Julien Demenois

Julien Demenois
Cirad - La recherche agronomique pour le développement | CIRAD · Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)

PhD in functional ecology & agronomy /Tropical forester (Msc) / Agronomist (Msc)

About

84
Publications
27,548
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266
Citations
Citations since 2016
61 Research Items
225 Citations
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Introduction
Specialized in natural resources management with a focus on functional ecology in the tropics, I am currently the "4 per 1000 Initiative" (www.4p1000.org) correspondent and co-leader of the "Climate Change" Key Thematic Field at Cirad. My research is focussed on soil carbon sequestration and ecological restoration. Since September 2021, I am located in Costa Rica, seconded to CATIE.
Additional affiliations
September 2021 - present
CATIE - Centro Agronómico Tropical de Investigación y Enseñanza
Position
  • Senior Researcher
Description
  • Senior researcher on soil carbon sequestration in agriculture, forestry and livestocks in the "Accion Climatica Unidad"
October 2017 - present
Cirad - La recherche agronomique pour le développement
Position
  • Researcher
October 2014 - September 2017
AgroParisTech
Position
  • PhD Student
Description
  • Research on root traits, mycorrhiza and erosion in tropical soils. The overall aim of this research was to better understand the interactions between plants, fungi and soil to mitigate erosion.
Education
October 2014 - June 2017
AgroParisTech
Field of study
  • Functional ecology
September 1999 - November 2001
AgroParisTech
Field of study
  • Tropical Forestry - ENGREF
September 1997 - September 2000
AgroParisTech
Field of study
  • agronomy

Publications

Publications (84)
Preprint
Full-text available
Pre-print open for comments until July 4, here : https://egusphere.copernicus.org/preprints/2022/egusphere-2022-115/ Thank you for your comments ! Abstract : Identifying the drivers of soil organic carbon (SOC) stock changes is of utmost importance to contribute to global challenges like climate change, land degradation, biodiversity loss or food...
Article
Full-text available
For several years, soil has been at the heart of global issues, whether it be climate change, biodiversity loss or land desertification. Soil organic carbon plays a major role in these issues because of its contribution to several ecosystem services. This renewed interest increases the demand for dissemination of data on soils and encourages scient...
Article
Full-text available
Increasing soil organic carbon (SOC) in natural and cultivated ecosystems is proposed as a natural climate solution to limit global warming. SOC dynamics is driven by numerous factors such as land-use change, land management and climate change. The amount of additional carbon potentially stored in the soil is the subject of much debate in the scien...
Article
Full-text available
We have read with interest an opinion paper recently published in the European Journal of Soil Science (Berthelin et al., 2022). This paper presents some interesting considerations, at least one of which is already well known to soil scientists working on soil organic carbon (SOC), i.e. a large portion (80-90%) of fresh carbon inputs to soil is sub...
Conference Paper
Full-text available
Reaching net zero CO2 (balance of residual emissions and sinks) by 2050 is needed to maintain the global mean temperature on Earth below 1.5°C in 2100. This central message of the 1.5°C special report by IPCC (2018) has led to multiple carbon neutrality commitments by countries, private sector and local authorities. The race to net zero CO2 is a fu...
Data
DATA4C+ is a thesaurus classifying and defining land management practices in agriculture and forestry for soil carbon storage. DATA4C+ thesaurus is focussed on land management practices identified in the scientific literature as drivers of soil organic carbon (SOC) changes. DATA4C+ thesaurus aim was to fill the gap of lack of a comprehensive thesau...
Article
Full-text available
Major drivers of gains or losses in soil organic carbon (SOC) include land management, land-use change, and climate change. Thousands of original studies have focused on these drivers of SOC change and are now compiled in a growing number of meta-analyses. To critically assess the research efforts in this domain, we retrieved and characterized 192...
Article
Full-text available
Maintaining and enhancing soil organic carbon (SOC) stocks are options to tackle climate change and food security. However, the large-scale implementation of SOC sequestration in contrasted social and economic environments is a challenge. Giving economic value to SOC is seen as an efficient incentive for farmers to enhance SOC sequestration. There...
Presentation
Full-text available
Because of its multiple co-benefits, soil organic carbon is at the crossroads of several Sustainable Development Goals, but also of the United Nations Conventions on Climate, Biodiversity and Desertification. Launched during COP 25 in Paris, the 4 for 1000 Initiative is one of the major initiatives of this international agenda that involves multi-s...
