Tree-Ring Talk

Tropical explorations: what tree rings can contribute to studying global change effects in the tropics

Tropical forests and woodlands are key components of the global carbon cycle, as illustrated by the strong contribution of tropical vegetation to the inter-annual variation in the global carbon sink. These strong fluctuations in the carbon land sink are associated with precipitation and temperature anomalies, suggesting a strong component of vegetation productivity. Yet, the extent to which such associations also exist for carbon storage in tree stems is poorly understood.

Stronger together: Asynchronous tree growth dampens the impacts of accelerated climate change in a temperate rainforest

In this talk, I will introduce the idea that ecosystems located near glaciers can serve as natural laboratories for global change biology and paleoclimate studies. This is because they have experienced climate changes that were amplified by nearby ice-margin fluctuations. I will report on results from one of these natural experiments in the old-growth temperate rainforest near La Perouse Glacier in Southeast Alaska. We used dendrochronology to observe how tree growth responded to a shift from “normal” to accentuated rates of summer temperature change that occurred in the mid 1800s.

Hacienda de Gila: dendroarchaeology, architecture, and history at the Lyons and Campbell Ranch, Gila, New Mexico.

Buildings have stories. The materials, architecture, design, decoration and other attributes reveal life histories of a structure and often show changes through time. Sometimes, however, the stories are hidden and must be coaxed out of the building. Such is the case of the original Lyons and Campbell Ranch headquarters in Gila, New Mexico. Known in the 1890s as headquarters of the largest cattle ranch west of the Mississippi, the Lyons and Campbell Ranch actually has a much longer and more intriguing story.

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