Jean-Daniel Bontemps

Institut national de l’information géographique et forestière | IGN · Laboratory of Forest Inventory (LIF)

The bundle of forest landowners’ rights largely varies from one jurisdiction to another. On a global scale, the diversity of forest management regime and property rights systems is such that finding comprehensive and standardised approaches for governance analysis purposes is a challenging task. This paper explores the use of the Property Rights In...

Aims Spatially balanced sampling is the most efficient method for surveying continuous and spatially structured populations. The spatial sampling of large‐scale surveys is mostly based on grids whose properties drive and potentially limit the possibility of building flexible samples. Periodicity causes high sampling constraints when an increase in...

The bundle of forest landowners’ rights largely varies from one jurisdiction to another. On a global scale, the diversity of forest regime and property rights systems is such that finding similarities for governance analysis purposes is a challenging task. This paper built on the Property Rights Index for Forestry (PRIF). We show that PRIF is a rel...

Key message Forest monitoring in Europe is turning matter of renewed political concern, and a possible role for ICP Forests health monitoring has been suggested to meet this goal (Ann For Sci 78:94, 2021). Multipurpose national forest inventory (NFI) surveys yet offer a sampling effort by two orders of magnitude greater than ICP level 1, have accom...

Key message Fifteen species are most susceptible to require vegetation control during tree regeneration in the range of our study. Among these 15 species, Rubus fruticosus , Pteridium aquilinum , and Molinia caerulea cover each more than 300,000 ha of open-canopy forests. Context Vegetation control, i.e., the reduction of competitive species cover...

We invent here in this manuscript new tree describing parameters which can be derived from a QSM. QSMs are topological ordered cylinder models of trees which describe the branching structure completely. All new invented parameters have in common, that their defining point of view looks from the direction of the tips and not from the root along the...

Models based on national forest inventory (NFI) data intend to project forests under management and policy scenarios. This study aimed at quantifying the influence of NFI sampling uncertainty on parameters and simulations of the demographic model MARGOT. Parameter variance–covariance structure was estimated from bootstrap sampling of NFI field plot...

Le temps forestier s’est singulièrement diversifié et enrichi au cours des dernières décennies, entrant en résonance avec le développement anthropique et la crise environnementale. La découverte de phénomènes de grande échelle opérant à des échelles extrêmes a ainsi consacré un temps profond et un temps réel des forêts. Cette nouvelle appréhension...

Spatially balanced sampling is the most efficient design for surveying continuous or spatial populations across space. The spatial sampling of large-scale surveys is mostly based on grids, whose properties drive, and potentially limit, the possibilities of building flexible samples. Conciliating spatial balance and flexibility remains difficult. In...

Le plan France Relance lancé en septembre 2020 prévoit des mesures forestières sur 2 ans, avec un accent sur la reconstitution des peuplements forestiers sinistrés, affaiblis par les sécheresses ou attaqués par les scolytes. Cependant la crise forestière liée au changement climatique est partie pour durer et les efforts sur les connaissances à acqu...

The current increase in European forest resources forms a singularity across the globe. Whether this trend will persist, and how biological and economic trends feature it form crucial issues to green economy challenges and C sequestration. The present screening of Forest Europe 2015 statistics explored the features, inertia and limits of this expan...

Forest growth changes have been a matter of intense research efforts since the 1980s. Owing to the variety of their environmental causes - mainly atmospheric CO2 increase, atmospheric N deposition, changes in temperature and water availability, and their interactions - their interpretation has remained challenging. Recent isolated researches sugges...

Located in the core zone of Mulun National Nature Reserve in northern Guangxi, the limestone cave Ganxiao Dong harbours the richest cave fauna currently known in China. In total, 26 species of cave invertebrates have been recognized so far, in spite of limited sampling efforts. Of them, 20 are troglobionts or stygobionts, including one snail, four...

National Forest Inventories (NFIs) perform systematic forest surveys across space and time. They are hence powerful tools to understand climate controls on forest growth at wide geographical scales and account for the effects of local abiotic and biotic interactions. To investigate the effects of climate change upon growth dynamics of four major Eu...

Stem biomass ratio (SBR, kg m⁻³) is a forest state variable that converts forest volume of growing stock into biomass. However, huge intraspecific variation in wood density (WD) driven by biotic and abiotic environments of tree growth remains ignored in C budgets. The aims of this study were (i) to identify variations in SBR along water, soil nutri...