Article
Full-text available
This dataset is composed of qualitative data related to soil carbon sequestration schemes in agriculture and forestry. These data were produced between June and August 2020.during the internship of Alexia Dayet (SupAgro) under the supervision of Julien Demenois (Cirad) The dataset is accessible here on Common Creative CC-BY licence : https://datav...
Presentation
Full-text available
The presentation was done during the webinar "Preventing and mitigating land degradation: nutrient turnover and terrestrial carbon sequestration" organized by FAO, Agreenium and EN-ESCAP on October 28, 2020 The webinar can be seen here from 26'15"" to 53'00" : https://youtu.be/ONlhdFq_mD4
Chapter
Full-text available
Food security and water security in the Mediterranean are intrinsically linked and are facing similar challenges. Food security is threatened mainly by the high dependency of Mediterranean countries on food imports, making them vulnerable to external pressures such as volatile food prices. From a nutritional standpoint, the number of overweight and...
Article
Full-text available
The Paris Climate Agreements and Sustainable Development Goals, signed by 197 countries, present agendas and address key issues for implementing multi-scale responses for sustainable development under climate change—an effort that must involve local, regional, national, and supra-national stakeholders. In that regard, Continental Carbon Sequestrati...
Data
This dataset is composed of qualitative data related to barriers and actions to boost soil carbon sequestration in France and Senegal. These data were produced in 2018. The dataset is related to : Demenois, J., E. Torquebiau, et al. (2020). "Barriers and Strategies to Boost Soil Carbon Sequestration in Agriculture." Frontiers in Sustainable Food...
Article
Full-text available
The Paris Agreement calls for limiting global warming below 2°C. The “4 per 1000 Initiative: Soils for food security and climate” was launched in 2015 to increase soil organic carbon sequestration with three objectives: mitigation of climate change, adaptation to climate change and improved food security. One of the challenges of the Initiative rel...
Article
Full-text available
Aims Understanding how soil aggregate stability (MWD) is influenced by microbial diversity and abundance can be crucial for ecological restoration in severely disturbed areas. We investigated the relationships between plant and soil microbial diversity and MWD of an ultramafic Ferralsol along a vegetational succession gradient in New Caledonia, whe...
Poster
Full-text available
DATA4C+ (2019-2021) is a research project funded by the French Research National Agency (ANR), coordinated by Cirad and implemented by the consortium Cirad-INRA-IRD. DATA4C+ aims meeting the growing need to assess the impact of agricultural practices on soil carbon. Stakes are high to reference data and meta-data in databases to have a global view....
Chapter
Full-text available
Support de la vie terrestre, les sols sont largement ignorés par nos sociétés contemporaines et s'en trouvent aujourd'hui menacés. https://www.reseau-canope.fr/notice/tdc-n-1124-1er-novembre-2019.html
Chapter
Full-text available
Food systems are responsible for up to one-third of anthropogenic greenhouse gas (GHG) emissions. These emissions include carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) and are therefore a major driver of climate change. The environmental pressures on food systems are likely to intensify, as humanity is arguably already operating beyon...
Technical Report
Full-text available
A summary presenting the challenges for soil carbon sequestration research, hypothesis to be further tested and key research (and innovation) products.
Poster
Full-text available
The Paris agreement calls for limiting global warming well below 2°C. In this context, the “4 per 1000 Initiative: Soils for Food Security and Climate” was launched with a threefold objective: to contribute to the mitigation of and to the adaptation to climate change and to improve food security through soil organic carbon sequestration. One of the...
Technical Report
Full-text available
Cette stratégie de restauration écologique pour le grand Sud exposée dans le présent document s’articule autour de sept chapitres : - Le premier présente le contexte du développement d’une stratégie provinciale en matière de restauration des sites dégradés, - Le second clarifie les objectifs de la stratégie pour le grand Sud, - Le troisième dresse...
Article
Full-text available
Le changement climatique est une grave menace, notamment pour l’agriculture, secteur sensible aux enjeux aussi vitaux que la sécurité alimentaire. Sans en mésestimer les effets dramatiques, surtout pour les populations des pays du sud, ne serait-il pas aussi une opportunité à saisir ? Comment réconcilier les objectifs d’augmentation de la productio...
Conference Paper
Full-text available
New Caledonia, an archipelago located in the South West Pacific, is renowned for its exceptional flora and considered one of the world's most important biodiversity hotspot. The flora of New Caledonia is characterized by the occurrence of ultramafic outcrops that disproportionally contributes to the high levels of plant diversity and endemism. Howe...
