Afforestation of gramineous-woody savannah with cocoa agroforestry systems (cAFS) is a common farmer practice in Cameroon considered as sustainable. Nevertheless, the effects of afforestation of savannah with cAFS on soil organic carbon (SOC) turnover and content, and the factors controlling SOC accumulation and stabilization are unknown. SOC content at 0–10 cm soil layer, and SOC distribution in soil particle size fractions (0–20 μm fraction considered as mineral-associated organic carbon, MAOC; 50–2000 μm considered as particulate organic carbon, POC; and 20–50 μm), were compared in different systems settled on degraded savannah (orthic ferralsols). These systems included annual cropland (≈ 5 years old), cocoa monoculture (≈10 years old), and cAFS (from 20 to 60 years old) including different shade tree species such as Albizia adianthifolia, Canarium schweinfurthii, Dacryodes edulis, Milicia excelsa and Ceiba pentandra. Savannah and nearby secondary forest patches were also included in the design as controls. Soil 13C was analysed to investigate the soil carbon turnover after afforestation (C3 plants) of gramineous savannah (C4 plants).
Tag: carbon sinks
All tidal wetlands are blue carbon ecosystems
Managing coastal wetlands is one of the most promising activities to reduce atmospheric greenhouse gases, and it also contributes to meeting the United Nations Sustainable Development Goals. One of the options is through blue carbon projects, in which mangroves, saltmarshes, and seagrass are managed to increase carbon sequestration and reduce greenhouse gas emissions. However, other tidal wetlands align with the characteristics of blue carbon. These wetlands are called tidal freshwater wetlands in the United States, supratidal wetlands in Australia, transitional forests in Southeast Asia, and estuarine forests in South Africa. They have similar or larger potential for atmospheric carbon sequestration and emission reductions than the currently considered blue carbon ecosystems and have been highly exploited. In the present article, we suggest that all wetlands directly or indirectly influenced by tides should be considered blue carbon. Their protection and restoration through carbon offsets could reduce emissions while providing multiple cobenefits, including biodiversity.
Restoration of Rangeland Carbon Sinks for Increased Community Climate Resilience and Agricultural Outcomes: Building a Genderinclusive Interactive Platform for Monitoring and Co-learning
This project will focus on directly addressing key knowledge and capacity gaps to enhance rangeland health monitoring. The Land Degradation Surveillance Framework (LDSF) is designed to provide a biophysical baseline at landscape level, and a monitoring and evaluation framework for assessing processes of land degradation and the effectiveness of rehabilitation measures (recovery) over time.
Four decades of data indicate that planted mangroves stored up to 75% of the carbon stocks found in intact mature stands
Mangroves’ ability to store carbon (C) has long been recognized, but little is known about whether planted mangroves can store C as efficiently as naturally established (i.e., intact) stands and in which time frame. Through Bayesian logistic models compiled from 40 years of data and built from 684 planted mangrove stands worldwide, we found that biomass C stock culminated at 71 to 73% to that of intact stands ~20 years after planting. Furthermore, prioritizing mixed-species planting including Rhizophora spp. would maximize C accumulation within the biomass compared to monospecific planting. Despite a 25% increase in the first 5 years following planting, no notable change was observed in the soil C stocks thereafter, which remains at a constant value of 75% to that of intact soil C stock, suggesting that planting effectively prevents further C losses due to land use change. These results have strong implications for mangrove restoration planning and serve as a baseline for future C buildup assessments.
Improved uncertainties analysis of Indonesia’s Forest Reference Emission Level 2016
Under its Nationally Determined Contribution (NDC), Indonesia has continued to reduce greenhouse gas (GHG) emissions. Reducing emissions from deforestation and forest degradation, the sustainable management of forests, and the conservation and enhancement of forest carbon stocks (REDD+) is a key component of the NDC target from the land sector.
Indonesia submitted its 1st FREL in January 2016 (FREL–2016) covered emissions from deforestation, forest degradation, and peat decomposition. As part of the FREL–2016 improvement, the next FREL should consider land-use change dynamics and emissions/removal in biomass and soil. This improvement needs to reduce the uncertainty of emission factors (EFs) and activity data (AD) including non-CO2 GHGs and reinforce sink monitoring.
Analysis in this working paper aims to improve and re-run the uncertainty in Indonesia’s FREL–2016 by using Monte Carlo simulation (MCS). This working paper is expected to provide recommendations for Indonesia and other wetland-rich countries to meet their conditional land use emission reduction targets through improving the accuracy in their wetlands GHG accounting.
