S. Caldararu

Long-term ecosystem nitrogen limitation from foliar δ15N data and a land surface model

The paper uses a land surface model and foliar nitrogen isotope data to assess global nitrogen limitation, finding that leaf δ15N trends cannot alone determine nitrogen limitation and that model integration reveals underlying drivers.

Whole-plant optimality predicts changes in leaf nitrogen under variable CO2 and nutrient availability

The paper develops an optimality model to predict leaf nitrogen changes under variable CO2 and nutrient conditions, showing it better captures observed patterns than existing models.