Chapter
Full-text available
Food security, jobs, ecological transition in terms of production and consumption methods, etc, etc... agro-ecology is one way of addressing the expected challenges for humanity, and particularly farming systems in the global South. What will govern the success of the agro-ecological transition? Based on ten years' experience in the field, 130 scie...
Poster
Full-text available
The adoption rate of new practices contributing to the 4 per 1000 objectives and their duration of implementation are critical for its impacts at global scale. We organized participatory multi-stakeholders workshops to contribute to a better understanding of what could be an enabling environment in the context of the 4 per 1000 Initiative. To addre...
Presentation
Full-text available
4 per 1000 practices, innovation in agriculture, scaling up
Poster
Full-text available
There are huge needs and challenges in analyzing existing data on soil carbon sequestration to address the objectives of the 4 per 1000 Initiative. To tackle these challenges, the database DATA4C is currently under development with data from Cirad with a two-fold objective: centralizing existing data from Cirad on soil organic carbon (SOC) and gath...
Conference Paper
Full-text available
In Africa, climate change will result in disruptions in temperature, atmospheric CO2 content and rainfall, with impacts on cotton cultivation, particularly in terms of yield, precocity and resistance to pests and diseases. To adapt to these disruptions and mitigate their negative impacts, the implementation of modified or innovative sustainable cot...
Chapter
Full-text available
CHAPTER 5 A CIRCULAR APPROACH TO AGRICULTURE, LAND USE AND THE BIOECONOMY: AN OPPORTUNITY TO RESTORE SOIL FERTILITY AND DECARBONISE THE ECONOMY ................................................................... 1 Introduction............................................................................................ 2 Decarbonising European agri...
Conference Paper
Full-text available
Les chercheurs de l'Initiative "4 pour 1000" réunis à Sète les 7 et 8 novembre 2018 lors de l’atelier "La recherche française autour du programme international de recherche de l’initiative 4 pour 1000 : les sols pour la sécurité alimentaire et le climat" ont lancé un appel pour un "programme scientifique ambitieux" pour la mise en œuvre du volet re...
Presentation
Full-text available
The 4‰ Initiative launched by the French government at COP21 in Paris in December 2015 aspires to increase global soil organic carbon (SOC) stocks at a rate of 0.4% per year. We conducted a systematic literature review on SOC storage under agroforestry and conservation agriculture systems in sub-Saharan Africa, where we reported 66 and 33 cases for...
Research
Full-text available
Find here the main outputs from th workshop organized in Montpellier in April 2018.
Article
Full-text available
The article can be read here : http://rdcu.be/EqJz Aims Determining which abiotic and biotic factors influence soil aggregate stability (MWD) in tropical climates is often confounded by soil type. We aimed to better understand the influence of soil physical and chemical components, vegetation and fungal abundance on MWD of a Ferralsol along a succ...
Article
Soil aggregate stability is viewed as a promising indicator of the restoration status in eroded ecosystems, where the change in plant community composition through successional dynamics is a key driver of ecosystem restoration. In many tropical regions, ecological restoration is an important issue, but the relationship between different types of pl...
Presentation
Full-text available
This presentation was done during the Workshop ”Which major marine and coastal issues in the Mediterranean region ? Data and trends” organized to prepare a new report on the state and trends of the environment in the Mediterranean basin. A focus is done on the 4 per 1000 Initiative in the Mediterranean basin, the state of soil organic carbon in thi...
Conference Paper
Full-text available
A travers l'exemple de l'Initiative 4 pour 1000 : les sols pour la sécurité alimentaire et le climat, cette présentation vise à montrer comment l'expertise scientifique peut être mobilisée au service de l'action publique et contribuer à répondre aux Objectifs de Développement Durable des Nations Unies.
Article
Full-text available
In many tropical regions, such as New Caledonia, soil erosion from anthropogenic activities and subsequent ecological restoration are major issues that require detailed soil and vegetation data for the production of management plans. To determine if some plant species are more useful for stabilizing soil aggregates and thus reducing erodibility, we...
Article
In many tropical regions, such as New Caledonia, soil erosion from anthropogenic activities and subsequent ecological restoration are major issues. Revegetation would be an efficient way to mitigate soil degradation. Some plant and mycorrhizal species are more useful than others for stabilizing soil aggregates and thus reducing erodibility. However...