The enduring world forest carbon sink
The uptake of carbon dioxide (CO2) by terrestrial ecosystems is critical for moderating climate change. To provide a ground-based long-term assessment of the contribution of forests to terrestrial CO2 uptake, we synthesized in situ forest data from boreal, temperate and tropical biomes spanning three decades. We found that the carbon sink in global forests was steady, at 3.6 ± 0.4 Pg C yr−1 in the 1990s and 2000s, and 3.5 ± 0.4 Pg C yr−1 in the 2010s. Despite this global stability, our analysis revealed some major biome-level changes. Carbon sinks have increased in temperate (+30 ± 5%) and tropical regrowth (+29 ± 8%) forests owing to increases in forest area, but they decreased in boreal (−36 ± 6%) and tropical intact (−31 ± 7%) forests, as a result of intensified disturbances and losses in intact forest area, respectively. Mass-balance studies indicate that the global land carbon sink has increased, implying an increase in the non-forest-land carbon sink. The global forest sink is equivalent to almost half of fossil-fuel emissions (7.8 ± 0.4 Pg C yr−1 in 1990–2019). However, two-thirds of the benefit from the sink has been negated by tropical deforestation (2.2 ± 0.5 Pg C yr−1 in 1990–2019). Although the global forest sink has endured undiminished for three decades, despite regional variations, it could be weakened by ageing forests, continuing deforestation and further intensification of disturbance regimes. To protect the carbon sink, land management policies are needed to limit deforestation, promote forest restoration and improve timber-harvesting practices.
The forest sector contributes to high emissions worldwide through the loss of historically built-up carbon stocks, mainly from deforestation and forest degradation. The REDD+ approach aims at compensating developing countries for efforts to reduce emissions from deforestation and forest degradation, to maintain and increase forest carbon stocks or to manage forests sustainably. This report examines how, and under which circumstances, different forms of results-based financing are suitable for reducing emissions and enhancing removals in the forest sector in the context of different countries and mitigation measures.
The forest sector contributes to high emissions worldwide through the loss of historically built-up carbon stocks, mainly from deforestation and forest degradation. The REDD+ approach aims at compensating developing countries for efforts to reduce emissions from deforestation and forest degradation, to maintain and increase forest carbon stocks or to manage forests sustainably. This report examines how, and under which circumstances, different forms of results-based financing are suitable for reducing emissions and enhancing removals in the forest sector in the context of different countries and mitigation measures.
The global demand for cocoa has increased. As a result, the area used for cocoa production rapidly increased. Africa alone produces over 70% of the cocoa in the world, with Ghana and Côte d’Ivoire being the main producers. Although listed as a crop that drives deforestation and forest degradation, cocoa farming has the potential to actively contribute to forest restoration. If practised in agroforestry and fallow or degraded areas, it can considerably contribute to biodiversity conservation, climate change mitigation, poverty mitigation, and other services. The Democratic Republic of Congo (DRC), which features a large forest in the Congo Basin (60%), has become a new hotspot for this cash crop. As one of the areas suitable for the development of this crop, which has been grown since colonial times, Tshopo province, DRC, is experiencing rapid increases in its cocoa-growing area. As such, our objective in this study was to track the trajectories of cocoa farming in Tshopo and determine their contributions to climate change mitigation through the restoration of degraded ecosystems. We described all cocoa development initiatives in the Tshopo province, along with their potential responses to climate change.
The global demand for cocoa has increased. As a result, the area used for cocoa production rapidly increased. Africa alone produces over 70% of the cocoa in the world, with Ghana and Côte d’Ivoire being the main producers. Although listed as a crop that drives deforestation and forest degradation, cocoa farming has the potential to actively contribute to forest restoration. If practised in agroforestry and fallow or degraded areas, it can considerably contribute to biodiversity conservation, climate change mitigation, poverty mitigation, and other services. The Democratic Republic of Congo (DRC), which features a large forest in the Congo Basin (60%), has become a new hotspot for this cash crop. As one of the areas suitable for the development of this crop, which has been grown since colonial times, Tshopo province, DRC, is experiencing rapid increases in its cocoa-growing area. As such, our objective in this study was to track the trajectories of cocoa farming in Tshopo and determine their contributions to climate change mitigation through the restoration of degraded ecosystems. We described all cocoa development initiatives in the Tshopo province, along with their potential responses to climate change.