The manuscript is interesting and addresses a central topic in ecology: impact of biological invasions on native communities. Besides that, the study brought a long-term observational data and studies with such a long period are important to understand the ecological processes behind biological invasions. The authors showed that garlic mustard abundance is a key predictor of patterns of plant diversity across invasion intensity and environmental heterogeneity in a way that is consistent with mutualism disruption. Their work suggests that the mutualism disruption hypothesis can provide generalizable predictions of the impacts of allelopathic invasive plants that are evident at a broad spatial scale. However, although the study presents the results of original research, improvements are necessary. I strongly recommend that the authors have someone check the language.

Although the authors made the requested changes, the text still need a language review. In general, the authors need to standardize the verb tenses to make the text clear.