Callaway, R.M., DeLucia, E.H., Thomas, E.M. and Schlesinger, W.H. 1994. Compensatory responses of CO2 exchange and biomass allocation and their effects on the relative growth rate of ponderosa pine in different CO2 and temperature regimes. Oecologia 98: 159-166.

BassiriRad, H., Griffin, K.L., Reynolds, J.F., Strain, B.R. 1997. Changes in root NH4⁺ and NO3^- absorption rates of loblolly and ponderosa pine in response to CO2 enrichment. Plant and Soil 190: 1-9.

De Lucia, E., Callaway, R., and Schlesinger, W. 1994. Offsetting changes in biomass allocation and photosynthesis in Ponderosa pine (Pinus ponderosa) in response to climatic change. Tree Physiology 14: 669-677.

De Lucia, E., Callaway, R., Thomas, E.M., and Schlesinger, W. 1997. Mechanisms of phosphorus acquisition for ponderosa pine seedlings under high CO2 and temperature. Annals of Botany 79: 111-120.

Griffin, K.L., Winner, W.E. and Strain, B.R. 1995. Growth and dry matter partitioning in loblolly and ponderosa pine seedlings in response to carbon and nitrogen availability. New Phytologist 129: 547-556.

Griffin, K.L., Winner, W.E. and Strain, B.R. 1996. Construction cost of loblolly and ponderosa pine leaves grown with varying carbon and nitrogen availability. Plant, Cell and Environment 19: 729-738.

Griffin, K.L., Bashkin, M.A., Thomas, R.B. and Strain, B.R. 1997. Interactive effects of soil nitrogen and atmospheric carbon dioxide on root/rhizosphere carbon dioxide efflux from loblolly and ponderosa pine seedlings. Plant and Soil 190: 11-18.

Johnson, D.W., Ball, T. and Walker, R.F. 1995. Effects of CO2 and nitrogen on nutrient uptake in ponderosa pine seedlings. Plant and Soil 168-169: 535-545.

Johnson, D.W., Ball, J.T. and Walker, R.F. 1997. Effects of CO2 and nitrogen fertilization on vegetation and soil nutrient content in juvenile ponderosa pine. Plant and Soil 190: 29-40.

Johnson, D.W., Thomas, R.B., Griffin, K.L., Tissue, D.T., Ball, J.T., Strain, B.R. and Walker, R.F. 1998. Plant and environment interactions. Journal of Environmental Quality 27: 414-425.

King, J.S., Thomas, R.B. and Strain, B.R. 1996. Growth and carbon accumulation in root systems of Pinus taeda and Pinus ponderosa seedlings as affected by varying CO2, temperature, and nitrogen. Tree Physiology 16: 635-642.

King, J.S., Thomas, R.B. and Strain, B.R. 1997. Morphology and tissue quality of seedling root systems of Pinus taeda and Pinus ponderosa as affected by varying CO2, temperature, and nitrogen. Plant and Soil 195: 107-119.

Maherali, H. and De Lucia, E.H. 2000. Interactive effects of elevated CO2 and temperature on water transport in ponderosa pine. American Journal of Botany 87: 243-249.

Phillips, D.L., Johnson, M.G., Tingey, D.T. and Storm, M.J. 2009. Elevated CO2 and O3 effects on fine-root survivorship in ponderosa pine mesocosms. Oecologia 160: 827-837.

Phillips, D.L., Johnson, M.G., Tingey, D.T., Storm, M.J., Ball, J.T. and Johnson, D.W. 2006. CO2 and N-fertilization effects on fine-root length, production, and mortality: a 4-year ponderosa pine study. Oecologia 148: 517-525.

Tingey, D.T., Johnson, M.G. and Phillips, D.L. 2005. Independent and contrasting effects of elevated CO2 and N-fertilization on root architecture in Pinus ponderosa. Trees 19: 43-50.