He, MiaoMiaoHeBarry, Kathryn EKathryn EBarrySoons, Merel BMerel BSoonsAllan, EricEricAllan0000-0001-9641-9436Cappelli, Seraina LisaSeraina LisaCappelliCraven, DylanDylanCravenDoležal, JiříJiříDoležalIsbell, ForestForestIsbellLanta, VojtěchVojtěchLantaLepš, JanJanLepšLiang, MaoweiMaoweiLiangMason, NormanNormanMasonPalmborg, CeciliaCeciliaPalmborgPichon, Noémie AnnaNoémie AnnaPichonda Silveira Pontes, LaíseLaíseda Silveira PontesReich, Peter BPeter BReichRoscher, ChristianeChristianeRoscherHautier, YannYannHautier2024-10-262024-10-262024-03-11https://boris-portal.unibe.ch/handle/20.500.12422/175442Effects of plant diversity on grassland productivity, or overyielding, are found to be robust to nutrient enrichment. However, the impact of cumulative nitrogen (N) addition (total N added over time) on overyielding and its drivers are underexplored. Synthesizing data from 15 multi-year grassland biodiversity experiments with N addition, we found that N addition decreases complementarity effects and increases selection effects proportionately, resulting in no overall change in overyielding regardless of N addition rate. However, we observed a convex relationship between overyielding and cumulative N addition, driven by a shift from complementarity to selection effects. This shift suggests diminishing positive interactions and an increasing contribution of a few dominant species with increasing N accumulation. Recognizing the importance of cumulative N addition is vital for understanding its impacts on grassland overyielding, contributing essential insights for biodiversity conservation and ecosystem resilience in the face of increasing N deposition.en500 - Science::580 - Plants (Botany)article10.48350/1941623846776110.1038/s42003-024-05999-9