Tree-Ring Talk

A refined understanding of historical fire regimes in temperate rainforests of the Pacific Northwest

Temperate rainforests in the Pacific Northwest are renowned for their tremendous biomass, structural complexity, and because many conifer species reach their greatest size and age in the region. Temperate rainforests have a reputation as mossy and damp forests where fires are infrequent and predominantly high severity.

Open science improvements in dendrochronology and data processing pipelines for quantitative wood anatomy

The presentation explores current practices that exemplify open science in dendrochronology, illustrating the communal progression towards transparent, accessible research. A key focus is the introduction of innovative tools specifically designed for quantitative wood anatomy (QWA) and how to integrate QWA data into existing dendrochronology data infrastructure. These tools are part of a refined data processing pipeline, tailored to manage the varied data produced for QWA studies.

Ecology-centered tree-ring research at ForestGEO

Reliable projections of future carbon (C) dynamics are essential to resource management decision making under a changing climate. A hybrid-biometric modelling approach that combines tree-ring based stand reconstruction and the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3) to estimate past magnitude and inter-annual variation of ecosystem carbon stocks and fluxes including net primary production (NPP), net ecosystem production (NEP), and heterotrophic respiration (Rh) can be used to generate additional corroborative data that may reduce uncertainty in C flux estimates.

A hybrid biometric-modelling approach for estimating carbon stock and flux indicators from tree-ring data

Reliable projections of future carbon (C) dynamics are essential to resource management decision making under a changing climate. A hybrid-biometric modelling approach that combines tree-ring based stand reconstruction and the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3) to estimate past magnitude and inter-annual variation of ecosystem carbon stocks and fluxes including net primary production (NPP), net ecosystem production (NEP), and heterotrophic respiration (Rh) can be used to generate additional corroborative data that may reduce uncertainty in C flux estimates.

Contrasting impacts of climate warming on Himalayan hemlock (Tsuga dumosa) growth: seasonal and elevational variations

Ongoing climate change can have varying impacts on tree growth within the growing season and across their elevation ranges, with important implications for forest ecosystem functions and services. However, our knowledge of these effects on climate-sensitive Himalayan forests is still limited. Here, we explore the elevational changes in climatic factors driving long-term changes in the radial growth of Himalayan hemlock (Tsuga dumosa), including recent responses to unprecedented climate warming in the central Himalayas.

A 250-year perspective on high spring flows and climatic drivers in eastern boreal Canada from flood rings

Flood severity in eastern boreal Canada has increased in recent decades (1990–2020) and is likely to increase with projected climate change in the 21st century. The lack of instrumental hydroclimatic data makes the study of paleoenvironmental indicators necessary to identify historical trends and long-term hydroclimatic trajectories. However, in boreal environment where water is not a limiting factor to tree growth, using tree ring width as a single proxy might not allow to capture a complete spectrum of hydrological variability.

Linking carbon fluxes, tree-rings, and xylem anatomy to better understand the processes of carbon allocation to aboveground woody biomass under drought conditions

Carbon allocation to woody tissues is a key set of processes underlying biomass increment during a tree’s growing season. Existing research has rarely addressed this process from a long-term perspective and its interannual to decadal dynamics remain poorly constrained. This also limits our understanding of the sub-seasonal connections and dynamics between carbon uptake and stem growth under a warming climate.

At the crossroads: how tree-ring reconstructions can shape policy to protect vulnerable communities in the Colorado Basin

Tree-Ring Talks Seminar

Wednesday, October 4 at Noon, MST

 

Please join us for a presentation by Dr. George Rhee on "At the crossroads: how tree-ring-reconstructions can shape policy to protect vulnerable communities in the Colorado Basin" in Bannister 110 or via zoom.

 

Abstract

Single-year dating of Siberian Scythian kurgans with 14C spike

Abstract

Photosynthetic carbon isotope discrimination in trees: observations, predictions, and drivers

Abstract: Under elevated CO2, photosynthetic carbon isotope discrimination is expected to increase in response to photosynthesis stimulation driven by the growth of atmospheric CO2. While this response is widely documented in laboratory, field experiments and short-term observations, long-term proxies indicate that such response is not universally observed in forested ecosystems.

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