The average photosynthesis rate of vegetative shoots at all radiation gradients was 1 . 35 times sizes of reproductive shoots . the transpiration rates of shoots were increasing with the intensity of simulated photosynthetic radiation 两种类型植株蒸腾速率日变化趋势基本一致，在9 10时达到最大值，随着气温和叶温的升高，气孔导度的降低，水分供应的减少，蒸腾速率逐渐减小。
