@article{Cheaib2025,
   abstract = {Accurately representing the relationships between nitrogen supply and photosynthesis is crucial for reliably predicting carbon–nitrogen cycle coupling in Earth System Models (ESMs). Most ESMs assume positive correlations amongst soil nitrogen supply, leaf nitrogen content, and photosynthetic capacity. However, leaf photosynthetic nitrogen demand may influence the leaf nitrogen response to soil nitrogen supply; thus, responses to nitrogen supply are expected to be the largest in environments where demand is the greatest. Using a nutrient addition experiment replicated across 26 sites spanning four continents, we demonstrated that climate variables were stronger predictors of leaf nitrogen content than soil nutrient supply. Leaf nitrogen increased more strongly with soil nitrogen supply in regions with the highest theoretical leaf nitrogen demand, increasing more in colder and drier environments than warmer and wetter environments. Thus, leaf nitrogen responses to nitrogen supply are primarily influenced by climatic gradients in photosynthetic nitrogen demand, an insight that could improve ESM predictions.},
   author = {Alissar Cheaib and Elizabeth F Waring and Risa McNellis and Evan A Perkowski and Jason P Martina and Eric W Seabloom and Elizabeth T Borer and Peter A Wilfahrt and Ning Dong and Iain Colin Prentice and Ian J Wright and Sally A Power and Erika I. Hersch‐Green and Anita C Risch and Maria C Caldeira and Carla Nogueira and Qingqing Chen and Nicholas G Smith},
   doi = {10.1111/ele.70015},
   issn = {1461-023X},
   issue = {1},
   journal = {Ecology Letters},
   keywords = {allocation,foliar nitrogen,nutrient network,optimality,photosynthesis,plant growth},
   month = {1},
   pages = {1-13},
   title = {Soil nitrogen supply exerts largest influence on leaf nitrogen in environments with the greatest leaf nitrogen demand},
   volume = {28},
   year = {2025}
}