Ecology Letters (2010) 13: 284–291 Abstract Atmospheric CO 2 enrichment generally stimulates plant photosynthesis and nutrient uptake, modifying the local and global cycling of bioactive elements. Although nutrient cations affect the long‐term productivity and carbon balance of terrestrial ecosystems, little is known about the effect of CO 2 enrichment on cation availability in soil. In this study, we present evidence for a no...