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Research Interests: Ecosystem Services, Carbon, Biomass, Agroforestry, Ecology, and 15 moreCarbon Sequestration, Biodiversity, Clean Development Mechanism, Allometry, C sequestration, Biometrie, Aboveground biomass, Ecosystem service, Agroforesteria, Carbon Stock, Arboles, Biomasse, Elsevier, Carbone, and Agroforesterie
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Background National forest inventory and forest monitoring systems are more important than ever considering continued global degradation of trees and forests. These systems are especially important in a country like Bangladesh, which is... more
Background National forest inventory and forest monitoring systems are more important than ever considering continued global degradation of trees and forests. These systems are especially important in a country like Bangladesh, which is characterised by a large population density, climate change vulnerability and dependence on natural resources. With the aim of supporting the Government’s actions towards sustainable forest management through reliable information, the Bangladesh Forest Inventory (BFI) was designed and implemented through three components: biophysical inventory, socio-economic survey and remote sensing-based land cover mapping. This article documents the approach undertaken by the Forest Department under the Ministry of Environment, Forests and Climate Change to establish the BFI as a multipurpose, efficient, accurate and replicable national forest assessment. The design, operationalization and some key results of the process are presented. Methods The BFI takes advan...
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Models to assist management of lowland forests in Tanzania are in most cases lacking. Using a sample of 60 trees which were destructively harvested from both dry and wet lowland forests of Dindili in Morogoro Region (30 trees) and Rondo... more
Models to assist management of lowland forests in Tanzania are in most cases lacking. Using a sample of 60 trees which were destructively harvested from both dry and wet lowland forests of Dindili in Morogoro Region (30 trees) and Rondo in Lindi Region (30 trees), respectively, this study developed site specific and general models for estimating total tree volume and aboveground biomass. Specifically the study developed (i) height-diameter (ht-dbh) models for trees found in the two sites, (ii) total, merchantable, and branches volume models, and (iii) total and sectional aboveground biomass models of trees found in the two study sites. The findings show that site specific ht-dbh model appears to be suitable in estimating treeheightsince the tree allometry was found to differ significantly between studied forests. The developed general volume models yielded unbiased mean prediction error and hence can adequately be applied to estimate tree volume in dry and wet lowland forests in Tan...
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Accurately monitoring tropical forest carbon stocks is an outstanding challenge. Allometric models that consider tree diameter, height and wood density as predictors are currently used in most tropical forest carbon studies. In... more
Accurately monitoring tropical forest carbon stocks is an outstanding challenge. Allometric models that consider tree diameter, height and wood density as predictors are currently used in most tropical forest carbon studies. In particular, a pantropical biomass model has been widely used for approximately a decade, and its most recent version will certainly constitute a reference in the coming years. However, this reference model shows a systematic bias for the largest trees. Because large trees are key drivers of forest carbon stocks and dynamics, understanding the origin and the consequences of this bias is of utmost concern. In this study, we compiled a unique tree mass dataset on 673 trees measured in five tropical countries (101 trees > 100 cm in diameter) and an original dataset of 130 forest plots (1 ha) from central Africa to quantify the error of biomass allometric models at the individual and plot levels when explicitly accounting or not accounting for crown mass variat...
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The paper provides (1) an overview of the current status of tree volume and biomass allometric equations in North America, (2) investigate how uncertainty associated to the national biomass carbon estimation in Mexico may be affected by... more
The paper provides (1) an overview of the current status of tree volume and biomass allometric equations in North America, (2) investigate how uncertainty associated to the national biomass carbon estimation in Mexico may be affected by the decision tree employed for the selection of biomass allometric equations (3), identify the gaps and future needs, (4) provide recommendations for volume, biomass and carbon stock assessment, and (5) provide examples of how to use the database and select the appropriate equation. The report analyses the various tree allometric equations and identify their potential for assessing national volume, biomass and carbon stocks and the validity and suitability for use in species that are found under the country’s climatic characteristics.
