An assessment of recent peat forest disturbances and their drivers in the Cuvette Centrale, Africa

Nesha Karimon, Herold Martin, Reiche Johannes, Masolele Robert N., Hergoualc'H Kristell Anaïk, Swails Erin, Murdiyarso Daniel, Ewango Corneille. 2024. An assessment of recent peat forest disturbances and their drivers in the Cuvette Centrale, Africa. Environmental Research Letters, 19 (10):104031, 25 p.

Type d'url non précisé : https://iopscience.iop.org/article/10.1088/1748-9326/ad6679

Résumé : The largest tropical peatland complex in the Cuvette Centrale is marked by persistent knowledge gaps. We assessed recent peat forest disturbances and their direct drivers from 2019 to 2021 in Cuvette Centrale, spanning the Republic of Congo (ROC) and the Democratic Republic of Congo (DRC). Utilizing peatland maps and Radar for Detecting Deforestation alert data, we analyzed spatial and temporal patterns of disturbances. Further, we examined 2267 randomly sampled peat forest disturbance events through visual interpretation of monthly Planet and Sentinel 2A data to identify direct drivers. Our findings revealed that between 2019 and 2021, about 91% of disturbances occurred in DRC, with hotspots concentrated in the northwest Sud-Ubangi district. Disturbances predominantly followed a sharp seasonal pattern, recurring during the first half of each year with temporal hotspots emerging between February and May, closely associated with smallholder agriculture activities. Smallholder agriculture accounted for over 88% of disturbances in Cuvette Centrale, representing a leading role both in ROC (∼77%) and DRC (∼89%). While small-scale logging contributed 7% to the disturbances in the region, it constituted an important driver (18%) in the ROC. Other drivers included floods, roads, and settlements. Approximately 77% of disturbances occurred outside managed forest concessions in Cuvette Centrale, with 40% extending into protected areas. About 90% of disturbances were concentrated within 1 km of peat forest edges and ∼76% of the disturbances occurred within 5 km of road or river networks. The insights underscore the crucial need for effective peat forest conservation strategies in Cuvette Centrale and can inform national policies targeting peatland protection, aligning with commitments in the Brazzaville Declaration and the Paris Agreement. Further, our findings on direct driver assessment could serve as a reference dataset for machine learning models to automate the visual interpretation and upscale the assessment across the entire region.

Mots-clés Agrovoc : forêt tropicale, télédétection, aménagement forestier, protection de la forêt, déboisement, forêt, politique forestière, exploitation forestière, forêt tropicale humide, tourbière, gestion des ressources naturelles

Mots-clés géographiques Agrovoc : République démocratique du Congo, Congo, Afrique centrale, Indonésie

Mots-clés libres : Peat forests, Peat forest disturbances, RADD alert, Direct drivers, Visual interpretation, Smallholder agriculture, Cuvette Centrale

Agences de financement européennes : European Commission

Agences de financement hors UE : Centre for International Forestry Research, Norwegian Agency for Development Cooperation, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, United States Agency for International Development

Programme de financement européen : H2020

Projets sur financement : (USA) Réduction des émissions provenant de la déforestation et de la dégradation des forêts, (NLD) Open Domain Science, (USA) Sustainable Wetlands Adaptation and Mitigation Program

Auteurs et affiliations

• Nesha Karimon, Wageningen University and Research Centre (NLD) - auteur correspondant
• Herold Martin, Wageningen University and Research Centre (NLD)
• Reiche Johannes, Wageningen University and Research Centre (NLD)
• Masolele Robert N., Wageningen University and Research Centre (NLD)
• Hergoualc'H Kristell Anaïk, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Swails Erin, CIFOR (IDN)
• Murdiyarso Daniel, CIFOR (IDN)
• Ewango Corneille, UNIKIS (COD)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610788/)

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