October 2014

Drought-Associated Tree Mortality: Global patterns and insights from tree-ring studies in the Southwestern U.S.A.

Forests play an important role in the earth system, regulating climate, maintaining biodiversity, and provisioning human communities with water, food and fuel. Interactions between climate and forest dynamics are not well constrained, and high uncertainty characterizes projections of global warming impacts on forests and associated ecosystem services. Recently observed tree mortality and forest die-off forewarn an acceleration of forest change with rising temperature and increased drought.

What can we learn from the arctic shrub (-rings)? Dendrochronological records of shrubs' annual growth in High and Low Arctic sites (Spitsbergen, Greenland, Alaska)

Recent changes in the thermal regime of the Arctic and related tundra expansion in higher latitudes resulted in an intense development of dendrochronological and dendroecological studies in the polar regions. In last decade we observed a significant increase in the use of tree-ring growth analysis in high latitudes where radial growth of woody plants, from shrubs to perennial herbs, is studied. Thermal limitations of cambial growth in the Arctic enable mainly dendroclimatological studies, which application requires a construction of reliable tree-ring chronologies.

Art in the Tree-Ring Lab

An art exhibit, “Marking Time to a Changing Planet”, is now on display in the Bannister Building.

Docent-led One Hour Tour

Docent-led tours last approximately one hour and begin in the lobby of the Bryant Bannister Tree-Ring Building. During your tour you will be introduced to the basic tenets of dendrochronology, view a variety of tree-ring samples and visit the work areas and laboratory spaces of our researchers. Reservations for tours are not required but are highly suggested so that the docents may prepare in advance for your tour.