Plant communities are a result of their environment, competition among individuals, and interactions between the plants and co-occurring organisms, such as those in the soil surrounding roots. Human-induced changes in climate and nutrient availability are altering these influencing agents, leading to a loss in community diversity and simplified function. My research investigates the mechanisms that contribute to these structural and functional changes. Projects occur along a latitudinal gradient from Minnesota to Texas and throughout Iowa and in many ecosystems, including experimental cornfields, tall and mid-grass prairie, maple-basswood forest, sub-tropical thorn scrub, post oak savanna, and the Edward’s Plateau. My research results inform management and promotes long-term community and ecosystem sustainability.