Pure and even-aged (PEA) forests of fast growing conifer species have for long been key providers of industrial raw material. Despite recent concerns regarding their greater sensitivity to major natural disturbances, their impacts onto biodiversity and their funding efficiency, PEA conifer forests could remain a major economic target given the ongo...

• Key message A recent paper by Ceccherini et al.( 2020a ) reported an abrupt increase of 30% in the French harvested forest area in 2016–2018 compared to 2004–2015. A re-analysis of their data rather led us to conclude that, when accounting for the singular effect of storm Klaus, the rate of change in harvested area depended on the change year use...

The forest transition – or forest-area transition – has been put forward as a land-use concept by A.S. Mather in 1992 (The forest transition. Area 24, 367-379), to describe the historical trend generally observed in the forest area of developed countries, embodied in a V-shaped curve of the forest area over time, and that may serve as a paradigm to...

Objectives: Evaluate the capacity of temperate forest resources to both provide climate change mitigation and to sustain the downstream timber sector explicitly considering the cascade of biophysical and economic drivers (in particular, climate change impacts and subsequent adaptation actions) and their uncertainty. Methodology: A recursive bio-eco...

Key message French forests exhibit the fastest relative changes across Europe. Growing stock increases faster than area, and is greatest in low-stocked private broadleaved forests. Past areal increases and current GS levels show positive effects on GS expansion, with GS increases hence expected to persist. ContextStrong increases in growing stocks...

Key message Centenary forest statistics informing major attributes of French forests were digitized, checked for consistency, and used to infer forest dynamics. Comparison to forest inventory data highlights increases in forest area and tree diversity, and substantial maturation of forests. Dataset access at https://doi.org/10.5281/zenodo.3739458 C...

Les forêts de l’hémisphère nord sont plus productives qu’il y a plusieurs décennies. Telle est la tendance observée et quantifiée dans différentes études menées depuis les années 1970 et qui mettent en cause plusieurs facteurs : les modifications des régimes pluviothermiques, les dépôts azotés et l’augmentation de la concentration atmosphérique en...

Tree growing conditions are changing rapidly in the face of climate change. Capturing tree-growth response to such changes across environmental contexts and tree species calls for a continuous forest monitoring over space. Based on >10,000 tree-ring measurements sampled across the systematic grid of the continuous French national forest inventory (...

Recent growth anomalies patterns across coniferous forests of France and their relationships to climate.

Introduction: Biomass ratio is a state variable allowing the conversion of the forest growing stock into biomass (Kauppi et al., 2006). This variable is most often considered constant per tree species despite the huge range of intraspecific variability of basic density. Indeed, the factors that influence wood density are numerous: tree growth and a...

Celebration of the first 100 years of history of the NFI’s by bringing together researchers and practitioners with an interest in forest monitoring, to reflect on the passed challenges, the lessons learned, and to improve future large-scale forest and landscape inventory programs.

Forest tree species strongly influence forest dynamics and management. French forests have the greatest compositional diversity in Europe, which constrains the quantitative analysis of associated wood resources. A partition of French forests according to dominant tree species composition and stratified by biogeographical regions (GRECO) was develop...

Increases in tree mortality rates have been highlighted in different biomes over the past decades. However, disentangling the effects of climate change on the temporal increase in tree mortality from those of management and forest dynamics remains a challenge. Using a modelling approach taking tree and stand characteristics into account, we sought...

Supplementary data for article "Background mortality drivers of European tree species: climate change matters"

Context: Lowering stand density has been suggested to adapt forests to warmer and drier conditions. Whether common dendrometric rules used to guide growth models and support silviculture are still valid at these densities lower than usual needs be tested. This includes (1) estimating the stand growth-density relationship over wider density gradient...

Questo contributo esamina la capacità delle risorse forestali francesi, da un lato di porsi come opzione realistica di mitigazione dei cambiamenti climatici, e dall'altro di continuare a sostenere il settore dei prodotti legnosi a valle, nella consapevolezza che le risorse forestali sono esse stesse soggette agli effetti dei cambiamenti climatici....

