不同天气对苹果叶片光合特性的影响

对苹果在晴天、阴天和多云天气情况下以及不同月份下叶片的光合特性的研究结果表明,叶片在晴朗天气时的光合强度最高,日变化为双峰曲线,存在＂午休现象＂;在阴天时光合强度最低,日变化为单峰曲线;多云时光合强度居中,日变化为单峰曲线。比较苹果在7月、9月的光合作用,发现7月的光合作用显著高于9月的光合作用,在7月叶片光合作用的日变化为双峰曲线,9月为单峰曲线。不同品种之间也有差异,7月份中熟品种美国8号的光合强度比晚熟品种礼泉短富高,到了9月比礼泉短富低了61.56%。

Effect of Different Weather on the Photosynthetic Character of the Apple''''s Leaves

Apple's photosynthetic characters on different weather were studied.It showed that the best day is the fine day,the worst day is the cloudy day,the nebulous day is in the middle.The diurnal variation of Pn on the fine day is the bimodal curve;it has obvious midday depression phenomena.The diurnal variation of Pn on cloudy day and the nebulous day is the unimodal curve.The photosynthetic rate in July is better than September;the diurnal variation of Pn is the bimodal curve.It has difference between different varieties. The Pn of American 8 higher than Liquan Fuji in July,but in September the Pn of Liquan Fuji is 61.56% higher than American 8.