模型方法是森林碳循环研究的有力工具.在Simulink环境下设计开发了通用的森林生态系统碳循环动态仿真系统FORCASS，从仿真系统的模式框架、设计方案和开发过程方面进行综合分析表明，FORCASS具有可行性.该仿真系统具有如下特点：1）将森林生态系统划分为植被碳库、枯落物碳库、土壤碳库和动物碳库4个分室，考虑了众多碳流转移项，具有较高的机理性和解释性；2）仿真系统基于过程，以植被器官生物量碳储量Richards生长方程为驱动项，带入差分方程组进行计算，可操作性高，能够实现林龄变化下的植被净第一性生产力（NPP）、净生态系统生产力（NEP）等多种输出；3）仿真系统基于通用的碳循环模式框架建立，可扩展性能良好.
Modeling techniques are indispensable for the researches on the carbon cycle of forest ecosystem. In this paper, a new general simulation system FORCASS (FORest CArbon Simulation System) was designed and developed under Simulink environment, with the objectives of modeling the carbon cycle dynamics of forest ecosystems. A comprehensive analysis on the framework, design solution, and development process showed that the FORCASS was feasible. This simulation system had the characteristics of 1) it divided the carbon storage in forest ecosystem into four compartments, i.e., vegetation, litter, soil, and animal, and took into account the carbon flows between the compartments, possessing high mechanism and
easily to be comprehended, 2) it was a processbased system, taking the Richards growth function of vegetation component biomass carbon storage as the input to solve difference equations, and was easily to export the outputs such as net primary productivity (NPP) and net ecosystem productivity (NEP) at different stand ages, and 3) it had the explicit expansibility because it was developed based on a general framework for carbon cycle patterns.