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We studied the effect of varying amounts of soil nitrogen on Linaria vulgaris and native species. Linaria vulgaris is an invasive weed in the Rocky Mountains that forms monocultures, hindering the growth of native plants. The Rocky Mountain soils are nitrogen-poor, and we expected nitrogen-reduced soils to favor native species. Thus, we expected increased values in the percent cover of native species, species richness, species diversity, plant growth of native species, and net photosynthesis of native species when there was less nitrogen in the soil. Our results showed that species richness decreased over in all plots from 2017 to 2024, with no significant effect of treatment. We also found that species diversity decreased significantly in plots over time, and there was significantly lower species diversity in nitrogen addition plots. Through analyses of historical data from 2017 to 2024, we found that there is no effect of treatment on the percent cover of species for all native plants. However, we found that Linaria vulgaris had a significantly higher percentage of cover in nitrogen addition plots. We also found that treatment had no significant effect on both plant growth and photosynthetic rate in 2024. All data collection was done in Gothic, Colorado. We found that nitrogen treatments do not have a positive effect on the plant community in the nitrogen-poor soils of the Rocky Mountains. This research aids in effective conservation efforts to help preserve biodiversity in the Rocky Mountains by managing Linaria vulgaris.
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