Tropospheric ozone (O3) and carbon dioxide (CO2) are significant drivers of plant growth and chemical composition. We hypothesized that exposure to elevated concentrations of O3 and CO2, singly and in combination, would modify the chemical composition of Trifolium and thus alter its digestibility and nutritive quality for ruminant herbivores.
Muntifering, R.B.; Chappelka, A.H.; Lin, J.C.; Karnosky, D.F.; Somers, G.L. 2006. Chemical composition and digestibility of Trifolium exposed to elevated ozone and carbon dioxide in a free-air (FACE) fumigation system. Functional Ecology. 20: 269-275.