Tag Archives: Wooster Tree Ring Lab

Concluding 2018 summer of research

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!

 

AMRE at Brown’s Lake Bog

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. 

Read our complete dendroclimatological report here.

Summer Researchers Start on New Project: Gingery Barn

Summer researchers in the CoW Tree Ring Lab have started a new project!

Early Wednesday morning, the group met with a new client, Don Gingery, who is interested in learning the age of his barn located in the Wooster area.

He brought in a few pieces of wood for us to check out and determine if they were good enough for processing. The oak samples did pass the test and qualified for sampling.

Some things we consider:

  • How many rings can we see with the naked eye? If there are only around 30 rings, that would not be a good sample for dating and comparing to the Ohio master chronology.
  • Is the sample whole? We look for the presence of both the outermost and inner rings to ensure we can obtain the most data. It is difficult to date structures if the outer rings are missing because we do not know exactly when that particular tree was felled.
  • Variation in ring width? The more variation between rings, the more interesting the data will be for us when looking at the tree’s relationship to precipitation records.
Oak beam sample.
The second oak sample.
Close-up prior to sanding in the lab.

To prepare the samples, Josh sanded the oak slice on the belt sander to polish its surface while Juwan and Dr. Wiles worked on obtaining a core from the other oak beam. This was done with a drill and special hollow drill bit. Two cores were extracted and immediately mounted.

Drill used for coring the beam.
Dr. Wiles aligning the drill bit prior to drilling in order to hit the heartwood and center of the rings.
Obtaining the first core.
Juwan drilling for the second core.
Obtaining the second core from the oak beam.

This drill bit is different from the hand borers used at the Holden Arboretum because it provides us with a core of a larger diameter. This is beneficial in studying the rings under the scope because we can look at a larger area of each annual ring. This drill is often used by the Tree Ring Lab when coring beams of structures rather than living trees.

The two cores extracted from the oak beam brought in by the client.
Juwan preparing the mount with wood glue.

One of the mounted cores to be left to dry.

When we returned this morning, Juwan, Victoria, and Kendra sanded and polished the two cores. Kendra is now working on measuring the ring widths under the microscope. Next steps include cross-dating and comparing these measured series to other Ohio records. We hope to then be able to provide our client with a report of our findings including a calendar date for the Gingery structure.

Stay tuned for updates!!


Our final report can be found here.

Summer 2018 Research in the CoW Tree Ring Lab

This summer, students through the AMRE program will be working in the lab doing historical dating. Kendra Devereux, Alexis Lanier, and Juwan Shabazz will be working with clients to date local barns, update chronologies, and study past climate.

Two additional students are working in the lab with data collected from Columbia Glacier in Prince William Sound, Alaska. Josh Charlton and Victoria Race will be helping out the AMRE students and also spending time with data collected from Columbia Glacier. Josh is working on constructing a model of the rapidly retreating Columbia Glacier and Victoria will be looking more closely at Blue Intensity data obtained from tree cores collected in Columbia Bay.

Work started earlier this week and the group went out in the field yesterday for the first time together. We headed up North to the Holden Arboretum to collect core samples from living Chestnut Oak trees in Stebbins Gulch.

2018 “Tree Huggers” From left to right: Victoria Race, Kendra Devereux, Alexis Lanier, Josh Charleton, and Juwan Shabazz
Alexis removing tree borer after extracting core from this chestnut oak.
Taking some measurements along with a few cores from this living chestnut oak.
Juwan and Kendra showing off their extracted cores.
Dr. Wiles checking the budding leaves of a chestnut oak.
One of our freshly extracted cores.

Today we finished mounting the cores and will begin dating them after they have been sanded. These samples will be used to update the chronology from the Holden Arboretum which has not been updated in several decades. We plan on looking specifically at precipitation data extracted from these cores and then writing an official report of our findings for the researchers at Holden.

Chestnut oak cores collected from Stebbins Gulch before mounting process.
Close-up of a damp core before mounting.

In the coming weeks, the group will be working on various projects including the Holden chronology, barn dating, and Columbia Glacier data. Stay tuned for updates!!

You can also follow the Geology Club instagram for more information and photos along with the departmental Facebook page.