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...

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...

Tree-ring time series provide long-term, annually resolved information on the growth of individual trees. However, public tree-ring archives contain a considerable portion of data collected from trees that have been selected with specific research questions in mind (e.g., for climate reconstruction).  This makes these archives a biased representation of the sensitivity of forest ecosystems to ongoing climate variation (e.g. temperature, precipitation), including non-stationarity (i.e....

Tree-ring time series provide long-term, annually resolved information on the growth of individual trees. However, public tree-ring archives contain a considerable portion of data collected from trees that have been selected with specific research questions in mind (e.g., for climate reconstruction).  This makes these archives a biased representation of the sensitivity of forest ecosystems to ongoing climate variation (e.g. temperature, precipitation), including non-stationarity (i.e....

The Tiger Creek Preserve in central Florida has one of the highest concentrations of threatened and endangered plants and animals in the United States.  Historically it was probably a longleaf pine savanna, but fire exclusion in recent decades has almost certainly led to increased basal area by mid-story oaks (mainly Quercus geminata and Q. laevis).  Determining the date of establishment of these trees, as well as the early fire history of the site, would provide evidence to supp...

"Multi-centennial to millennial-long oak ring width chronologies from living and relict wood are frequently used for climate reconstructions, but the amount of explained hydroclimatic variation remains relatively small. Although stable carbon and oxygen isotopic ratios (δ13C and δ18O values) in tree rings may offer enhanced climate sensitivity, our understanding of their paleoclimatic sensitivity is still limited by the general lack of well-replicated and high-resolution datasets. Here, we...

Trait plasticity supports tree growth and survival in multiple environments and is important at the edges of species ranges, with limited tree growth. Xylem anatomical traits determine sap, nutrient flow and mechanical strength. Trait analysis can provide information on species adaptation to extreme climatic conditions. My project studies xylem anatomical traits over the distribution range of the sugar maple in Quebec, where it finds its northern limit. We intend to understand the links be...

The Miombo woodlands of interior Africa are fire adapted ecosystems with a relatively open canopy dominated by Brachystegia spp., Julbernardia spp., and Isoberlina spp. These ecosystems are threatened due to deforestation, habitat fragmentation, and impacts from climate change, and in Zambia, they are further threatened by the rapidly growing mining industry which contributes to air pollution, contamination of soils and water, and land degradation. In this study, we used modified variable ...

Despite their potential benefits, streamflow reconstructions from tree-rings have not been widely used in water systems analysis because the flow is generally constructed at annual resolution, which may be too coarse for analysis of drought/flood vulnerability and decision making. In semi-arid regions of Chile there are very good relationships between these daily and annual flow, which is explained because within these regions, few hydrological events within a year explain most of the annu...

In eastern boreal Canada, in the absence of long gauge records, changes in tree-ring anatomy of periodically flooded trees have allowed reconstruction of spring floods in natural rivers. This study analyzes the effect of regulation on the flood rings (FR) occurrence and on ring widths in Fraxinus nigra trees growing at 5 sites distributed along the Driftwood River floodplain to determine if a flood reconstruction using FR could be done in regulated rivers. Driftwood River was regulated by ...

Photosynthesis and tree-growth are interconnected processes that are independently modulated by environmental variables. The lack of co-located high spatiotemporal resolution measurements of photosynthesis and growth has limited our understanding of their relationship with each other and their environment. Here, we study photosynthesis and tree-growth at near-instantaneous timescales using in-situ and satellite remote-remote sensing, point dendrometers, quantitative wood anatomy, and Pulse...

Fire-dependent red pine (Pinus resinosa Ait.) vegetation communities in the central Appalac...

Dendrochronological archives in the tropics of the Americas have been under-studied for a long time. Some of the challenges include the Identification of tree-ring boundaries in certain tree species, absence of winter dormancy associated to low temperatures in most of the cases, and logistic difficulties of fieldwork in remote sites. However, part of the slow progress is also related to the fact that historically much less resources have been inv...

In their book chapter in 2011 Gagen et al. (2011) highlighted the need for stable isotope dendroclimatology to move beyond studies that simply demonstrate ‘potential’. This symposium, more than a decade since this publication, will focus on dendrogeochemical studies that demonstrate that the field has moved beyond studies focused on ‘potential’. In particular, this session will strive to identify compelling new insights into unique aspect...