, S. Sabatier, V. Letort
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引用次数: 3

Abstract

The complex interaction loops between organogenesis, assimilate production and partitioning are a crucial core component of most functional-structural plant growth model; yet these three processes are seldom fully coupled and there is no consensus on how it should be done. In this context, the use of the internal trophic pressure as a regulating variable of the development processes is an option that has attracted increasing interest in recent years. Generalizing this approach is however hampered by the fact that it is a non-measurable quantity that can be only assessed through model parametric estimation, for which the methodology is not straightforward, especially when the model is stochastic.In this paper, our objectives are (i) to present a stochastic GreenLab model of plant growth (named ‘GL4’) with feedback effect of plant functioning, represented by the ratio of biomass supply to demand, on organogenesis, (ii) to illustrate some of the model properties on a virtual plant featuring the Roux architectural model, and (iii) to present the methodology for its parameter estimation and (iv) its application to two virtual test-cases. Such virtual fitting exercise allows a better understanding of the procedure as well as it thorough evaluation: it is therefore a prerequisite to any future application to real plants
在随机植物生长模型中模拟功能和器官发生之间的相互作用:参数估计和说明的方法
器官发生、同化产物产生和分配之间复杂的相互作用循环是大多数功能结构植物生长模式的关键核心组成部分;然而,这三个过程很少完全结合在一起,对于如何做到这一点也没有达成共识。在这种情况下,利用内部营养压力作为发育过程的调节变量是近年来引起越来越多兴趣的一种选择。然而,推广这种方法受到这样一个事实的阻碍,即它是一个不可测量的数量,只能通过模型参数估计来评估,因此方法并不直接,特别是当模型是随机的时候。在本文中,我们的目标是(i)提出一个随机的GreenLab植物生长模型(命名为“GL4”),该模型具有植物功能的反馈效应,由生物质供需比例表示,对器官发生,(ii)说明具有Roux建筑模型的虚拟植物的一些模型特性,(iii)介绍其参数估计的方法,(iv)将其应用于两个虚拟测试用例。这样的虚拟装配练习可以更好地理解程序以及它的彻底评估:因此,它是任何未来应用于真实工厂的先决条件
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