Response of Temperate Leymus chinensis Meadow Steppe Plant Community Composition, Biomass Allocation, and Species Diversity to Nitrogen and Phosphorus Addition

Studies on the impacts of fertilization plant production and species diversity are crucial for better maintaining stability grassland ecosystems restoring degraded grasslands. Using a controlled experimental platform in temperate Leymus chinensis meadow steppe ecosystem, effects different levels nitrogen (N) phosphorus (P) addition community structure, biomass allocation, diversity, correlation relationship were explored. The major results as follows: (1) structural composition changed after N P addition; dominance ratio Poaceae plants increased gradually with increasing levels. (2) height, density coverage community, dominant L. total productivity grassland, reduced root–shoot biomass. For example, biomass, gramineous by 84.46–204.08%, 162.64–424.20%, 38.12–46.44%, respectively, addition. (3) richness, evenness indices decreased overall showed binomial regression functional group was highly significantly negatively correlated positively aboveground community; Leguminosae Ranunculaceae Margalef Patrick richness indices; plants. Moderate not only improved structure but also beneficial stability.