He Miao, Barry Kathryn E, Soons Merel B, Allan Eric, Cappelli Seraina L, Craven Dylan, Doležal Jiří, Isbell Forest, Lanta Vojtěch, Lepš Jan, Liang Maowei, Mason Norman, Palmborg Cecilia, Pichon Noémie A, da Silveira Pontes Laíse, Reich Peter B, Roscher Christiane, Hautier Yann
Ecology and Biodiversity group, Department of Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands.
Department of Ecology, Evolution, and Behavior, University of Minnesota, 1479 Gortner Ave, St Paul, MN, 55108, USA.
Commun Biol. 2024 Mar 11;7(1):309. doi: 10.1038/s42003-024-05999-9.
Effects 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.
研究发现，植物多样性对草地生产力（即超产）的影响在养分富集情况下依然稳健。然而，累积施氮量（随时间累积添加的总氮量）对超产及其驱动因素的影响尚未得到充分研究。综合15项施氮的多年草地生物多样性实验数据，我们发现施氮会降低互补效应，并相应增加选择效应，无论施氮速率如何，超产总体上都没有变化。然而，我们观察到超产与累积施氮量之间呈凸曲线关系，这是由从互补效应向选择效应的转变所驱动的。这种转变表明，随着氮积累的增加，正向相互作用逐渐减弱，少数优势物种的贡献不断增加。认识到累积施氮量的重要性对于理解其对草地超产的影响至关重要，可为面对氮沉降增加时的生物多样性保护和生态系统恢复力提供重要见解。
