Wisconsin does this to preserve native ecosystems! I believe this particular land is maintained by the County.

Prescribed fire is the intentional application of fire to a specific pre-planned area, under specific environmental conditions, to accomplish planned land management objectives. Without the use of prescribed burning as a management tool, Wisconsin could lose many of its native grassland, wetland and savanna plant communities.

https://dnr.wisconsin.gov/topic/forestfire/prescribedfire

https://www.danecountyparks.com/Volunteer/Prescribed-Burns

https://www.cityofmadison.com/parks/projects/2024-prescribed-burns