Mowing exacerbates the loss of ecosystem stability under nitrogen enrichment in a temperate grassland

Summary:
1. Global reactive nitrogen (N) is projected to further increase in the coming years. Previous studies have demonstrated that N enrichment weakens the temporal stability of ecosystem primary productivity through decreased biodiversity and species asynchrony. Mowing is a globally common practice in grasslands; and infrequent mowing can maintain or increase plant diversity under N enrichment conditions. However, it is unclear how infrequent mowing affects ecosystem stability in the face of N enrichment.
2. By independently manipulating the frequency (twice vs. monthly additions yr–1) and rate (i.e., 0, 1, 2, 3, 5, 10, 15, 20, and 50 g N m–2 yr–1) of NH4NO3 inputs and mowing (unmown vs. mown) over three years (2011–2013) in a temperate grassland of northern China, we aimed to examine the interactive effects of N enrichment and mowing on ecosystem stability.
3. The results show that mowing maintained a positive relationship between species richness and ecosystem stability despit...