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ABSTRACT Soils make up the largest carbon reservoir, since they contain twice as much carbon as the atmosphere and almost three times as much as the biomass of aerial and root systems. Even a slight variation in soil carbon stocks can... more
ABSTRACT Soils make up the largest carbon reservoir, since they contain twice as much carbon as the atmosphere and almost three times as much as the biomass of aerial and root systems. Even a slight variation in soil carbon stocks can have significant consequences for atmospheric CO, concentrations. The aim of this study is to investigate the influence of forest planting in Latin America on organic carbon stocks in soils (Cos). A meta-analysis of 21 records in the bibliography shows that converting "cerrado" savannah or natural growing forest into plantations lowers the amount of Cos in the first twenty centimetre (respectively -6.09 +/-2.19 et -16.5 +/-4.63 kgC/m(2)) and. Conversely, increasing the density of agro-forests, the amount of Cos in the first twenty centimetre (+1.29 +/-1.02 kgC/m(2)). Converting pasture lands into forest plantations does not systematically induce a significant effect on Cos. The option of using meta-analysis and modelling has proved to be of particular interest in scientific disciplines where the necessary data are scarce as well as costly.
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In the context of the adoption at the 16th Conference of the Parties in 2010 on the REDD+ mitigation mechanism, it is important to obtain reliable data on the spatiotemporal variation of forest carbon stocks and changes (called Emission... more
In the context of the adoption at the 16th Conference of the Parties in 2010 on the REDD+ mitigation mechanism, it is important to obtain reliable data on the spatiotemporal variation of forest carbon stocks and changes (called Emission Factor, EF). A re-occurring debate in estimating EF for REDD+ is the use of existing field measurement data. We provide an assessment of the use of commercial logging inventory data and ecological data to estimate a conservative EF (REDD+ phase 2) or to report on EF following IPCC Guidance and Guidelines (REDD+ phase 3). The data presented originate from five logging companies dispersed over Gabon, totalling 2,240 plots of 0.3 hectares.We distinguish three Forest Types (FTs) in the dataset based on floristic conditions. Estimated mean aboveground biomass (AGB) in the FTs ranges from 312 to 333 Mg ha−1. A 5% accuracy is reached with the number of plots put in place for the FTs and a low sampling uncertainty obtained (± 10 to 13 Mg ha−1). The data coul...
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A globally integrated carbon observation and analysis system is needed to improve the fundamental understanding of the global carbon cycle, to improve our ability to project future changes, and to verify the effectiveness of policies... more
A globally integrated carbon observation and analysis system is needed to improve the fundamental understanding of the global carbon cycle, to improve our ability to project future changes, and to verify the effectiveness of policies aiming to reduce greenhouse gas emissions and increase carbon sequestration. Building an integrated carbon observation system requires transformational advances from the existing sparse, exploratory framework towards a dense, robust, and sustained system in all components: anthropogenic emissions, the atmosphere, the ocean, and the terrestrial biosphere. The paper is addressed to scientists, policymakers, and funding agencies who need to have a global picture of the current state of the (diverse) carbon observations. We identify the current state of carbon observations, and the needs and notional requirements for a global integrated carbon observation system that can be built in the next decade. A key conclusion is the substantial expansion of the groun...
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ABSTRACT On the basis of the current negotiations under the United Nations Framework Convention on Climate Change, REDD+ (reducing emissions from deforestation and forest degradation and the role of conservation, sustainable management of... more
ABSTRACT On the basis of the current negotiations under the United Nations Framework Convention on Climate Change, REDD+ (reducing emissions from deforestation and forest degradation and the role of conservation, sustainable management of forests and enhancement of forest carbon stocks in developing countries) is to become a mechanism that mobilizes financial resources to developing countries to fund climate change mitigation activities. To achieve this goal, it is essential that the appropriate infrastructure be established to support such activities, in the shape of a common approach to measurement, reporting and verification (MRV) for REDD+ activities: an operational national forest greenhouse gas (GHG) inventory. In particular, in the light of more frequent future reporting requirements, a national inventory system (NIS) for GHG inventories is required for non-Annex I Parties in order to ensure permanent MRV. Given the limited literature available on NIS in the context of REDD+, the aim of this article is to identify the current needs facing non-Annex I Parties and to offer some suggestions as to how these needs may be met. An analysis of non-Annex I Parties reveals diversity among regions. In many aspects, parties from Latin America are generally better informed about and more engaged with the development of AFOLU GHG inventories, followed by the Asia-Pacific and Africa regions. Despite regional variations, the main common challenges are as follows: insufficient institutional arrangements, inadequate financing, limited technical capacity and a lack of available data. Our suggestions for meeting these needs and overcoming the challenges posed by the establishment of an NIS for GHG inventories are made based on the current practices of Annex I Parties.
