Tree belowground biomass in Congo Basin forests: allometric equations and scaling with aboveground biomass

IF 3 2区农林科学 Q1 FORESTRY

Forestry Pub Date : 2024-03-05 DOI:10.1093/forestry/cpae009

Alain Franck Kossi Ditsouga, Quentin Moundounga Mavouroulou, Cynel Gwenael Moundounga, Adeline Fayolle, Nicolas Picard, Akinobu Sato, Alfred Ngomanda

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Abstract

Many allometric models to predict tree aboveground biomass have been developed in tropical moist forests, but few models are available for tree belowground biomass. Theory predicts that belowground biomass scales in an isometric way with aboveground biomass. Estimates of belowground biomass could then be derived from aboveground biomass using the root:shoot ratio. Using a dataset of 118 tropical trees for which both aboveground and belowground biomass and other tree and species characteristics were measured in Gabon and Cameroon, we found a near isometric, yet significantly allometric, relationship between belowground biomass (B, in kilograms) and aboveground biomass (A, in kilograms): B = 0.324 A0.939. The root:shoot ratio was 0.20–0.22, regardless of tree size. An efficient model to predict belowground biomass from tree diameter (D, in centimeters), height (H, in meters) and wood density (ρ, in grams per cubic centimeter) was B = 0.0188 (ρD2H)0.977. A significant residual effect of species and leaf habit was found in this model, indicating that further tree and species characteristics are likely to explain additional variation in belowground biomass. Yet, the future development of belowground allometric models can benefit from the many models already developed for aboveground biomass. On the basis of this unprecedented sampling effort on tree belowground biomass in the dense tropical forests of the Congo Basin, we conclude that the scaling of belowground biomass with aboveground biomass should be the relationship to focus on.

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刚果盆地森林树木地下生物量：异速方程及与地上生物量的比例关系

在热带潮湿森林中，已开发出许多预测树木地上生物量的等距模型，但很少有模型可用于预测树木地下生物量。根据理论预测，地下生物量与地上生物量呈等比例关系。因此，地下生物量的估算可以通过根：芽比从地上生物量中得出。利用在加蓬和喀麦隆测量的 118 种热带树木的数据集，我们发现地下生物量（B，以千克为单位）与地上生物量（A，以千克为单位）之间存在近似等距但显著的异比关系：B = 0.324 A0.939。根茎比为 0.20-0.22，与树木大小无关。根据树木直径（D，以厘米为单位）、高度（H，以米为单位）和木材密度（ρ，以克/立方厘米为单位）预测地下生物量的有效模型为 B = 0.0188 (ρD2H)0.977.在该模型中发现了树种和叶片习性的显着残差效应，表明进一步的树木和树种特征可能会解释地下生物量的更多变化。然而，地下生物量异构模型的未来发展可以从已经开发的许多地上生物量模型中受益。在对刚果盆地茂密热带森林中树木地下生物量进行前所未有的采样工作的基础上，我们得出结论，地下生物量与地上生物量的比例关系应该是我们关注的重点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Forestry 农林科学-林学

CiteScore

6.70

自引率

7.10%

发文量

审稿时长

12-24 weeks

期刊介绍： The journal is inclusive of all subjects, geographical zones and study locations, including trees in urban environments, plantations and natural forests. We welcome papers that consider economic, environmental and social factors and, in particular, studies that take an integrated approach to sustainable management. In considering suitability for publication, attention is given to the originality of contributions and their likely impact on policy and practice, as well as their contribution to the development of knowledge. Special Issues - each year one edition of Forestry will be a Special Issue and will focus on one subject in detail; this will usually be by publication of the proceedings of an international meeting.