基于个体植物生长模型的森林动态演替模拟

Forest dynamic succession simulation based on individual plant growth model

森林动态演替过程的计算模拟历来是森林生态学中的一个重要问题。不同于传统宏观式的模拟思路,本文提出了一种基于个体植物生长模型、自下而上的模拟方法。首先构建了参数化的个体植物生长模型,模型中考虑了植物内部属性、外部环境、邻域竞争3种对植物生长有影响的因素,综合模拟出植物在不同环境状况下的生长变化情况。在此基础上,对构成一片森林的大量植物个体进行遍历式、迭代化的计算,从而模拟出整片森林区域的生长演替现象。实验结果表明,本文方法可以模拟出植被在复杂外部环境影响下的动态变化效果,可表现出自然稀疏、物种竞争、物种演替等多种典型的植被演替现象。

The calculation and simulation of forest dynamic succession is always a significant issue of forest ecology. Different from traditional macroscope simulation way,in this paper,we proposed a bottom-up simulation approach based on individual plant growth model. The parameterized individual plant growth model was constructed firstly considering three influencing factors on plant growth including plant internal attribute,external environment and neighborhood competition,so as to simulate the growth changes in various environments of plant. Under such circumstance,a large amount of plant individuals in a forest would be calculated by the ergodic and iterative way to simulate the growth succession phenomenon in whole forest region. The results of experiment show that the approach in this paper could simulate the dynamic changing effect influenced by complex external environment of vegetation,including various typical rules of vegetation succession such as natural thinning, species competition and species succession.