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Fine Roots Dynamics in Two Forest Strata of a Semi-Deciduous Forest in Northern Republic of Congo

Open Journal of Forestry 2021年第3期11卷 192-205页

作者： edgard fleury koula Mikieleko Yannick Enock Bocko Grace Jopaul Loubota-Panzou Jean Joël Loumeto Laboratoire de Biodiversité de Gestion des Ecosystèmes et de l’Environnement Université Marien N’GOUABI BP 69 Brazzaville République du Congo

The belowground biomass is represented by coarse and fine roots. Concentrated in the superficial horizons of the soil, the fine roots play a crucial role in the functioning of a forest ecosystem. However, studies on their dynamics in natural forests are almost non-existent in the Republic of Congo. Here, we estimated the biomass, production, turnover and fine root lifespan of two forest strata of a semi-deciduous forest: the Gilbertiodendron dewevrei (De Wild.) J. Léonard forest (GF) and the mixed forest (MF) of land. The ingrowth cores method was used to estimate the biomass, production, turnover and lifespan of fine roots. The results of this study revealed that the biomass, production and fine root turnover of the two forest strata studied significantly decreased with increasing soil depth, with an increase in lifespan. The annual fine root biomass of GF (2284.50 ± 37.62 and 1034.61 ± 14.52 ) was slightly lower than that of MF (2430.07 ± 40.68 and 1043.10 ± 11.75 ) in the 0-15 cm and 15-30 cm horizons, respectively. The annual production of fine roots from these latter horizons was respectively 1300.19 ± 32.17 and 539.18 ± 11.55 in GF and 1362.24 ± 39.59

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Tree Allometry in Tropical Forest of Congo for Carbon Stocks Estimation in Above-Ground Biomass

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Open Journal of Forestry 2014年第5期4卷 481-491页

作者： Romeo Ekoungoulou Xiaodong Liu Jean Joel Loumeto Suspense Averti Ifo Yannick Enock Bocko fleury edgard koula Shukui Niu Laboratory of Ecological Planning and Management College of ForestryBeijing Forestry UniversityBeijingChina Departement de Biologie et Physiologie Vegetales Faculte des Sciences et TechniquesUniversite Marien NgouabiBrazzavilleRepublic of Congo Departement des Sciences Naturelles Ecole Normale SuperieureUniversite Marien NgouabiBrazzavilleRepublic of Congo

The research was aimed to estimate the carbon stocks of above-ground biomass (AGB) in Lesiolouna forest in Republic of Congo. The methodology of Allometric equations was used to measure the carbon stock of Lesio-louna tropical rainforest. The research was done with six circular plots each 40 m of diameter, with a distance of 100 m between each plot, depending on the topography of the site of the installation of these plots. The six studied plots are divided in two sites, which are: Iboubikro and Ngambali. Thus, in the six plots, there are three plots in Iboubikro site and three plots in Ngambali site. The results of this study show that the average carbon stock of aboveground biomass (AGB) in six plots was 170.673 t C ha-1. So, the average of carbon stock of aboveground biomass (ABG) in Iboubikro site was 204.693 t C ha-1 and in the Ngambali site was 136.652 t C ha-1. In this forest ecosystem, the high stock of carbon was obtained in Plot 3, which was in Iboubikro site. Plot 3 contains 20 trees and an average DBH of 24.56 cm. However, the lowest carbon stock was obtained in Plot 4, which was in Ngambali site. Also, Plot 4 contains 11 trees and an average DBH of 31.86 cm. The results of this research indicate that, the forests in the study area are an important carbon reservoir, and they can also play a key role in mitigation of climate change.

关键词： Carbon Stock Allometric Equations Ngambali Iboubikro Above-Ground Biomass

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