Key message The diversity of forest management systems and the contrasted competition level treatments applied make the experimental networks of the GIS Coop, a nationwide testing program in the field of emerging forestry topics within the framework of the ongoing global changes. Context To understand the dynamics of forest management systems and...

The diversity of forest management systems and the contrasted competition level treatments applied make the experimental networks of the GIS Coop, a nationwide testing program in the field of emerging forestry topics within the framework of the ongoing global changes. To understand the dynamics of forest management systems and build adapted growth...

Past and present environmental changes cause significant changes in tree growth in many parts of the world, where both decreasing and increasing growth trends have been detected over the last decades. The Mediterranean basin is especially sensitive to climate change and subsequent tree growth declines. In this article, we present the first study on...

Le projet XyloDensMap Passer d’une évaluation en volume des ressources forestières (situation actuelle) à une évaluation en biomasse pour la comptabilité du carbone forestier et pour l’optimisation des usages en biomasse de la forêt, nécessite la connaissance de la masse volumique du bois de toutes les espèces de même que ses variations selon, les...

L’expansion en surface et en stock sur pied de la forêt française est étudiée à partir des données d’inventaire forestier national et de la statistique Daubrée (1908). Son hétérogénéité géographique, selon la propriété (privée, domaniale, autre forêt publique soumise), et la composition ligneuse (feuillus/résineux) a été examinée. Entre 1908 et 201...

Les effets de la densité du peuplement et de la sécheresse estivale ont été analysés sur la croissance en diamètre et en hauteur du Chêne sessile (Quercus petraea) à l’échelle du peuplement et de l’arbre. Les données des inventaires dendrométriques issues de deux réseaux d’expérimentations sylvicoles ont été utilisées (réseaux LERFOB et GIS Coop, 9...

Context. National forest inventories (NFI) have been little used to explore forest growth changes due to their limited temporal cover. Strong recent climatic warming renews their interest. The systematic and repeated cover of forest areas further enables explorations across a broad range of tree species and climatic gradients, and across spatial sc...

Forests cover approximately 30.8% (16.8 million ha in 2013) of the total land area of the French metropolitan territory. They show a high diversity resulting from environmental factors such as climate and habitats, tree species, stand structure and economic factors such as physical and environmental constraints on forest accessibility, ownership ca...

Key messageRecent growth changes (1980–2007) in Western European forests strongly vary across tree species, and range from +42% in mountain contexts to −17% in Mediterranean contexts. These changes reveal recent climate warming footprint and are structured by species' temperature (−) and precipitation (+) growing conditions. ContextUnprecedented cl...

Key message Tree resilience to drought was higher in drier sites and lower for suppressed trees grown in higher density stands, highlighting the role of acclimation and selection in tree responses to drought. Abstract Ongoing climate change will drive more frequent drought events in the future, with potential impacts on tree community structure an...

article présenté lors du Colloque CIAg "Une bioéconomie basée sur la forêt et le bois ?" organisé à Nancy le 8 décembre 2016.

Résumé Une bioéconomie fondée sur la forêt et le bois implique de concevoir de nouvelles stratégies de gestion pour simultanément adapter la forêt au changement climatique et lui permettre de répondre aux demandes accrues en visant l’optimisation d’un bilan carbone forêt-bois intégré. Par rapport aux inventaires forestiers tels qu’ils existent aujo...

Cette communication situe la recherche de nouveaux matériels forestiers de reproduction vis-à-vis de l’agenda climatique international et du développement de l’économie circulaire, en insistant notamment sur les limites de durabilité des filières énergies renouvelables concurrentes (dépendance aux matières premières). Elle décline ensuite les consé...

À destination des élus de communes forestières du Doubs (est de la France), cette communication vise à resituer la gestion de ces forêts vis-à-vis des grands enjeux internationaux et nationaux, faire un point actualisé sur l’état des connaissances (y compris en simulation prospective du comportement de différentes essences jusqu’en fin de siècle) e...

Editorial: “Forest inventories at the European level”

Key message This analysis of the tools and methods currently in use for reporting woody biomass availability in 21 European countries has shown that most countries use, or are developing, National Forest Inventory-oriented models whereas the others use standwise forest inventory--oriented methods. Context Knowledge of realistic and sustainable wood...

