The type of disturbance effects species diversity. There is greater species diversity in unmowed vs. mowed plots. Fertilizer affects species diversity. Disturbance leads to fewer species.
Annual disturbance increases the diversity of grass species.
Fertilizer treatment decreases species diversity. More nutrients decreases species diversity. Greater species diversity in annual fertilizer treatment than in first year only fertilizer treatment. There is greater species diversity in disturbance treatment than in control treatment. Species diversity is greater in the unmowed treatment than in the disturbance treatment.