Decomposition on the Iowa Forest Floor
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Shown is a fallen tree in the forest. Iowa has nutrient-dense soil and is an epicenter for agriculture. Decomposition on a log occurs when a fallen tree slowly breaks down over time. Tiny living things like fungi, insects, and bacteria eat the wood and turn it into soft, crumbly soil. As the log decays, it gives nutrients back to the ground, helping new plants grow.
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Liscomb
Iowa Core Standard
5-LS2-1
Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment
Driving Question
- What is the role of the fallen log in the cycle of matter and nutrients?
Probing Questions
- What do you notice in and around the fallen log?
- What do you anticipate will happen as time goes by?
Classroom Suggestions
Students could:
- Observe how a vegetable may decompose in the classroom and note the similarities between them.
- Develop a model of decomposition showing the system of plants, animals, decomposers, and the environment.
- Hike in the area and point out the different levels of decomposition on the ground.
- Use plant and animal identification apps to identify macroinvertebrates in the observation area.
Resources
- Nature | Decay stages of wood and associated fungal communities characterise diversity–decomposition relationships: This scientific journal can support educators with additional details of decay stages and diversity for decomposition relationships.
- National Forest Service (NFS) } Forests of Iowa (2021): This resource update is a brief look at some of the basic metrics that describe the status of and changes to forest resources in Iowa.
- PBS LearningMedia | Think Garden: Soil Composition: Learn how to tell if soil is rich and healthy or lacking in nutrients, which nutrients are essential for plant growth, and what happens if plants lack these nutrients. This video is available in both English and Spanish audio, along with corresponding closed captions.
Contributors
Contributed by Angie Dudley as part of the Iowa STEM Teacher Externship program.
Funding for Iowa Science Phenomena Provided By
