N and P fertilization experiment plant species composition and diversity data for South of saddle, 1990 - 2000.

The effects of nitrogen, phosphorus, and nitrogen+phosphorus fertilization on alpine plant species composition and diversity in a dry and a wet meadow community were examined. A point-quadrat system was used to estimate the cover frequencies for each species in plots in the 2 communities on the south slope of Niwot Ridge. Treatments were N, P, N+P, and control. Observations were made once per year per plot over a period of several years. Diversity (Shannon-Weaver) indices were also calculated.