Ecosystèmes Tropicaux
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Seminar: People first in Tropical Forests?, are we on the right track?

Seminar: People first in Tropical Forests?, are we on the right track? | Ecosystèmes Tropicaux | Scoop.it
Not taking seriously local people’s realities, needs and interests and the complexities of rural life is a risk of failure. The seminar “People first in Tropical Forests?, are we on the right track?
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Ecosystèmes Tropicaux
Veille sur les écosystèmes tropicaux. Réalisée par Agroparistech - centre de Montpellier - A. Filatre
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La stratégie nationale de mobilisation de la biomasse en consultation  – Énergie – Environnement-magazine.fr

La stratégie nationale de mobilisation de la biomasse en consultation  – Énergie – Environnement-magazine.fr | Ecosystèmes Tropicaux | Scoop.it
Mise en consultation sur le site du ministère de l'Environnement, la stratégie nationale de mobilisation de la biomasse définit un cadre global pour l’action publique qui guidera les mesures plus …
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Protection du massif forestier de Ngoyla au Sud-est Cameroun : l'appui de la Banque mondiale - Médiaterre

Protection du massif forestier de Ngoyla au Sud-est Cameroun : l'appui de la Banque mondiale - Médiaterre | Ecosystèmes Tropicaux | Scoop.it
L'actualité du développement durable avec Médiaterre, le système d'information mondial francophone pour le développement durable concourt à la mise en oeuvre du développement durable dans l'espace francophone par la diffusion et l'échange d'informations, et l'aide à la constitution de réseaux de coopération.
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Relationships between climate at origin and seedling traits in eight Panafrican provenances of Vitellaria paradoxa C.F. Gaertn. under imposed drought stress | World Agroforestry Centre

The morphological responses of seedlings of eight African provenances of Vitellaria paradoxa (Shea tree or Karité) to imposed draught stress were compared under nursery experimental conditions. The potted seedlings were subjected to three different watering regimes (87 days after sowing): no water stress (100% of the field capacity, C), moderate water stress (75% of C) and severe water stress (50% of C).
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Evaluating regression-kriging for mid-infrared spectroscopy prediction of soil properties in western Kenya

Publication date: September 2017
Source:Geoderma Regional, Volume 10
Author(s): Andrew Sila, Ganesh Pokhariyal, Keith Shepherd
In this study, the utility of regression-kriging was investigated in building prediction models for soil properties using mid-infrared (7498 to 600cm−1) spectral data for soil samples collected from Nyando, Nzoia and Yala catchment areas in Kenya, sampled at 0–20cm and 20–50cm depths. Using a systematic technique, 158 samples were selected for analysis of a number of soil properties of interest using wet chemistry methods. We randomly divided the dataset into two groups: 118 samples in the calibration and 40 samples in the holdout validation set. The calibration set was first used to develop partial least squares regression (PLS) models for all the soil properties. Residuals from these models were used to generate semivariograms, which revealed a strong spatial dependence as determined by the ratio of nugget to sill for nitrogen, 9%; Al, 12%; and B, 36%, but with weak spatial dependence for exchangeable Ca (ExCa), 100%; and carbon, 76%. The fitted theoretical semivariograms were used to fit regression-kriging models. Lastly, both the PLS and regression-kriging models were assessed with the validation set and their prediction performance evaluated by R2 and root mean square error (RMSE). The results showed that regression kriging method gave lower RMSE values for all the evaluated soil properties except for ExCa, B and exchangeable acidity, with the best predictions, compared with the PLS model, obtained for ExMg (R2, 0.93 vs 0.88; RMSE, 6.1 vs 8.4cmolc kg−1) and total nitrogen (R2 =0.92 vs R2 =0.74; RMSE, 0.11%, RMSE=0.2%). In this study, regression-kriging, which takes into account spatial variation normally ignored by other methods, improved use of infrared spectroscopy for predicting soil properties.
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La lutte contre l'exportation illégale du bois en direction de la Chine en débat à Douala - Médiaterre

La lutte contre l'exportation illégale du bois en direction de la Chine en débat à Douala - Médiaterre | Ecosystèmes Tropicaux | Scoop.it
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Getting down and dirty in degraded lands - Forests, Trees and Agroforestry

Getting down and dirty in degraded lands - Forests, Trees and Agroforestry | Ecosystèmes Tropicaux | Scoop.it
By Deanna Ramsay, originally published at CIFOR’s Forests News Tropical peatlands are massive carbon sinks. But what happens when they are depleted of the water that sustains them, or subject to other land-use changes? After fires raged in 2015 over Sumatra and Kalimantan in Indonesia, in part due to the widespread draining of peatlands, these wetland ecosystems and their environmental …
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Profiting from well-chosen tree species: improving the productivity of farming systems in Northwestern Vietnam - Forests, Trees and Agroforestry

