不同光照强度西瓜光合速率日变化的研究

摘要

在温室条件下,以吊蔓栽培的小西瓜桔宝为材料,在其果实生长盛期对植株进行不同光照强度处理(自然光和50％自然光),并对其功能叶的净光合速率(Pn),空气温度和叶温、光合有效辐射(PAR)、蒸腾速率(E)、气孔导度( Cond)、胞间CO2浓度(Ci)、水分利用率(WUE)测定.结果表明:50％自然光下,西瓜叶片会出现略微的“午睡”现象,自然光处理植株不会出“午睡”现象；9:00 - 10:00这个时间段,50％自然光下西瓜的Pn远小于自然光处理；其余时间,50％自然光植株的Pn并没有比自然光下生长的叶片低许多,甚至在15:00时出现的光合速率的第2个峰值时已经达到自然光的水平.%In the greenhouse,we used Stereo cultivate variety as JieBao to study the influence under different light intensity. The experiment treatment were natural lighting and 50% natural light; detemine plant Pn, Air temperature, blade temperature,PAR,E , Cond, Ci, WUE of leaves. The results show that under 50% natural lighting, watermelon leaves appeared nap a little,but natural light didn't have. Leaf under 50% natural lighting,its Pn was much less than nater light at 9:00 - 10:00; but at other times its Pn was similar.