Into the Woods and Back Again: Former Harvard Forest REU Student Fiona Jevon Returns to Mentor New Undergrads

Posted

Fiona Jevin in the field at Harvard Forest in 2010.

Every summer, NSF funds research opportunities for undergraduate students at many LTER sites across the country. These Research Experiences for Undergraduates (REUs) expose students, often for the first time, to the world of ecological research through meaningful participation in ongoing research projects and tutelage under faculty. For many students, a summer spent participating in an… Read more »

LTER Road Trip: Using Tree Rings to Solve Climate Mysteries

Posted

I like to think of Dr. Neil Pederson as a detective. We met in his office at the Harvard Forest Long Term Ecological Research site (HFR-LTER), on the second floor of one of their many beautiful buildings in what feels like a college campus. Multiple sections of tree trunks sit here and there, polished so that the tree rings are clearly visible. Post-it notes and circular stickers mark years of particular interest.

LTER Road Trip: A Hot Time in the Forest

Posted

To evaluate the effects of soil warming, scientists have measured soil gases including methane, nitrous oxide, and carbon dioxide as well as nitrogen fluxes every month since 1991, comparing the heated plots to control plots nearby. One of the most interesting results they have documented comes from the forest’s tiniest organisms – the microbes that digest downed leaves and branches (also known as the ecosystem’s detritus). At first, the microbes worked overtime in the heated plots, releasing more carbon dioxide through their respiration.

LTER Road Trip: Hemlock Hospice

Posted

The hemlock is a native tree species that was once common from northern Alabama to Nova Scotia. Stretching tall with thick needles, the hemlock creates an entire ecosystem beneath its large branches. In the Smoky Mountains, its shade used to cool streams just enough to allow the eastern brook trout to thrive. Unfortunately, these hemlocks are in dramatic decline.

Harvard Forest Director receives Book Award in Environmental Science

Posted

book cover for "A Meeting of Land and Sea"

At its annual Prose Awards luncheon on February 8 in Washington D.C., the American Association of Publishers announced that A Meeting of Land and Sea. Nature and the Future of Martha’s Vineyard had been awarded the 2018 prize for Environmental Science. The PROSE Awards annually recognize the very best in professional and scholarly publishing by… Read more »

Using Drones to Understand the Timing of Fall and Spring

Posted

Overhead view of Harvard Forest LTER site.

As this winter continues to bring freezing temperatures and intense “bomb cyclone” snow storms to the eastern U.S., many are wondering: “When, exactly, will spring arrive?” Researchers with the Harvard Forest LTER were wondering the same thing as they conducted a study using drones to track timing of phenological events in a mixed forest ecosystem… Read more »

A Glimpse into the Future: How Land Use Decisions Will Impact Forest Function

Posted

How can researchers project the ways in which land-use changes will affect ecosystem services when they don’t yet know what course development will take? Integrated scenario analysis models several possible trajectories to examine the interactive effects that land-use change could have on ecosystem structure and function.

Chronic Nitrogen Deposition Restructures Soil Fungal Communities

Posted

New analyses demonstrate that long-term nitrogen enrichment substantially changes the community composition of soil fungi in a temperate hardwood forest. The mix of fungal taxa that emerges appears to be better able to tolerate high nitrogen but less able to break down the lignin in organic matter, which contributes to an overall accumulation of soil carbon.

Chronic Nitrogen Enrichment Slows Fungal Action

Posted

Fungi, often spotted in cold, damp locations, are responsible for decomposing the plant litter that falls to forest floors, enriching soils. Without fungi, dead plant material would inundate ecosystems and overwhelm other organisms. What would happen, then, if anthropogenic nitrogen altered the fungi’s ability to perform this vital ecosystem function? A recent study capitalized on a 28-year nitrogen enrichment experiment at the Harvard Forest LTER site in north-central Massachusetts to find out.  As nitrogen inputs to a system increase, researchers found, fungal decomposition slowed.