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In agroforestry systems, fine roots grow at several depths due to the mixture of trees and annual crops. The decomposition of fine roots contributes to soil organic carbon stocks and may impact soil fertility, particularly in poor soils, such as those encountered in sub-Sahelian regions. The aim of our study was to measure the decomposition rate of...
Eight years of studying coffee ecophysiology and monitoring ecosystem services (ES) in a large coffee farm in Costa Rica revealed several practical recommendations for farmers and policy makers. The cropping system studied within our collaborative observatory (Coffee-Flux) corresponds to a coffee-based agroforestry system (AFS) under the shade of l...
Les mesures d’échanges des principaux gaz à effet de serre (CO2, N2O et CH4) entre le sol et l’atmosphère sont des données importantes dans l’étude du fonctionnement des agrosystèmes. Ces données peuvent être mesurées à haute résolution temporelle grâce à des chambres de mesure automatiques qui constituent actuellement la technique de référence. Le...
Background & Aims Better understanding of belowground interactions in agroforestry systems is crucial for the success of plant co-existence. Beyond root competition, associated arbuscular mycorrhizal (AM) fungi can also be involved in plant to plant interactions. Thus far, the contribution of each agroforestry component (trees, herbaceous vegetatio...
The TTD10 method is an empirical evolution of the constant heat dissipation method of Granier (1985). By contrast to Granier, it uses a transient heating of 10 minutes, and it can be applied to a single-needle probe (Do et al., 2011). This system saves energy and cost and reduces thermal interference due to heat storage and passive thermal gradient...
Eight years of monitoring ecophysiology and ecosystem services (ES) in a large coffee farm of Costa Rica yields a range of practical applications for the farmer and stakeholders, thanks to numerous scientific actors and disciplines contributing to our collaborative observatory (Coffee-Flux). • A lot of ecosystem services depend on the soil properti...
Identify efficient strategies that foster long term soil carbon sequestration in agricultural systems - Quantify and model soil carbon sequestration dynamics and its determinants in different agricultural systems at crop-soil, farm and landscape scales - Deliberate amongst stakeholders about soil carbon sequestration pathways - Share knowledge, tools and experience on soil management options Questioned on the 4/1000 initiative on soil carbon (C) sequestration to face climate change (CC), several Labex Agro units and their partners propose to pull together their research capacities in order to provide new insights in soil C sequestration, the DSCATT project proposes to explore the potential for sequestering C in cultivated soils, taking into account the sustainability of agricultural practices in the context of global changes. DSCATT operates at 4 sites (in Senegal, Zimbabwe, Kenya, and France). The project addresses 3 interrelated scales of fields, farms or territories. At field level, research focuses on how biomass production and soil C sequestration relate, in different soil and climate conditions. Two approaches complement each other. One studies at the soil-plant interface the processes regulating the forms and residence time of C in soils. It includes the analysis of interactions between nutrients and C storage, the role of deep roots and in soils with contrasting storage potentials. The other approach determines the C balances under different practices. Farms will be characterized in order to propose practices likely to improve complementarities amongst the activities of rural households. At this scale, DSCATT research will focus on farmers' practices (for crops, livestock, forestry…) and assess the impacts of farmers' practices on their objectives (income, food security…), taking into account their main constraints (cash, labour…). The project will assess the social and economic determinants of farmers’ decisions and of trade-offs between farm activities. At the territory (or farmers' network) level, the different compartments of agroecosystems and the organic matter flows will be studied. The project will analyze the role of the socio-economic and biophysical contexts and will test several possible changes and their impacts on soil C sequestration dynamics, economic performance of farms and food security. This scientific knowledge and the viewpoints of the farmers involved will be shared and used for a transdisciplinary assessment of several C sequestration strategies in agricultural soils. Considering changes and uncertainties, a multi-criteria and prospective evaluation approach is proposed. It will allow iterations between evaluation and redefinition of strategies to cope with global changes in agriculture. The sharing and dissemination of the knowledge enriched by the project will target several audiences (farmers, students and teachers, policy makers) through a variety of communication media and assessment tools. DSCATT will link the knowledge on processes governing the preservation of C sequestration and farmers' multiple objectives and constraints. Project cofunded by Agropolis Fondation and Total Fondation (1.6 M€) (2019-2023) Project Leader: Dr Dominique Masse (IRD) https://dscatt.net/ @DSCATT_project #DSCATT