Thirty‐six mesocosms, each containing a two‐species community of Trifolium repens (C 3 legume) and Stenotaphrum secundatum (C 4 grass), were grown in sand with three nutrient regimes, zero N low P, zero N high P and supplied N high P, under ambient (aCO 2 ) and twice ambient CO 2 (eCO 2 ) for 15 months in two greenhouses. Aboveground annual production in the P limited mesocosms did not respond to eCO 2 and was reduced by 50% r...

Accurate knowledge of the response of root turnover to a changing climate is needed to predict growth and produce carbon cycle models. A soil warming system and shading were used to vary soil temperature and received radiation independently in a temperate grassland dominated by Holcus lanatus L. Minirhizotrons allowed root growth and turnover to be examined non‐destructively. In two short‐term (8 week) experiments, root respon...

Arbuscular mycorrhizal (AM) fungi have a major influence on the structure, responses and below‐ground C allocation of plant communities. Our lack of understanding of the response of AM fungi to factors such as light and temperature is an obstacle to accurate prediction of the impact of global climate change on ecosystem functioning. In order to investigate this response, we divided a grassland site into 24 plots, each either u...