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Elizabeth Campbell

Canadian Forest Service
Participates in 2 items

Sessions in which Elizabeth Campbell participates

Tuesday 28 June, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
11:30 - 11:45 | 15 minutes

Models of tree growth responses to climate variability provide insight about the potential effects of global warming on forests. Using a unique dataset containing tree ringwidth measurements from all trees (>4 cm in diameter at breast height) in 1ha plots, we modelled time series of annual basal area increment (BAI) in subalpine forests of western Canada, which are expected to be highly sensitive to the effects of global warming. Our objective was to determine how BAI responses to inter...

Sessions in which Elizabeth Campbell attends

Monday 27 June, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
8:30 - 12:30 | 4 hours

MAIDENiso is a numerical process-based model that allows researchers to simulate the growth of a virtual tree. Using daily meteorological data, the model simulates the physical and physiological processes taking place in the tree and its environment, to produce daily and yearly outputs comparable to dendrological observations. The model has been adapted and used successfully in boreal regions in North America. In an inverse mode, tree-ring obs...

13:30 - 17:00 | 3 hours 30 minutes

Free, in person and onlineThe stable isotopic compositions of carbon and oxygen (d13C and d18O) measured in tree rings are valuable proxies for reconstructing paleoclimate and are increasingly used as paleophysiological proxies. Applying these proxies in ecophysiology and paleoclimate can be challenging as they rely on complex process-based models and poorly constrained input data. In recent years, h...

13:30 - 17:30 | 4 hours

Blue Intensity (BI) is a cost-effective analytical method for measuring relative wood density in the rings of conifer tree species. Since early concept papers in the 1990s/2000s, there has been a recent explosion in the application of this method for both dendroclimatology and historical dating as well as other dendro-disciplines. The beauty of BI is that the analytical costs, mainly related to the cost of a h...

Tuesday 28 June, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
9:20 - 9:35 | 15 minutes

Climate change poses an existential threat to trees, given our understanding of the importance of climate in shaping their geographic distributions. Climate envelope models are commonly used to predict how species will respond to climate change. These models give rise to the leading edge-trailing edge paradigm for range change: populations at the cool edge of a species’ distribution are expected to benefit from warming, whereas populations at the warm edge are expected to decline. We chall...

9:50 - 10:05 | 15 minutes
Symposium 1

Forest responses to climate change are highly uncertain, but critical for forecasting and managing forest carbon dynamics. Tree-ring time series data provide annually resolved growth responses to climate, but often lack the stand-level information needed to scale growth up to carbon uptake. In contrast, the U. S. Forest Service Forest Inventory and Analysis (FIA) Program is an exceptional spatial network to estimate forest carbon, but lacks the annual resolution needed to determine how tre...

10:20 - 10:35 | 15 minutes
Symposium 1

Tree-ring time series provide long-term, annually resolved information on the growth of individual trees. When sampled in a systematic context, tree-ring data can be scaled to estimate the forest carbon capture and storage of landscapes, biomes, and ultimately the globe. A systematic effort to sample tree rings in national forest inventories would yield unprecedented temporal and spatial resolution of forest carbon dynamics, and help resolve key scientific uncertainties, which we highlight...

10:20 - 10:35 | 15 minutes

The spatial scale of climate fluctuations, or effective spatial degrees of freedom (ESDOF), depends on the timescale and the forcing: while local scale variability between far away locations may be independent on short timescales, they may become coherent over sufficiently long timescales, or if they are driven by a common forcing. While ESDOF have been estimated from instrumental data over the historical period and climate model simulations, it remains difficult to perform such analysis o...

10:20 - 10:35 | 15 minutes

Growing concerns about vulnerabilities of boreal forests to climate change and disturbances warrants additional information about their impacts on the growth of dominant tree species in different surrounding environments. To address these concerns, we investigated how the surrounding environment influences the growth of such trees and their responses to climate and insect epidemics in stands of eastern Canada’s boreal forest. For this, we focused on 96 black spruce, jack pine, and tremblin...

11:15 - 11:30 | 15 minutes

Ultra high resolution imaging is becoming standard across the sciences and must be a priority for dendrochronology. Large format scanners fail to resolve micro rings and the anatomical structures of increasing scientific interest. Meanwhile, current software limitations include cost, user experience, data management flexibility, and capacity for handling large file sizes. We argue for a new paradigm and present a technology framework that integrates gigapixel macro photography, a cloud-hos...

11:30 - 11:45 | 15 minutes

Tree-ring research has given generations of scientists a long memory of what is acceptable for a tree to be included for data analysis. The established criteria, however, were set through purposeful goals to maximize the response for climatic reconstructions. Ecology is different. Tree-rings are increasingly being used to study a wide swath of ecology, including the carbon cycle or the response of ecosystems to global changes. A fundamental aspect of ecology is to understand the range of r...

14:45 - 15:00 | 15 minutes

In the context of climate and environmental change, the boreal forest is subject to potential changes in structure and function. Stand-level physiological models can be used to predict these responses over time and to understand the interaction between tree ecophysiological processes and climate variability. We present here a project that aims to develop potential growth scenarios for Canadian boreal forest stands based on the characterization of their ecosystem fluxes using the MAIDEN mod...

17:00 - 17:15 | 15 minutes

The global rise in temperature and associated changes in climate have led to decline of forests around the globe. A particularly severe example of this is yellow-cedar (Callitropsis nootkatensis) decline along the coast of British Columbia and Alaska, where anthropogenic climate change has led to reduced insulating snowpack, leaving yellow-cedar roots vulnerable to thaw-freeze events, resulting in freezing damage to roots and water stress during the subsequent growing season. Yellow-cedar ...

Wednesday 29 June, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
8:45 - 9:15 | 30 minutes

Dendrochronology is considered one the most precise of all the scientific dating techniques. However, it requires long sequences of tree rings and a master record for both the species and region in question. At the University of Groningen, we have been pioneering a new approach to dating that combines the precision of dendrochronology with the versatility of radiocarbon dating. It relies on the detection of spikes in the annual radiocarbon record, thought to b...

9:20 - 10:35 | 1 hour 15 minutes

Current and projected changes in climate are estimated to be from 10 to 100 times faster than the natural adaptive capacity of trees whose generation times are long. As extreme climatic events are becoming more frequent and exert a strong selection pressure on tree populations, there is an urgent need to better characterize the genetic variability involved in the response of trees to climate. There is currently a lack of knowledge on the role of genetic variability in tolerance to climatic...

Thursday 30 June, 2022

Time Zone: (GMT-05:00) Eastern Time (US & Canada)
14:05 - 14:20 | 15 minutes

Treeline ecotones at high latitudes and high elevations are generally temperature-limited environments. However, there is evidence that temperature control on tree growth has recently decreased at treelines due to climate change, while water availability is increasingly reported as a seasonally important growth-limiting factor. Analyzing climate-growth responses at intra-annual (wood cell) level can help unravel these complex patterns, but long time series of wood formation data are often ...

14:35 - 14:50 | 15 minutes

Trees exhibit different growth rates and timings of wood formation. However, the factors explaining these differences remain undetermined, making samplings and estimations of the growth dynamics a complicated task based on technical rather than statistical reasons. We collected weekly wood microcores in 159 balsam firs (Abies balsamea (L.) Mill.) from April to October 2018. We tested spatial autocorrelation, tree size, and cell production rates as explanatory variables of xylem phenology, ...