【摘要】 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更多还原

【Abstract】 Lei bamboo(Phyllostachys praecox f.preveynalis)is an elite species of bamboo shoot in Zhejiang.The results of field study indicate that photosynthetic speed of Lei bamboo reaches peaks at 10:00 and 14:00 respectively in dry heat conditions,and lows at noon.The reason of “sleeping”at noon is stomatal resistance increasing by atmospheric saturation deficit.There is a great effect between photosynthetic speed and light intensity,air temperature,relative humidity and stomatal resistance.The optimum temperature for photosynthesis of Lei bamboo is from 28 2 ℃ to 32 2℃,and the optimum light intensity is from 860 μmol·m -2 ·s -1 to 1 020 μmol·m -2 ·s -1 .更多还原