对雷竹光合速率及光照强度、气温、湿度和气孔阻力等对光合速率的影响进行了研究。结果表明 ,在干热条件下 ,雷竹光合速率日变化呈双峰曲线 ,中午前后光合速率下降 ,出现“午睡”现象。“午睡”是大气饱和差引起的气孔阻力增加所致。光照强度、气温、湿度和气孔阻力等因子对光合作用产生显著影响。雷竹光合作用适宜气温为 2 8 2～ 32 2℃ ,适宜光强为 860～ 1 0 2 0 μmol·m2 ·s-1。图 6参 9 The effects of photosynthetic rate, light intensity, air temperature, humidity and stomatal resistance on the photosynthetic rate were studied. The results showed that under dry and hot conditions, the diurnal variation of photosynthetic rate of Dioscorea torreri showed a bimodal curve, and the photosynthetic rate decreased before noon. Siesta is caused by increased stomatal resistance due to poor atmospheric saturation. Light intensity, temperature, humidity and stomatal resistance and other factors have a significant impact on photosynthesis. The optimum temperature for photosynthesis of Dioscorea angstris was from 282 to 32 2 ℃, and the suitable light intensity was from 860 to 120 μmol · m2 · s-1. Figure 6 parameters 9