Publications de Charlotte Grossiord

Impact of emerging compound droughts on forests: A water supply and demand perspective

The intensification of climate change-induced drought results in unprecedented tree and forest die-offs worldwide, increasingly driven by compound droughts. In this review, we examine the impacts of emerging compound droughts, which involve co-occurring st ...

2025

High transpirational cooling by urban trees despite extreme summer heatwaves

Charlotte Grossiord, Christoph Bachofen

Urban trees cool their environment by shading and transpiration (latent heat, LE), thereby alleviating urban heat. LE may be critically reduced during heatwaves, when trees reduce stomatal conductance (gS) to prevent hydraulic dysfunctions. Recent observat ...

2025

Charlotte Grossiord

WILEY2025

Growth Onset Rather Than Photosynthesis Strongly Regulates Autumn Senescence Termination Besides Climate Change

Charlotte Grossiord

AimPlant senescence largely influences the global carbon cycle by regulating the growing season length. However, the driving mechanisms of plant senescence remain unclear, particularly the role of developmental factors. This study aims to investigate how e ...

Wiley2025

Prolonged warming and drought reduce canopy‐level net carbon uptake in beech and oak saplings despite photosynthetic and respiratory acclimation

Laura Mekarni, Charlotte Grossiord, Eugénie Isabelle Mas, Christoph Bachofen, Margaux Clara Lou Didion-Gency, Janisse Deluigi

Tree net carbon (C) uptake may decrease under global warming, as higher temperatures constrain photosynthesis while simultaneously increasing respiration. Thermal acclimation might mitigate this negative effect, but its capacity to do so under concurrent s ...

Wiley2025

Tree functioning under different soil water availability and atmospheric water demand

Charlotte Grossiord

As a consequence of ongoing climate change, trees are increasingly exposed to atmospheric and soil drought. The project “VPDrought - a novel approach to disentangle atmospheric and soil drought” investigates how trees respond to distinct and combined chang ...

Pensoft Publishers2025

Acclimation to High Vapor Pressure Deficit in Warmer Air Can Reduce Tree Vulnerability to Drought-Induced Mortality

Laura Mekarni, Charlotte Grossiord

Climate change imposes new constraints on tree survival, emphasising two key parameters: the vapour pressure deficit (VPD) and air temperature. Yet, no study has experimentally evaluated drought-induced tree mortality risk following acclimation to elevated ...

2025

VPDrought – a novel approach to disentangle atmospheric and soil drought in a natural Scots pine forest

Charlotte Grossiord

In recent years, an increasing number of studies have reported on forest declines and shifts in species composition in response to changing climatic conditions (Rigling et al. 2012). The intensification of droughts through rising evaporative demand (i.e., ...

Pensoft Publishers2025

Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest

Charlotte Grossiord, Eugénie Isabelle Mas, Christoph Bachofen, Alex Tunas Corzon, Hervé Cochard, Alice Jacqueline Frédérique Gauthey

Climate change is predicted to increase atmospheric vapor pressure deficit, exacerbating soil drought, and thus enhancing tree evaporative demand and mortality. Yet, few studies have addressed the longer-term drought acclimation strategy of trees, particul ...

Oxford Univ Press2024

In vivo X-ray microtomography locally affects stem radial growth with no immediate physiological impact

Pascal Turberg, Laura Mekarni, Charlotte Grossiord, Hervé Cochard

Microcomputed tomography (mu CT) is a nondestructive X-ray imaging method used in plant physiology to visualize in situ plant tissues that enables assessments of embolized xylem vessels. Whereas evidence for X-ray-induced cellular damage has been reported, ...

Oxford Univ Press Inc2024

Quantifying the impact of urban trees on air quality in Geneva, Switzerland

Aurèle Pulfer, Julia Schmale, Charlotte Grossiord, Ilann Ernest Valentin Bourgeois

Atmospheric pollution threatens human health worldwide, with tropospheric ozone (O 3) and particulate matter (PM) among the most harmful pollutants. Urban trees can reduce the concentration of air pollutants through dry deposition on their canopies and sto ...

Elsevier BV2024

The impacts of rising vapour pressure deficit in natural and managed ecosystems

Charlotte Grossiord

An exponential rise in the atmospheric vapour pressure deficit (VPD) is among the most consequential impacts of climate change in terrestrial ecosystems. Rising VPD has negative and cascading effects on nearly all aspects of plant function including photos ...

Wiley2024

Mixing oak and pine trees in Mediterranean forests increases aboveground hydraulic dysfunctions

Charlotte Grossiord, Eugénie Isabelle Mas

Increasing tree species diversity in Mediterranean forests could reduce drought-induced hydraulic impairments through improved microclimate and reduced competition for water. However, it remains unclear if and how species diversity modulates tree hydraulic ...

2024

Tree drought–mortality risk depends more on intrinsic species resistance than on stand species diversity

Charlotte Grossiord

Increasing tree diversity is considered a key management option to adapt forests to climate change. However, the effect of species diversity on a forest's ability to cope with extreme drought remains elusive. In this study, we assessed drought tolerance (x ...

2024

Tree water uptake patterns across the globe

Charlotte Grossiord, Christoph Bachofen

Plant water uptake from the soil is a crucial element of the global hydrological cycle and essential for vegetation drought resilience. Yet, knowledge of how the distribution of water uptake depth (WUD) varies across species, climates, and seasons is scarc ...

Wiley2024

Invasive palms have more efficient and prolonged CO2 assimilation compared to native sub-Mediterranean vegetation

Marco Conedera, Thibaut Michel Georges Juillard, Charlotte Grossiord, Christoph Bachofen, Janisse Deluigi

In sub-Mediterranean ecosystems, shade-tolerant broadleaf evergreens, especially the invasive Trachycarpus fortunei, are spreading uncontrollably in the forest understorey, impeding the regeneration of the native deciduous woody vegetation. Most invasive s ...

Elsevier2024

Soil warming alters tree water use and canopy stomatal conductance in a mixed subtropical forest

Charlotte Grossiord, Christoph Bachofen

As air temperature and vapor pressure deficit (VPD) increase continuously, forests are losing more water through evapotranspiration, with large consequences for local and global hydrological cycles. In regions with high vegetation cover, soil warming can b ...

Elsevier2024

Nature-based solution enhances resilience to flooding and catalyzes multi-benefits in coastal cities in the Global South

Jérôme Chenal, Paolo Perona, Charlotte Grossiord, Montana Marshall, Emmanuel Qays Dubois

Coastal cities are facing a rise in groundwater levels induced by sea level rise, further triggering saturation excess flooding where groundwater levels reach the topographic surface or reduce the storage capacity of the soil, thus stressing the existing i ...

2024

Tree diversity reduces variability in sapling survival under drought

Charlotte Grossiord, Xiaojuan Liu, Jingjing Liang

Enhancing tree diversity may be important to fostering resilience to drought-related climate extremes. So far, little attention has been given to whether tree diversity can increase the survival of trees and reduce its variability in young forest plantatio ...

Wiley2024

Reduced soil moisture drives leaf anatomical shifts more than chronically elevated temperatures in European temperate trees

Thibaut Michel Georges Juillard, Charlotte Grossiord, Janisse Deluigi

Chronic reductions in soil moisture combined with high air temperatures can modify tree carbon and water relations. However, little is known about how trees acclimate their foliar structure to the individual and combined effects of these two climate driver ...

2024