A5014768500- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Fire effects on ecosystems
- Tree Root and Stability Studies
- Plant responses to elevated CO2
- Ecology and Vegetation Dynamics Studies
- Horticultural and Viticultural Research
- Forest Ecology and Biodiversity Studies
Université du Québec à Chicoutimi
2013-2024
Ministry of Natural Resources and Wildlife
2024
Università degli Studi della Tuscia
2012
Nonstructural carbohydrates (NSCs) play a crucial role in xylem formation and represent, with water, the main constraint to plant growth. We assessed relationships between xylogenesis NSCs order (1) verify variance explained by (2) determine influence of intrinsic (tissue supplying carbon) extrinsic (water availability temperature) factors. During 2 years, wood was monitored saplings black spruce (Picea mariana) subjected dry period about 1 month June exposed different temperature treatments...
Abstract Because of global warming, high‐latitude ecosystems are expected to experience increases in temperature and drought events. Wood formation will have adjust these new climatic constraints maintain tree mechanical stability long‐distance water transport. The aim this study is understand the dynamic processes involved wood under warming drought. Xylogenesis, gas exchange, relations anatomy black spruce [ Picea mariana (Mill.) B.S.P.] saplings were monitored during a greenhouse...
Wood formation in trees represents a carbon sink that can be modified the case of stress. The way metabolism constrains growth during stress periods (high temperature and water deficit) is now under debate. In this study, amounts non-structural carbohydrates (NSCs) for xylogenesis black spruce, Picea mariana, saplings were assessed high drought order to determine role sugar mobilization osmotic purposes its consequences secondary growth. Four-year-old spruce greenhouse subjected different...
Effects of temperature and water deficit
Warming and drought will occur with increased frequency intensity at high latitudes in the future. How heat water stress can influence tree mortality is incompletely understood. The aim of this study was to evaluate how carbon resources, stem hydraulics, wood anatomy density determine ability black spruce saplings survive daytime or night-time warming (+ 6 °C comparison control) combination a period. Plant relations, dynamics non-structural carbohydrates starch, rate, were monitored....
In Mediterranean ecosystems, a thorough understanding of seedling regeneration dynamics as well good predictive ability the process is essential for sustainable forest management. Leveraging capacity multilayer perceptron (MLP) recognized artificial intelligence methodology, authors analyzed real case study with dataset encompassing environmental, ecological, and forestry variables. The focused on cork oak (Quercus suber, L.) dynamic, which critical maintaining ecosystem resilience. A set 10...
Summary Traditional phenological models use chilling and thermal forcing (temperature sum or degree‐days) to predict budbreak. Because of the heightening impact climate other related biotic abiotic stressors, a model with greater biological support is needed better Here, we present an original mechanistic based on physiological processes taking place before during budbreak conifers. As general principle, assume that phenology driven by carbon status plant, which closely environmental...
Budburst is a pivotal event in plant life, representing crucial response to seasonal meteorological shifts. Boreal tree species exhibit species-specific phenologies, and the rate of phenological changes under warming conditions may differ among these species. In this study we aim investigate timing budburst three coniferous [Balsam fir (Abies balsamea), black spruce (Picea mariana) white glauca) (Pinaceae)]; identify main drivers budburst, its advance spatiotemporal patterns relation climate...
We investigated how the surrounding environment influences growth of dominant trees and their responses to temperature insect epidemics in boreal forests eastern Canada. focused on 82 black spruce jack pine focal stands spanning a double gradient species diversity soil texture within 36 km 2 area western Quebec. For these trees, we compared diameter at breast height, rates, temperature–growth relations, during defoliator epidemics. used linear models study tree attributes properties affected...
Abstract Climate change is projected to intensify the global hydrological cycle and increase temperatures. Excess N deposition could limit plant productivity because of a lack plant–soil system efficiency with reduced water availability. However, effects soil warming N‐addition on tree transport use remain poorly understood. This study aimed quantify associated meteorological variables sap flux density stem radius variation in black spruce ( Picea mariana [Mill.] B.S.P.). From 2008 2014, we...
In the long term, defoliation strongly decreases tree growth and survival. Insect outbreaks are a typical cause of severe defoliation. Eastern spruce budworm ( Choristoneura fumiferana Clem.) one most significant disturbances Picea Abies boreal forests. Nevertheless, in conifers, 2-year has been shown to quickly improve water status, protect foliage decrease loss. It suggests that effects time-dependent could switch from favorable short term unfavorable when duration exceeds 5–10 years. A...
<p>Traditional phenological models use the concepts of chilling and thermal forcing (temperature sum or degree-days) to predict buds break. Even if new model formulations get more sophisticated with time, bases still rely on effect time temperature in interaction, not, photoperiod. Because increasing impact climate other related biotic abiotic stressors, a biological support is urgently needed order accurately bud We have developed calibrated mechanistic that based...