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Promoting Healthy Forests Through Research at Working Woods

May 29, 2020


If you have been hiking on the Bole Woods loop in the last two years, you may have noticed some strange white pipes sticking out of the ground, or perhaps a group of eager young ecologists measuring trees or counting seedlings. “What is this all about?”, you may ask yourself. This is Working Woods, a 76-acre living laboratory where a 40-year-old forest is currently undergoing a transformation, and in the process is teaching us how to manage Ohio’s valuable forests.

In recent decades, much of Ohio’s agricultural land has been abandoned; left to succeed back to forest. The composition of these post-agricultural forests is often drastically different from the old-growth forests that preceded them, with this agricultural legacy influencing everything from the trees that make up the canopy, to the smallest microbes in the soil. If you walk through one of these post-agricultural forests, you may notice many closely spaced, thin trees. These trees are all about the same age and represent just a few species. They grow slowly due to intense competition with the trees around them. You will also see dense thickets of invasive shrubs such as multiflora rose, glossy buckthorn, honeysuckle, and privet. These invasive shrubs suppress native vegetation like the spring ephemerals we all know and love. These young forests also lack many essential features that provide habitat for wildlife and support biodiversity such as standing snags (dead trees), decaying down wood, and canopy openings created by the natural die-off of older trees.

Here in the Research Department’s Community Ecology lab, we study forest health, restoration, and best management practices. We’re using Holden’s Working Woods, to explore how forest management practices, particularly canopy thinning and invasive species removal, can help improve the health of these forests and return them to a state more closely resembling old-growth forests. We collect data on invasive species cover, rates of tree growth, seedling recruitment, herbivory, plant diversity, and light levels in order to quantify the impacts our treatments have on the forest. The research done in Working Woods lies at the interface of basic and applied ecology – the work we are doing here not only informs forest management practices, but also helps us understand the drivers of change in forests and the forces that maintain biodiversity. This research will increase our ability to promote healthy forests here at the Arboretum, across Ohio, and beyond.

A characteristic young, post-agricultural forest. Notice the thin, closely spaced trees that are low in diversity (mostly maples and tulip poplars), and the mid-story thicket of invasive shrubs including multiflora rose, buckthorn, honeysuckle and privet.
A characteristic old-growth forest. This forest has fewer, but larger trees, that are more widely spaced, allowing for each tree to have a full and healthy canopy. These old-growth forests support many tree species including American beech, oak species, hickory species, maple species, eastern hemlock, and more. The wide range of tree ages in old growth forests creates a more stable ecosystem, allowing for the natural death of older trees that create essential habitat for wildlife, and canopy gaps allowing establishment of the next generation of tree seedlings. These old-growth forests are less susceptible to plant invasion, typically lacking a dense understory thicket of exotic shrubs.

Interns Brooke Seitz and Caleb Lumsden collect data in Working Woods. This tree is one that we are closely monitoring. We collect data on herbaceous plants and seedlings growing around the tree and use that metal band to track weekly growth of the tree

We have over 450 Target Trees in Working Woods, each with its own unique ID so we can monitor the growth of this tree for years to come.

Intern Brooke Seitz stands next to a square plot (marked with PVC pipe) in which we measure woody and herbaceous vegetation to track plant communities in Working Woods. This monitoring allows us to measure how forest management affects plant biodiversity, invasive species cover, and tree seedling recruitment.

We thin the canopy by selectively girdling (cutting a ring around the tree – pictured here) or felling (cutting down) select trees. Girdling causes the tree to die slowly and will provide the standing snags that this young forest currently lacks. Felling is done when girdling may cause the tree to fall in an unsafe or destructive way. Felling provides decaying wood on the forest floor. Though I am a tree lover as much as the next and hate to see trees die, the process of thinning the canopy provides room for new trees to establish while providing important wildlife habitat.

Rory Schiafo, Research Specialist, measures and counts multiflora rose stems around one of our Target Trees. We can use this data to understand how invasive species cover affects understory plant dynamics and to gain a better understanding of the best practices to manage this invasive species.

Rory Schiafo

Research Specialist

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