磷素对不同品质类型大豆光合生理的影响

Effect of P_2O_5 on Photosynthetic Physiology of Soybean Cultivars with Different Quality Types

以6个不同品质类型(普通型、高油型和高蛋白型各2个)的亚有限结荚习性大豆品种为材料,采用裂区试验设计,研究了3个磷素水平(0、82.5、165.0 kg.hm-2P2O5)对不同品质类型大豆叶片光合生理的影响。结果表明:施磷对不同品质类型大豆开花期至鼓粒期的光合速率、气孔导度、蒸腾速率、叶面积指数和水分利用效率有较大影响,且施磷有利于提高各品质类型大豆的光合速率、气孔导度等光合生理指标。此外,施磷使生育后期大豆的光合速率、气孔导度等下降速度减缓,其中对高蛋白品种的影响最为明显。高蛋白品种在高磷(165.0 kg.hm-2P2O5)处理下的光合速率、气孔导度等的下降速度均最为缓慢。

Six semi-determinate soybean cultivars of three seed quality types（common,high oil and high protein）were used to study the effect of different P2O5amount（0,82.5,165.0 kg·ha-1）on soybean photosynthetic physiological indexes.The results showed that phosphorus level significantly affected photosynthetic rate（Pn）,stomatal conductance（Gs）,transpiration rate（Tr）,LAI and water use efficiency（WUE）of different quality type soybeans from flowering to grain-filling.And the photosynthetic physiological indicators improved under phosphorus treatment.In addition,in later growth stage the photosynthetic physiology indexes had a slow falling rate under phosphorus treatment,and the high-protein type had the lowest descending rate under high phosphorus（165.0 kg·ha-1）treatment.