The researchers studied the diversity of trees in parks in Yuxi. They looked at the types of plants, how many different species there were, and how evenly they were distributed. In Hongta Park and Jiulong Park, they found 14 and 7 plant species that were commonly used. The diversity of trees was higher in Jiulong Park compared to Hongta Park. Overall, the study showed that there is a variety of trees in these parks, with some species being more common than others.