Articles tagged with Boreal Forests
Researchers found that the composition of tree species in the Yukon Flats gradually shifted from coniferous trees to deciduous trees, which are more fire-resistant, during a warm period in the Holocene epoch. Current wildfire activity has already surpassed this limit, with the average fire frequency doubling in the last 50 years.
Recent decades have seen a dramatic increase in wildfires in the Yukon Flats of Alaska, with fire frequency surpassing the limit seen during the Medieval Climate Anomaly. This shift towards deciduous forests has significant implications for carbon storage and climate warming, as dry deciduous trees can become highly flammable.
Scientists analyzed long-term data from seven sites in the US and found a substantial increase in water-use efficiency in temperate and boreal forests. This adaptation could enhance timber yields and improve water availability, but may also lead to reduced evapotranspiration and increased continental freshwater runoff.
The boreal forest in northern Alberta showed increased biodiversity up to 50% human disturbance, but then plant species decreased. Researchers found native species were replaced by invasive weeds from Europe and other alien ecosystems.
The Russian boreal forest, the world's largest continuous expanse of forest, is experiencing a rapid shift in vegetation types as temperatures rise. This leads to an increase in evergreen conifers and a decline in larch trees, resulting in a northward progression of evergreens and a retreat of larch forests.
A paper by F. Stuart Chapin III and colleagues presents policy strategies for sustainable management of Alaskan boreal forests in response to climate change, integrating ecological and social sciences. The award recognizes the research's contribution to sustainability science.
Ancient DNA from trees, plants, and insects in a boreal forest reveals temperatures were around 10C in summer and -17C in winter. The findings suggest the global ocean was one to two meters higher during that time compared to current levels.
Four UAF researchers have been awarded significant funding from the National Science Foundation for projects studying the Arctic circumpolar region. The research, including studies on climate change, boreal forests and winter precipitation, aims to better understand the structure of the stratospheric vortex and its impact on ecosystems.
Research suggests tundra areas are greening over the entire growing season, with boreal forests showing significant greening in May and June. However, these gains are offset by browning in July and August, highlighting a need for improved process models of ecosystem responses to climate change.
Researchers found that different snow conditions affect the dynamics of the Canadian lynx. The study showed that surface hardness, determined by warm winter spells, influences how deep the lynx sinks in the snow, impacting its ability to prey on snow hares.
Researchers found that Canadian forest fires can cause large pulses in atmospheric mercury levels, affecting regions like the northeastern US. The study estimated annual emissions from Canadian forests and worldwide boreal forest fires, suggesting a significant impact on mercury levels.
Research finds that larger forest stands can help control caterpillar infestations by reducing the effectiveness of parasites and diseases. The study suggests that forests larger than 100 hectares are more effective in suppressing outbreaks, which could lead to increased fibre production if defoliation is reduced by just one year.
Scientists from Canadian Forest Services found that Canada's forests have shifted from a carbon sink to a source, primarily due to changes in disturbance regimes related to climate change. Strict carbon accounting is necessary to determine whether boreal forests can mitigate atmospheric carbon dioxide.