FIGURE 2. Response of aboveground biomass of Stipa breviflora (a, b), Agropyron mongolicum (c, d),Cleistogenes squarrosa (e, f), and Chenopodium album (g, h) to nitrogen addition (N) and phosphorus addition (P) in mycorrhizal (black bars; non-benomyl addition) and mycorrhizal-suppressed (white bars; benomyl addition) plots in 2019 (a, c, e and g) and 2020 (b, d f and h). F, fungicide application. Data are presented as means + SE. *p < 0.05; **p < 0.01; NS p> 0.05.