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为估算树木在不同生长环境下的生长量及评价树木与环境之间的相互关系,本文以幼龄杉木为对象,从个体尺度上,根据形态结构生长发育规律,定义了幼龄杉木生长的基本单元,耦合用于表达树木形态发育的L-系统和生理生态模型,形成了L-系统的杉木结构-功能模型。在LSTree软件基础上,集成光合作用、生物量分配等模型,扩展了冠层光合有效辐射(PAR)的空间分布模拟,计算每个叶片上分布的PAR值,为光合作用模型提供核心参数。以福州3-4年生杉木的生长盛期为例,计算不同时刻净光合速率,从而计算各生长阶段的生物量,再把生物量分配到各器官。在生物量驱动下,树木形态结构发生变化,通过迭代,实现生物量驱动下的树木动态生长模拟。净光合速率估算结果与已有相关研究对比,比较合理。这种方法可定量分析、解释植物与环境之间关系。
In order to estimate the growth of trees in different growth environments and evaluate the relationship between trees and environment, this paper takes young Chinese fir as an object and defines the basic growth of young Chinese fir from the individual scales according to the growth and development of morphological structure Units, coupled to represent the L-system and the ecophysiological model of tree morphogenesis, formed the L-system fir structure-function model. Based on the LSTree software, photosynthesis and biomass allocation were integrated to expand the simulation of spatial distribution of photosynthetic active radiation (PAR) in the canopy and calculate the distribution of PAR on each leaf, providing the core parameters for the photosynthesis model. Taking the annual growth of 3-4 years old Chinese fir in Fuzhou as an example, the net photosynthetic rate at different time points was calculated to calculate the biomass of each growth stage, then the biomass was distributed to various organs. Under the driving of biomass, the morphological structure of trees changed, and through the iteration, the dynamic growth simulation of trees driven by biomass was realized. Net photosynthetic rate estimation results compared with the existing relevant research, more reasonable. This method can be quantitatively analyzed to explain the relationship between plants and the environment.