Henri E. Cuny

Henri E. Cuny
Institut national de l’information géographique et forestière (IGN) · Ressources forestières et carbone

Doctor in Plant Biology and Forest Science

About

30
Publications
14,186
Reads
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1,660
Citations
Additional affiliations
January 2016 - present
Institut national de l’information géographique et forestière
Position
  • Engineer
September 2015 - August 2016
Swiss Federal Institute for Forest, Snow and Landscape Research WSL
Position
  • PostDoc Position
October 2014 - March 2015
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • PostDoc Position

Publications

Publications (30)
Article
Full-text available
We investigated whether timing and rate of growth are related to the life strategies and fitness of three conifer species. Intra-annual dynamics of wood formation, shoot elongation and needle phenology were monitored over 3 years in five Norway spruces (Picea abies (L.) Karst.), five Scots pines (Pinus sylvestris L.) and five silver firs (Abies alb...
Article
Full-text available
The intra-annual dynamics of wood formation, which involves the passage of newly produced cells through three successive differentiation phases (division, enlargement, and wall thickening) to reach the final functional mature state, has traditionally been described in conifers as three delayed bell-shaped curves followed by an S-shaped curve. Here...
Article
Full-text available
Conifer tree rings are generally composed of large, thin-walled cells of light earlywood followed by narrow, thick-walled cells of dense latewood. Yet, how wood formation processes and the associated kinetics create this typical pattern remains poorly understood. We monitored tree-ring formation weekly over 3 yr in 45 trees of three conifer species...
Article
Full-text available
Wood is the main terrestrial biotic reservoir for long-term carbon sequestration, and its formation in trees consumes around 15% of anthropogenic carbon dioxide emissions each year. However, the seasonal dynamics of woody biomass production cannot be quantified from eddy covariance or satellite observations. As such, our understanding of this key c...
Article
Full-text available
The complex inner mechanisms that create typical conifer tree-ring structure (i.e. the transition from large, thin-walled earlywood cells to narrow, thick-walled latewood cells) were recently unraveled. However, what physiological or environmental factors drive xylogenesis key processes remain unclear. Here, we aim to quantify the influence of seas...
Article
Key message We present a methodological framework that both scientists and supply chain actors can mobilise to organise information at different scales of observation, and further make informed decisions regarding the supply and extraction of bio-molecules from forest biomass. We demonstrate its usefulness for extracting bio-molecules contained in...
Article
Key message A set of models of bark thickness at breast height and bark volume are now available for six species in France. A common model suitable for predicting bark volume was proposed for all species. A small but significant altitude effect on bark thickness at breast height was detected for three species. Context The growing demand for wood en...
Article
In their Letter, Elmendorf and Ettinger (1) question the dominant role of photoperiod in driving secondary growth resumption (hereafter referred to as xylem formation onset) of the Northern Hemisphere conifers, recently reported by Huang et al. (2). Their opinions are grounded on the following three aspects, including 1) the seasonality of the phot...
Article
A valid representation of intra‐annual wood‐formation processes in global vegetation models is vital for assessing climate change impacts on the forest carbon stock. Yet, wood formation is generally modelled with photosynthesis, despite mounting evidence that cambial activity is rather directly constrained by limiting environmental factors. Here, w...
Article
Full-text available
Wood formation consumes around 15% of the anthropogenic CO 2 emissions per year and plays a critical role in long-term sequestration of carbon on Earth. However, the exogenous factors driving wood formation onset and the underlying cellular mechanisms are still poorly understood and quantified, and this hampers an effective assessment of terrestria...
Article
Key message This study presents a novel histologic approach to quantify the intra-annual dynamics of carbon sequestration in forming wood. This innovative approach, based on repeated measurements of xylem apparent density, is more direct, and more accurate than the previously published cellular-based approach. Moreover, this new approach, which was...
Article
The phenology of wood formation is a critical process to consider for predicting how trees from the temperate and boreal zones may react to climate change. Compared to leaf phenology, however, the determinism of wood phenology is still poorly known. Here, we compared for the first time three alternative ecophysiological model classes (threshold mod...
Article
Conifer trees possess a typical anatomical tree‐ring structure characterized by a transition from large and thin‐walled earlywood tracheids to narrow and thick‐walled latewood tracheids. However, little is known on how this characteristic structure is maintained across contrasting environmental conditions, due to its crucial role to ensure sap asce...
Presentation
Dated tree rings are used to understand tree-growth responses to climatic variability and reconstruct past climate conditions. In parallel, mechanistic models make use of experimentally derived plant-atmosphere interactions to simulate past and future environmental impact on forest productivity. Yet, substantial model inconsistencies and mismatches...
