Key points are not available for this paper at this time.
Edward B. Rastetter, Goran I. Agren, Gaius R. Shaver, Responses of N-Limited Ecosystems to Increased CO₂: A Balanced-Nutrition, Coupled-Element-Cycles Model, Ecological Applications, Vol. 7, No. 2 (May, 1997), pp. 444-460
Rastetter et al. (Thu,) studied this question.