Community Forestry group and Tree Corps – a new program run out of the Holden Arboretum visited the Tree Ring Lab to learn a bit about tree-sampling and the information contained in the tree records.
Coring a white oak that is slated for removal – we learned a lot from the group. For example, Volcano munching was a topic of conversation a concept we which were not aware.
More coring – Nick then took the group to the wood shop and lab.
Mounting the cores – we look forward to working with the group next year. The Tree Corp Program in its inaugural year seemed a major success – congratulations.
Today is the official last day for AMRE researchers here at the Tree Ring Lab. The AMRE team has accomplished many projects these past 8 weeks.
AMRE students with a sampled oak tree at Brown’s Lake Bog in Wooster, Ohio (Alexis Lanier ’20, Juwan Shabazz ’19, and Kendra Devereux ’21).
Their research started with the principles of dendrochronology, when they learned how to count individual tree rings and measure their widths under the microscopes. From here, the team learned how to run this data in different programs like COFECHA and ARSTAN. This process allowed them to date many historical structures across Northeast Ohio such as Gingery Barn and Miller House and Barn. You can find a full list on our reports page.
AMRE students with Nick Wiesenberg collecting samples from historical structures at Sonnenberg Village in Kidron, Ohio.Alexis and Kendra visiting one of the historical structures at Sonnenberg Village.
The AMRE students also learned how to take these chronologies and make hypotheses regarding past climate by uploading the data to Climate Explorer and running various correlations with other datasets.
We were fortunate enough to go out in the field and personally collect most of the data that we worked with this summer. These eventful trips included a lot of tree coring and required lots of bug spray. Some of the AMRE group’s favorites trips included Stebbin’s Gulch and Brown’s Lake Bog.
Stebbin’s Gulch at the Holden Arboretum (Left to right: Josh Charlton ’19, Juwan Shabazz ’19, Alexis Lanier ’20, Kendra Devereux ’21, and Dr. Wiles).Juwan with the machete, ready to clear a path for the rest of the team at Brown’s Lake Bog.Lining up to cross the moat at Brown’s Lake Bog after a weekend of strong thunderstorms.Kendra Devereux with the sample bag at Barnes Preserve in Wayne County.Josh Charlton ’19 coring a tree at Stebbin’s Gulch in the Holden Arboretum.
The other two summer researchers working in the Tree Ring Lab this summer, Victoria Race and Josh Charlton, have been working with tree ring data collected from Alaska. Their work focuses on the modeling of Columbia Glacier located in Prince William Sound, Alaska. They are currently working on an abstract to submit to the upcoming GSA conference this fall. Stay tuned for more information regarding their project!
AMRE students with Victoria Race ’19 and Arrow at Brown’s Lake Bog.
Special thanks to the National Science Foundation, the Sherman Fairchild Foundation and the AMRE program for helping to make this research possible. Enjoy the rest of your summer!
Summer researchers working in the Tree Ring Lab returned to Stebbin’s Gulch in late May to collect more chestnut oak samples. This increased replication helps us to strengthen our various hypotheses made from the interpretation of our findings.
Our views of the canopy.Team members recording measurements and extracting a core from this living chestnut oak.Kendra and Victoria looking at a giant burl on one of the sampled trees.Team members coring an old chestnut oak along the gulch reaching high into the canopy.
This information is useful in mapping out land use changes in Northeast Ohio. The team identified an abrupt increase in ring width around 1840. They attributed this rise to decreased competition from logging which coincides with the time of most significant settlement in the area.
Read more about their conclusions in the official dendroclimatological report here.
Last week, AMRE students, Kendra Devereux and Alexis Lanier, ventured out to Barnes Preserve in Wooster and The Wilderness Center located in Wilmot, Ohio.
The team collected cores from white and red oak trees at both locations to update their chronologies and analyze land use history of these areas.
Barnes Preserve is a 76-acre park known for its rejuvenating atmosphere, diverse wildlife, and accessible trails. The team focused on collecting samples from mature trees in order to create a new local chronology. The Tree Ring Lab hopes to return to Barnes Preserve and build upon this record in the future.
AMRE students Kendra Devereux (left) and Alexis Lanier (right) coring an oak at Barnes Preserve.Nick Wiesenberg coring a nearby tree.A honeysuckle bush along the trail.The team coring a fallen oak deep in the brush at Barnes Preserve.
The Wilderness Center has an old growth forest named Sigrist Woods that the team was interested in sampling. From these cores they hoped to learn more about a recent storm that damaged and felled many trees in the area. They plan to look more closely at the cores to see if ring widths were affected by this event by either storm damage or loss of competition.
Preliminary results are showing that the trees from Sigrist are dating back to the late 1800’s. Stay tuned for more of their results!
Special thanks for Denny Jordan and Herb Broda for helping facilitate this research.
Brown’s Lake Bog, located near Shreve in Wayne County, Ohio, is a nature preserve and National Natural Landmark that was established in the 1960’s. College of Wooster students have been involved in several past projects at Browns Lake Bog including sediment coring and ice drilling. Last week, the 2018 AMRE students ventured to this local spot to collect tree cores from some red and white oaks in order to perform some climate analysis for the Nature Conservancy and the Friends of Brown’s Lake Bog.
Brown’s Lake Bog is one of a few remaining peatland sites across Ohio that contains an open kettle lake surrounded by a floating sphagnum moss mat. These features are glacial relicts and the knolls surrounding the bog are glacially-formed hills called kames.
This field site is known for its diverse and rare plant community which thrives in the bog’s special acidic and nutrient-poor environment. More than twenty rare plant species can be found here. The carnivorous Northern Pitcher Plant (Sarracenia purpurea) is one of the rare species that attracts bog visitors.
After checking out the kettle lake, the tree ring lab group hiked the short trail to reach the trees sitting on top of the kames. The AMRE students sampled 6 of the oldest white and red oak trees.
AMRE students with a sampled tree (Left to right: Alexis Lanier ’20, Juwan Shabazz ’19, and Kendra Devereux ’21)The carnivorous Northern Pitcher Plant (Sarracenia purpurea) receives nutrients by trapping insects in its fluid-filled cavities.The AMRE students getting coring tips from Nick.Extracting a fresh oak core on top of the kame at Brown’s Lake Bog.Juwan, Kendra, and Arrow sitting on a fallen oak.
Upon returning to the lab, the group mounted up the fresh cores and prepared them for counting and measuring ring widths. This week, Kendra and Alexis are working to update the local chronology and perform various correlations with the data. The final product will be an official climate analysis report.
The map below displays a positive correlation between ring width and precipitation during the months of June and July in the local Wooster area. These months displayed the highest p values and correlations (as shown in the bar graph), which is why these months were selected while creating the map using Climate Explorer. A positive correlation suggests that the more it rained, the better the trees grew (this is expressed in wider ring widths).
Stay tuned for more of their results!
Correlation between ring width at Brown’s Lake Bog and precipitation records.
One of Kendra’s initial correlation maps created with Climate Explorer.
Learning about environmental change from tree rings
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