Profiting from well-chosen tree species: improving the productivity of farming systems in Northwestern Vietnam - Forests, Trees and Agroforestry | Ecosystèmes Tropicaux | Scoop.it
By Ivanna Patton, La Nguyen and Ake E Mamo, originally published at ICRAF’s Agroforestry World Blog Northwestern Vietnam is home to the three poorest provinces of the country, with a combined population of 3.4 million people and poverty ranging from 32% to 48% of households  across provinces.  There is a culturally diverse mix of communities comprising 30 ethnic groups but …
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Influence of the structural framework on peat bog distribution in the tropical highlands of Minas Gerais, Brazil

Publication date: September 2017
Source:CATENA, Volume 156
Author(s): José Ricardo da Rocha Campos, Alexandre Christófaro Silva, Marcos Rafael Nanni, Marcilene dos Santos, Pablo Vidal-Torrado
Peat bogs are ecosystems characterized by high levels of organic matter (OM), which accumulates in environments of low biological activity. The peat bogs present in the tropical highlands of Serra do Espinhaço Meridional (SdEM), Brazil, are associated with hydromorphic environments formed under specific conditions and the strong influence of the quartzite basement, whereby a complex pattern of faults, fractures and folds has deeply affected the drainage network and geomorphological framework. This study investigated the influence of the structural framework on the distribution and morphology of these ecosystems within a hydrological and geomorphological context. The physical features of the landscape were analyzed using geological maps, a digital elevation model and by mapping the main geomorphological feature patterns obtained from geographic information systems (GIS). Ground Penetrating Radar transects were taken in representative areas, as the best strategy for detection of buried peat bogs, as well as to analyze bedrock configuration and infer its relationship with water flow. Four peat bog typologies were identified: “entrenched bogs”, “subsurface bogs”, “structural bogs”, and “hanging bogs”. The distribution and morphology of these typologies display a strong relationship either with alluvial sediments and floodplains or with structural/lithological features which caused water retention.
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2017-La démarche évaluative de la politique agro-écologique : premiers outils et perspectives

Portail de veille thématique pour les sciences sociales en Agriculture, Alimentation, Espace et Environnement
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Soil management and land restoration vital to meeting climate change and sustainable development targets - Forests, Trees and Agroforestry

Soil management and land restoration vital to meeting climate change and sustainable development targets - Forests, Trees and Agroforestry | Ecosystèmes Tropicaux | Scoop.it
By Susan Onyango, originally published at ICRAF’s Agroforestry World Blog Land degradation impacts the health and livelihoods of about 1.5 billion people worldwide. Further, the annual costs associated with land degradation worldwide is estimated to be US$ 231 billion as measured in terms of loss productivity and the costs to due to loss of ecosystems services. Given that the state …
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Breedcafs, un projet de recherche européen pour adapter les variétés de café à l’agroforesterie - CIRAD

Breedcafs, un projet de recherche européen pour adapter les variétés de café à l’agroforesterie - CIRAD | Ecosystèmes Tropicaux | Scoop.it
Breedcafs, un projet de recherche européen pour adapter les variétés de café à l’agroforesterie : L’agroforesterie est une voie d’adaptation de la production caféière au changement climatique, mais peu de variétés lui sont adaptées. Breedcafs, nouveau projet porté par le Cirad et financ
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2017 - Apport de l’innovation et de l’évaluation scientifique et technologique à la mise en œuvre des décisions de la COP21 Compte rendu de l’audition publique du 24 novembre 2016 et de la présenta...

Portail de veille thématique pour les sciences sociales en Agriculture, Alimentation, Espace et Environnement
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Assessing stock and thresholds detection of soil organic carbon and nitrogen along an altitude gradient in an east Africa mountain ecosystem

Publication date: September 2017
Source:Geoderma Regional, Volume 10
Author(s): C.M. Njeru, S. Ekesi, S.A. Mohamed, J.I. Kinyamario, S. Kiboi, E.E. Maeda
It is well established altitude driven agro-ecological factors play a key role to influence soil organic carbon (SOC) and total nitrogen (TN) stocks in tropical mountain ecosystems. Land cover transformation is chiefly responsible for soil nutrient stock changes, with the magnitude of stock changes being a crucial concern for most of east African mountain ecosystems. With biophysical heterogeneity defined by localized micro-climates, spatial soil nutrient stocks patterns and their detection thresholds remain poorly understood. This study describes SOC and TN stocks within a research transect in the Taita hills, Southeast Kenya, using three forms of stratification: altitude, soil types and land cover categories. Results show a linear and positive relationship between altitude and either carbon (R2 =0.30; P-value<0.05) or nitrogen (R2 =0.35; P-value<0.05) stocks, but varied within land cover and altitude gradations. Cambisols had 30% higher average SOC stock relative to Ferrasols and contained about half the stock observed for forest dominated Umbrisols. Average total nitrogen stocks in Cambisols and Ferrasols were comparable (0.4kgm2) in contrast to Umbrisols (0.9kgm2). Altitude and soil temperature explained 63% soil C and 62% total soil in Ferrasols. Altitude, soil temperature and water filled pore space explained >80% SOC and TN variation in Umbrisols. The absolute minimum detectable difference for carbon and nitrogen stocks varied at the low and high altitude categories of the study transect. Biophysical soils, land cover and altitude delineations play a crucial role to determine spatial soil nutrient patterns in east African mountain ecosystems and should be considered in the design of sustainable nutrient management practices.
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Le moratoire sur l'utilisation des forêts se poursuit en Indonésie

