植被生态动力学模式中萌衍方案的研究进展

Overview of Establishment Parameterization in Ecological Dynamic Models

萌衍模块是植被生态动力学模式中群体动力学方案的重要组成部分,主要用于描述种子的生产、萌芽以及最终发展成新个体等一系列过程,对植被群落结构和演替起着至关重要的作用。然而,目前其参数化方案较不成熟,不同模式的方案差异较大,且存在众多不确定性。因此,为了提出更加合理的萌衍方案,作者首先从观测角度总结了影响种子生产和传播、种子库以及种子萌发和幼苗存活的各种因素;然后围绕森林林窗模型和全球植被动力学模式的萌衍方案进行较为全面的介绍和评述,重点关注对幼苗个体数增量的计算方案;最后讨论其中存在的不确定性和今后的发展方向。

Establishment submodule is an essential component of the parameterization of population dynamics in ecological dynamic models that describe the full cycle of regeneration by neglecting many of the involved processes, such as flowering, fertilization, and germination. Observations and models show that these processes critically affect ecosystem communities and succession, However, the current parameterizations of establishment are quite different, and have many uncertainties. To develop a more reasonable parameterization of establishment, the factors affecting seed production and spread, seed pools, as well as seed germination in nature are summarized. Then, the parameterizations in forest gap models as well as DGVMs are commented. In addition, the uncertainties introduced by the establishment scheme, and the possible ways to improving it, are also discussed.