【摘要】 本文报道了在小麦籽粒灌浆期用水喷雾提高叶片光合速率与单位面积产量的结果.光合速率的提高与叶片气孔阻力降低有关.研究进一步证实了华北地区小麦灌浆期光合作用有明显的“午睡”现象,这种现象与中午前后颇低的空气湿度和较高的空气温度引起的大气饱和差增加有很大关系,并且表明用少量喷水可以改善田间小气候和作物水分状况,减轻光合作用“午睡”现象,提高光合速率,进而增加作物产量.更多还原

【Abstract】 The results of increasing the photosynthetic rate of wheat leaves and the yield of unit area sprayed with water during grain - filling period were reported in the paper. The increase in photosyhthetic rate is related to the decrease in stomatal resistanceof wheat leaves. This experiment futher confirmed that the " afternoon nap " ph -enomenon is obviously shown by the photosynthesis during grain - filling period in north China region. This phenomenon is quite related to the increase in atmospheric saturation deficency under the lowerair humidity and the higherair temperature before and after noon. It indicated that the microclimate in the field and the moisture con -dition of crops could be improved by spraying littile water, lighten the midday deppression of photosynthesis, and increase the photosynthetic rate, thus increasing the crop yield.更多还原