LITERATURE-DERIVED PARAMETERS FOR THE BIOME-BGC TERRESTRIAL ECOSYSTEM MODEL

Ecosystem simulation models use descriptive input parameters to establish the physiology, biochemistry, structure, and allocation patterns of vegetation functional types, or biomes. For single-stand simulations, it is possible to measure required data, but as spatial resolution increases, data availability decreases. Generalized biome parameterizations are then required. Undocumented parameter selection and unknown model sensitivity to parameter variation for larger-resolution simulations are currently the major limitations to global and regional modeling. We present documented input parameters for process-based ecosystem simulation models (specifically for the BIOME-BGC) for major natural temperate biomes. Parameter groups include the following: turnover and mortality; allocation; carbon to nitrogen ratios (C:N); the percent of plant material in labile, cellulose, and lignin pools; leaf morphology; leaf conductance rates and limitations; canopy water interception and light extinction; and the percent of leaf nitrogen in Rubisco (i.e., ribulose bisphosphate-1,5-carboxylase/oxygenase). Input parameters may also be used for other ecosystem models.

生态系统模拟模型借助描述性输入参数，构建植被功能型（vegetation functional types）或生物群系（biome）的生理特性、生物化学过程、结构特征及分配模式。对于单林分模拟而言，所需数据可通过实测获取，但随着空间分辨率提升，可获得的数据量反而下降，此时便需要通用化的生物群系参数化方案。当前，全球及区域生态建模面临的主要局限在于：未对参数选择形成文档记录，且高分辨率模拟中模型对参数变化的敏感性尚不明确。本研究针对主要温带自然生物群系，提供了适用于基于过程的生态系统模拟模型（尤其是BIOME-BGC模型）的文档化输入参数。参数组涵盖以下类别：周转与死亡率、碳分配、碳氮比（C:N）、植物物质在不稳定库、纤维素库与木质素库中的占比、叶片形态学特征、叶片导水率及其限制条件、冠层截水与光衰减过程，以及Rubisco（核酮糖-1,5-二磷酸羧化酶/加氧酶，ribulose bisphosphate-1,5-carboxylase/oxygenase）中的叶片氮占比。本数据集提供的输入参数同样可应用于其他生态系统模型。