Abstract:From practical measurement and calculation of the net photosynthetic rate of flag leaf of winter wheat in the field in Tibet Plateau, we got following the results. The light photosynthetic curve of flag leaf of winter wheat in Tibet Plateau approximates to a right angle hyperbola. Apparent quantum yield (AQY) was measured as 0 034μmolCO 2/m 2 s(μmol photons/m 2 s) and it was about two thirds of that in the east plain of China. The air is thin in Tibet Plateau, and the density of carbon dioxide is...