In the context of climatic change an increasing attention is paid to the ability of forests to store more carbon as increasing carbon sequestration by forests is equivalent to reducing emissions the release of carbon to the atmosphere. Estimating the quantity of carbon sequestered in the forests is usually based upon the National Forest Inventory...

Our aim was to investigate the possible enhancing role of long-term atmospheric CO2 increase on wood density as an essential component of biomass sequestration. We therefore assessed the long-term evolution of wood density over pre-industrial and contemporary periods, in a regional context free of management practices, atmospheric deposition and wi...

Annals of Forest Science is publishing a series of review papers to celebrate 50 years of activities as a journal in forest and wood science. The reviews emphasize the extent to which forest and wood sciences changed and developed as a large array of disciplines devoted to complex objects with sometimes many conflicting issues.

Even-aged forest stands are competitive communities where competition for light gives advantages to tall individuals, thereby inducing a race for height. These same individuals must however balance this competitive advantage with height-related mechanical and hydraulic risks. These phenomena may induce variations in height-diameter growth relations...

1.There is a rising interest in the role of species diversity in ecosystem functioning and services, including productivity. Yet, how the diversity-productivity relationship depends on species identity and abiotic conditions remains a challenging issue. 2.We analysed mixture effects on species productivity along site productivity gradients, calcul...

Annals of Forest Science changes its scope and complies with green open access rules

Nous avons modélisé sous SIG les différentes composantes nécessaires pour calculer le bilan en eau des sols, avec une résolution spatiale fine, inexistante auparavant. Ces données ont été validées, puis nous avons comparé différentes méthodes de calcul des bilans en eau et indices disponibles, mettant en évidence l'intérêt de l'utilisation de carte...

Annals of Forest Science is an international journal that publishes papers describing basic and applied research about forest science in the context of global change. The scope covers following aspects: (i) biology of trees and associated organisms (symbionts, pathogens, pests); (ii) forest dynamics and ecosystem processes under environmental or m...

Global and local environmental changes can cause significant changes in forest growth with important consequences for forest management. Although effects of climate change on tree growth are expected to be more pronounced near the edge of a geographic species range, significant changes in growth of common beech (Fagus sylvatica L.) over the last ce...

In the framework of sustainable forest management, measuring site quality and predicting site productivity remain a major forestry topic. Over the past years, it has been fostered by a number of site-growth modelling studies seeking to establish quantitative relationships between site index and explicit biophysical indicators. In addition, comparat...

Download full-text: http://documents.irevues.inist.fr/bitstream/handle/2042/56267/RFF_2014_SP_9_SAINT-ANDRE.pdf?sequence=1 Models used for decision-making in forestry policy, planning and management are not yet able to produce a simultaneous evaluation of the effect of global climate change and management on the various ecological and productive fu...

In the framework of sustainable forest management, measuring site quality and predicting site productivity remain a major forestry topic. Over the past years, it has been fostered by a number of site-growth modelling studies seeking to establish quantitative relationships between site index and explicit biophysical indicators. In addition, comparat...

Studying the effects of dendrometric and climatic variables on within-ring density variations needs flexible and interpretable models. We described the within ring density profile using a piecewise linear regression and studied its dependence on (1) dendrometric variables such as cambial age (CA) and ring width (RW), and (2) climatic variables. Bas...

Les outils de modélisation au service de la politique, de la planification et de la gestion forestière ne permettent pas encore une évaluation simultanée de l’impact des changements globaux et de la gestion sur les différentes fonctions écologiques et productives assurées par les écosystèmes forestiers. Nous proposons un état des lieux des modèles...

• Context While historical increases in forest growth have been largely documented, investigations on historical wood density changes remain anecdotic. They suggest possible density decreases in softwoods and ring-porous hardwoods, but are lacking for diffuse-porous hardwoods. • Aims To evaluate the historical change in mean ring density of common...

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Key message Productivity changes in Norway spruce show important regional and local spatial variations, highlighting their context dependence at different spatial scales. These variations suggest the enhancing role of climate warming, and interplay with local water and nutrient limitations. Abstract While forest growth changes have been observed...

Context . Forest resource projections are required as part of an appropriate framework for sustainable forest management. Suitable large-scale projection models are usually based on national forest inventory (NFI) data. However, sound projections are difficult to make for heterogeneous resources as they vary greatly with respect to the factors that...