Coffee production in agroforestry systems (AFS) is known as a tool for mitigating climate change. Although, there are allometric models to estimate aboveground biomass of coffee bushes (Coffea arabica L.), allometric models for estimating its belowground components have not been developed yet. In this study, models as a function of easy measurable variables, like stem diameter at 15 cm height (D₁₅), and total height (h) were developed. A total of 40 coffee plants that grow in the four main production systems in the municipality of Líbano, Tolima, Colombia: (1) monoculture; (2) AFS with plantain (Musa AAB); (3) AFS with laurel (Cordia alliodora); and (4) organic, were sampled. Standing bushes were measured (D₁₅ and h), cut at ground level, and their root systems (diameter > 2 mm) were hand-extracted. Both above and belowground biomass (AGB and BGB, respectively) were gravimetrically estimated, as well as the root to shoot ratio (R:S) was estimated. Correlation analysis between dependent and independent variables were performed, and generic models with linear and transformed variables were tested. D₁₅ ranged from 0.6 to 8.0 cm, and h from 0.46 to 3.0 m with a total BGB ranging from 10 g to 2.3 kg/plant. A R:S of 0.49 was estimated with no effect on cultivars and production systems. The best biomass model was BGB = 0.096 + 0.022 * D₁₅²; where BGB: total belowground biomass (kg/plant); D₁₅ (cm); RMSE = 0.30. A model for estimating BGB based on AGB was also developed. These tools allow a highly accurate measuring of the BGB of coffee bushes in the production systems for a research or a carbon credits project.

农林业系统（AFS）中的咖啡生产被称为缓解气候变化的工具。虽然有异速生长模型来估计咖啡灌木地上生物量（小粒咖啡L.），异速生长模型估计其地下组件尚未开发出来。在这项研究中，开发了作为易于测量变量的函数的模型，例如15厘米高的茎直径（D ₁₅）和总高度（h）。哥伦比亚托利马州利巴诺市的四个主要生产系统中共有40种咖啡植物：（1）单作；（2）AFS和车前草（Musa AAB）；（3）AFS与月桂树（Cordia alliodora）; 以及（4）有机。测量直立灌木丛（D ₁₅和h），在地面上切割，然后手工提取其根系（直径> 2 mm）。重量法估算了地上和地下生物量（分别为AGB和BGB），还估算了根与茎的比率（R：S）。进行了因变量和自变量之间的相关性分析，并测试了具有线性和变换变量的通用模型。D _15的范围为0.6至8.0 cm，h的范围为0.46至3.0 m，总BGB范围为10 g至2.3 kg /株。估计的AR：S为0.49，对品种和生产系统没有影响。最佳生物量模型是BGB = 0.096 + 0.022 * D₁₅ ² ; 其中BGB：地下总生物量（千克/植物）；D ₁₅（厘米）; RMSE = 0.30。还开发了基于AGB的BGB估算模型。这些工具可对研究或碳信用额度项目的生产系统中的咖啡灌木丛的BGB进行高精度测量。