ou are a u.s. forest service ranger walking through a mature forest community and identifying seedlings (newly sprouted stems). on your walk, you identify three climax tree species germinating in the understory. you decide to perform a 6-month experiment to determine whether you could better manage the forest to increase tree species richness in the understory. in treatment 1, you open a hole in the canopy to let light reach the forest floor. in treatment 2, you build a fence around your plot to keep herbivores out. in treatment 3, you add nutrients to the understory. treatment 4 you keep as a control. after 6 months, you discover that tree species richness in the understory is 10, 1, 9, and 5 in treatments 1, 2, 3, and 4, respectively. which of these new strategies would you not employ to increase species richness?