• Ainsworth EA, Long SP. 2005. What have we learned from 15 years of free-air CO2 enrichment (FACE)? A meta-analytic review of the responses of photosynthesis, canopy properties and plant production to rising CO2. New Phytologist 165: 351372.
  • Bonkowski M. 2004. Protozoa and plant growth: the microbial loop in soil revisited. New Phytologist 162: 617631.
  • Cheng WX. 1999. Rhizosphere feedbacks in elevated CO2. Tree Physiology 19: 313320.
  • Cheng W, Kuzyakov Y. 2005. Root Effects on Soil Organic Matter Decomposition. In: RoyalZobe ISWright, eds. Roots and Soil Management: Interactions Between Roots and the Soil. Madison, WI: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America. 119143.
  • Dakora FD, Drake BG. 2000. Elevated CO2 stimulates associative N-2 fixation in a C-3 plant of the Chesapeake Bay wetland. Plant, Cell & Environment 23: 943953.
  • Finzi AC, Moore DJP, DeLucia EH, Lichter J, Hofmockel KS, Jackson RB, Kim HS, Matamala R, McCarthy HR, Oren R, Pippen JS, Schlesinger WH. 2006. Progressive nitrogen limitation of ecosystem processes under elevated CO2 in a warm-temperate forest. Ecology 87: 1525.
  • De Graaff M-A, Six J, Van Kessel C. 2007. Elevated CO2 increases nitrogen rhizodeposition and microbial immobilization of root-derived nitrogen. New Phytologist 173: 778786.
  • Grayston SJ, Vaughan D, Jones D. 1996. Rhizosphere carbon flow in trees, in comparison with annual plants: The importance of root exudation and its impact on microbial activity and nutrient availability. Applied Soil Ecology 5: 2956.
  • Hodge A, Millard P. 1998. Effect of elevated CO2 on carbon partitioning and exudate release from Plantago lanceolata seedlings. Physiologia Plantarum 103: 280286.
  • Johnson DW. 2006. Progressive N limitation in forests: Review and implications for long-term responses to elevated CO2. Ecology 87: 6475.
  • Jones DL, Healey JR, Willett YB, Farrar JF, Hodge A. 2005. Dissolved organic nitrogen uptake by plants: an important N uptake pathway? Soil Biology and Biochemistry 37: 413423.
  • Jones DL, Hodge A, Kuzyakov Y. 2004. Plant and mycorrhizal regulation of rhizodeposition. New Phytologist 163: 459480.
  • Marschner H. 1995. Mineral Nutrition of Higher Plants. London: Academic Press.
  • Norby RJ, O’Neill EG, Hood WG, Luxmoore RJ. 1987. Carbon allocation, root exudation, and mycorrhizal colonization of Pinus echinata seedlings grown under CO2 enrichment. Tree Physiology 3: 203210.
  • Paterson E. 2003. Importance of rhizodeposition in the coupling of plant and microbial productivity. European Journal of Soil Science 54: 741750.
  • Phillips DA, Fox TC, Six J. 2006. Root exudation (net efflux of amino acids) may increase rhizodeposition under elevated CO2. Global Change Biology 12: 561567.
  • Uselman SM, Qualls RG, Thomas RB. 2000. Effects of increased atmospheric CO2, temperature, and soil N availability on root exudation of dissolved organic carbon by a N-fixing tree (Robinia pseudoacacia L.). Plant and Soil 222: 191202.
  • Zak DR, Pregitzer KS, King JS, Holmes WE. 2000. Elevated atmospheric CO2, fine roots and the response of soil microorganisms: a review and hypothesis. New Phytologist 147: 201.