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ABSTRACT With the growing interest in estimating carbon stocks in forests, available allometric equations have been compiled. These compilations often reveal contrasting models for the same species and site. Rather than choosing a model... more
ABSTRACT With the growing interest in estimating carbon stocks in forests, available allometric equations have been compiled. These compilations often reveal contrasting models for the same species and site. Rather than choosing a model with the risk of not selecting the best available one, Bayesian model averaging (BMA) offers a way to combine different allometric equations into a single predictive model. In the deterministic version of BMA, existing models with known coefficients are combined. In the statistical version, competing models are at the same time fitted and combined. Using the BMA of deterministic models, we combined three existing multispecies pan-tropical biomass equations for tropical moist forests. The resulting model brought a relatively minor although consistent improvement of the predictions of the aboveground dry biomass of trees. These three models were particular cases of a family of models that were subsequently combined using the BMA of statistical models. Again, the resulting model was able to capture features in the biomass response to diameter that no single model was able to fit. BMA thus is an alternative to model selection that allows integrating the biomass response from different models.
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ABSTRACTDeforestation and forest degradation represent an important part of global CO2 emissions. The identification of the multiple drivers of land-use change, past and present forest cover change and associated carbon budget, and the... more
ABSTRACTDeforestation and forest degradation represent an important part of global CO2 emissions. The identification of the multiple drivers of land-use change, past and present forest cover change and associated carbon budget, and the presence of locally adapted systems to allow for proper monitoring are particularly lacking in sub-Saharan Africa (SSA). Any incentive system to reduce emissions from deforestation and forest degradation (REDD+) will have to overcome those limits. This paper reviews the main challenges to implementing effective REDD+ mitigation activities in SSA. We estimate that SSA is currently a net carbon sink of approximately 319 TgCO2 yr−1. Forest degradation and deforestation put the forest carbon stock at risk (mean forest carbon stock is 57,679 TgC). Our results highlight the importance of looking beyond the forest sector to ensure that REDD+ efforts are aligned with agricultural and land-use policies.
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Research Interests: Earth Sciences, Carbon Sequestration, Biological Sciences, Environmental Sciences, Global Carbon Cycle, and 11 moreFossil Fuels, Tropical forest, Forest degradation, Biogeosciences, Carbon balance, Carbon Emissions, Data Model, Sub Saharan Africa, AGRICULTURAL SECTOR, Fire regime, and net ecosystem production
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... STOCK DE CARBONE ET PRODUCTIVITÉ / LE POINT SUR
Régis Peltier1 Clément Njiti Forkong2 Mama Ntoupka2 Raphaël Manlay3 Matieu Henry3 Vincent Morillon3 ... Régis Peltier, Clément Njiti Forkong, Mama Ntoupka, Raphaël Manlay, Matieu Henry,... more
... STOCK DE CARBONE ET PRODUCTIVITÉ / LE POINT SUR
Régis Peltier1 Clément Njiti Forkong2 Mama Ntoupka2 Raphaël Manlay3 Matieu Henry3 Vincent Morillon3 ... Régis Peltier, Clément Njiti Forkong, Mama Ntoupka, Raphaël Manlay, Matieu Henry, Vincent Morillon ...
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... 1 AgroParisTech-ENGREF, GEEFT, 648 rue Jean-François Breton, BP 7355 - 34086 Montpellier Cedex 4, France; Corresponding author: henry@unitus.it ... Experiments were conducted in a 120 ha forest compartment of Boi Tano forest reserve,... more
... 1 AgroParisTech-ENGREF, GEEFT, 648 rue Jean-François Breton, BP 7355 - 34086 Montpellier Cedex 4, France; Corresponding author: henry@unitus.it ... Experiments were conducted in a 120 ha forest compartment of Boi Tano forest reserve, a primary forest located in the wet ...