Presentation
Full-text available
Tropical forests cover almost half of the world’s forested area and are subject to deforestation and degradation. Their restoration appears to be a fundamental issue for human well-being. New Caledonia is no exception to this trend and is one of the hotspots of global biodiversity. Therefore, the objective of this thesis is to contribute to the eco...
Thesis
Full-text available
Tropical forest ecosystems cover nearly half of the world's forest area. These ecosystems provide basic services for the well-being of our societies (e.g. regulation of material flows, soil preservation) are particularly affected (loss and degradation of forests) by global changes. New Caledonia, and its ultramafic substrates, is no exception to th...
Thesis
Full-text available
Les écosystèmes forestiers tropicaux représentent près de la moitié de la superficie forestière mondiale. Ces écosystèmes qui fournissent des services fondamentaux pour le bienêtre de nos sociétés (e.g. régulation des flux de matières, maintien des sols) sont particulièrement touchés (perte et dégradation des forêts) par les changements globaux. La...
Article
Full-text available
Mechanisms leading to monodominance in rain forests are still commonly discussed within the framework of forest succession. Here, we focused on the comparison of two monodominant species, Arillastrum gummiferum (Myrtaceae) and Nothofagus aequilateralis (Nothofagaceae), to try to better understand the underlying ecological mechanisms. Those two spec...
Poster
Full-text available
La restauration écologique des écosystèmes forestiers tropicaux est un enjeu majeur pour le maintien des services écosystémiques. En Nouvelle-Calédonie, un point chaud de la biodiversité mondiale, l’érosion des sols découle de la dégradation des formations végétales du fait de l’activité minière intense (nickel) et des feux. L’objectif de notre tra...
Poster
Full-text available
La restauration écologique des écosystèmes forestiers tropicaux est un enjeu majeur pour le maintien des services écosystémiques. En Nouvelle-Calédonie, un point chaud de la biodiversité mondiale, l’érosion des sols découle de la dégradation des formations végétales du fait de l’activité minière intense (nickel) et des feux. L’objectif de notre tra...
Poster
Full-text available
La restauration écologique des écosystèmes forestiers tropicaux est un enjeu majeur pour le maintien des services écosystémiques. En Nouvelle-Calédonie, un point chaud de la biodiversité mondiale, l’érosion des sols découle de la dégradation des formations végétales du fait de l’activité minière intense (nickel) et des feux. L’objectif de notre tra...
Poster
Full-text available
New Caledonia is an archipelago located in the South West Pacific. With a mean annual rainfall above 2 000 mm in the South of the main island, frequent storms and steep slopes, combined with deforestation, fires and mining activity, water erosion on ultramafic soils is very frequent. Soil microorganisms increase soil aggregation and hence decrease...
Conference Paper
Full-text available
The objective of our study is to assess the erodibility of ferralitic ferritic soils on ultramafic substrate in different plant communities and to untangle the effect of abiotic and biotic factors...
Chapter
Full-text available
Caractériser la surface terrestre est important pour analyser la diversité des paysages et pour appréhender les changements d'utilisation du sol. En général, dans les cartographies de végétation de l'Amazonie et du plateau des Guyanes, la forêt est représentée sous la forme d'une grande couche verte homogène (TREES web page; Eva et al., 2004). Les...
Article
Full-text available
Filière et développement du teck en Inde du Sud : quel avenir pour les plantations privées ? Alors que l'Inde est actuellement le principal importateur de teck en Asie et que la demande ne cesse de croître, les plantations privées, notamment la foresterie paysanne, dont la dynamique est incontestable, sauront-elles répondre aux besoins du marché in...
Article
Full-text available
Apres avoir rappele brievement l'historique et les evolutions de la demarche d'amenagement forestier en Guyane, les auteurs deroulent le fil de la methodologie actuelle. Depuis le choix de la zone de foret a amenager jusqu'a l'exploitation forestiere et la mise en protection au titre de la biodiversite, chacune de ces etapes est presentee et mise e...
Article
Full-text available
After an introductory section on the background to the forest planning approach in French Guiana and how it has developed, the authors explain the rationale of the methodology currently implemented. The various stages, from the choice of the area of forest placed under a plan to logging and forest conservation for biodiversity, are described togeth...
Article
Full-text available
The aim of this article is to show how approaches have evolved since the first silvicultural experimentations in tropical rainforests. The dynamics of the forest is now better understood, as well as its reaction to logging and thinning. The stimulating effect of those operations on forest dynamics and the recovery of the timber stock have been demo...