Le moratoire sur l'utilisation des forêts se poursuit en Indonésie | Ecosystèmes Tropicaux | Scoop.it
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IUFRO: Publications

IUFRO: Publications | Ecosystèmes Tropicaux | Scoop.it
Just published: Concise version of IUFRO Annual Report 2016 with President’s summary and outlook by Vice-Presidents now available! Full version under way!
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SoilPlusVeg: An integrated air-plant-litter-soil model to predict organic chemical fate and recycling in forests

SoilPlusVeg: An integrated air-plant-litter-soil model to predict organic chemical fate and recycling in forests | Ecosystèmes Tropicaux | Scoop.it
Publication date: 1 October 2017
Source:Science of The Total Environment, Volume 595
Author(s): Elisa Terzaghi, Melissa Morselli, Matteo Semplice, Bruno Enrico Leone Cerabolini, Kevin C. Jones, Michele Freppaz, Antonio Di Guardo
Current modelling approaches often ignore the dynamics of organic chemicals uptake/release in forest compartments under changing environmental conditions and may fail in accurately predict exposure to chemicals for humans and ecosystems. In order to investigate the influence of such dynamics on predicted concentrations in forest compartments, as well as, on air-leaf-litter fluxes, the SoilPlusVeg model was developed including a forest compartment (root, stem, leaves) in an existing air-litter-soil model. The accuracy of the model was tested simulating leaf concentrations in broadleaf woods located in Northern Italy and resulted in satisfying model performance. Illustrative simulations highlighted the “dual behaviour” of both leaf and litter compartments. Leaves appeared to behave as “filters” of air contaminants but also as “dispensers”, being deposition flux exceeded by volatilization flux in some periods of the day. Similarly, litter seemed to behave as a dynamic compartment which could accumulate and then release contaminants recharging air and vegetation. In just 85days, litter could lose due to volatilization, diffusion to depth and infiltration processes, from 6% to 90% of chemical amount accumulated over 1year of exposure, depending on compound physical and chemical properties. SoilPlusVeg thus revealed to be a powerful tool to understand and estimate chemical fate and recycling in forested systems.
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Project in Indonesia illustrates how tree genetic resources can positively affect livelihoods | World Agroforestry Centre

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To control or not to control: how do we lern more about how agronomic innovations perform on farms? | World Agroforestry Centre

Our paper ‘Loading the dice in favour of the farmer: reducing the risk of adopting agronomic innovations’ revealed mean increases but also large variation in the impact of four agroforestry practises on maize yield, as experienced by farmers in Malawi. This prompted a response from Sileshi and Akinnifesi that was critical of the data and methods used. Their main concern was that farmers did not necessarily manage crops identically in plots with and those without trees, so the yield differences that we measured may be partly caused by these differences in crop management.
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Quatrième congrès mondial d’agroforesterie : renforcer les relations entre science, société et politiques publiques - CIRAD

Quatrième congrès mondial d’agroforesterie : renforcer les relations entre science, société et politiques publiques - CIRAD | Ecosystèmes Tropicaux | Scoop.it
Quatrième congrès mondial d’agroforesterie : renforcer les relations entre science, société et politiques publiques : Montpellier accueillera du 20 au 25 mai 2019 le 4e Congrès mondial d’agroforesterie. L’organisation de ce congrès, qui a lieu tous les cinq ans et pour la première fois en Europe, est porté
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Le Parlement européen adopte une résolution sur l’huile de palme et la déforestation des forêts tropicales humides – Droit – Environnement-magazine.fr

Le Parlement européen adopte une résolution sur l’huile de palme et la déforestation des forêts tropicales humides – Droit – Environnement-magazine.fr | Ecosystèmes Tropicaux | Scoop.it
Le Parlement européen a adopté, mardi 4 avril 2017, une résolution sur l’huile de palme et la déforestation des forêts tropicales humides. Les députés européens dénoncent les conséquences …
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2016 - Evaluation Fançaise des Ecosystèmes et des Services Ecosystémiques (EFESE) :rapport intermédiaire

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Réduction de la déforestation à l'Ouest du Cameroun : rapport d'étude de faisabilité du projet pilote REDD - Médiaterre

Réduction de la déforestation à l'Ouest du Cameroun : rapport d'étude de faisabilité du projet pilote REDD - Médiaterre | Ecosystèmes Tropicaux | Scoop.it
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IUFRO: Publications

Publication of a new sourcebook in response to the need for better information on how remote sensing data can support biodiversity monitoring in tropical forests.
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2017 - Climate and conflict: reviewing the statistical evidence - a summary for policy-makers

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