Article
Full-text available
In the last decade, the pervasive question of climate change impacts on forests has revived investigations on intra-annual dynamics of wood formation, involving disciplines such as plant ecology, tree physiology and dendrochronology. This resulted in the creation of many research groups working on this topic worldwide and a rapid increase in the nu...
Article
Mechanistic understanding of tree-ring formation and its modelling requires a cellular-based and spatially organized characterization of a tree ring, moving from whole rings, to intra-annual growth zones and individual cells. A tracheidogram is a radial profile of conifer anatomical features, such as lumen area and cell wall thickness, of sequentia...
Article
Interannual variability of wood density - an important plant functional trait and environmental proxy - in conifers is poorly understood. We therefore explored the anatomical basis of density. We hypothesized that earlywood density is determined by tracheid size and latewood density by wall dimensions, reflecting their different functional tasks. T...
Article
Full-text available
The interaction between xylem phenology and climate assesses forest growth and productivity and carbon storage across biomes under changing environmental conditions. We tested the hypothesis that patterns of wood formation are maintained unaltered despite the temperature changes across cold ecosystems. Wood microcores were collected weekly or biwee...
Article
Full-text available
Wood is of crucial importance for man and biosphere. In this mini review, we present the fundamental processes involved in tree-ring formation and intra-annual dynamics of cambial activity, along with the influences of the environmental factors. During wood formation, new xylem cells produced by the cambium are undergoing profound transformations,...
Article
Due to global warming, high-latitude ecosystems are expected to experience increases in temperature and drought events. Wood formation will have to adjust to these new climatic constraints to maintain tree mechanical stability and long-distance water transport. The aim of this study is to understand the dynamic processes involved in wood formation...
Article
Full-text available
Understanding how wood develops has become an important problematic of plant sciences. However, studying wood formation requires the acquisition of count data difficult to interpret. Here, the annual wood formation dynamics of a conifer tree species were modeled using generalized linear and additive models (GLM and GAM); GAM for location, scale and...
Article
Full-text available
Wood accounts for a major portion of land biomass and is an essential resource for man. The cells that make up wood are produced by the vascular cambium, a secondary meristem situated between the wood and bark. It is during the first fundamental process of xylogenesis cell division that the cambial cells produce what later become the xylem cells. T...
Article
Full-text available
Le bois est un composant important des écosystèmes et du cycle du carbone Avec une masse sèche globale estimée à près de 1 000 gigatonnes, le bois (xylème secondaire) est, de très loin, le composé biologique le plus abondant de la planète (Groombridge et Jenkins, 2002). La majorité du bois (80 %) se trouve dans les forêts qui couvrent le tiers des...
Article
Full-text available
Background and AimsOngoing global warming has been implicated in shifting phenological patterns such as the timing and duration of the growing season across a wide variety of ecosystems. Linear models are routinely used to extrapolate these observed shifts in phenology into the future and to estimate changes in associated ecosystem properties such...
Thesis
La formation du bois (xylogénèse) produit une large partie de la biomasse de la planète et une ressource essentielle pour l'Homme. Les cellules du bois sont produites par division dans le cambium puis s'élargissent, forment une paroi épaisse lignifiée et meurent. Pendant l'année, ces processus sont définis par des dates, durées et vitesses qui cara...
Article
Full-text available
This work deals with semiparametric kernel estimator of probability mass functions which are assumed to be modified Poisson distributions. This semiparametric approach is based on discrete associated kernel method appropriated for modelling count data; in particular, the famous discrete symmetric triangular kernels are used. Two data-driven bandwid...
Article
Studies of intra-annual dynamics of cambial activity and wood formation share very similar data because they are based on classic concepts of xylem development and well-documented techniques of sample preparation. However, the way the data are produced is specific to each study or group of authors because there is not a real agreement or consensus...

Projects

Project (1)
Project
At the beginning of this century, numerous pines in the Rhone Valley, one of the driest inner alpine valleys of the European Alps, situated between Brig and Sion (Canton Valais), started showing symptoms of drought; several older trees having already died. With a view to uncovering the causes of these pines dying, the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) launched a long-term irrigation experiment in summer 2003 in the Nature Park of Pfyn-Finges. Since then, the WSL has been comparing the growth of several hundred pines in irrigated forest plots with trees that only receive the natural amount of precipitation. More infos can be found at https://www.wsl.ch/en/about-wsl/instrumented-field-sites-and-laboratories/experimental-sites-in-forests/pfynwald.html