不同肥力条件下大豆群体内叶片气孔阻力变化

Change of Stomatal Resistance in Soybean Canopy at Deferent Nutritional Levels

根据田间实测资料,文中着重分析了在人为控制适宜水分条件下,4种肥力水平:无肥、中肥、高肥、有机+无机条件下大豆群体内叶片在1日内不同时间气孔阻力(Rs)差异以及不同层次和不同时期的叶片的日变化.结果表明,大豆群体内叶片Rs以中等肥力的为最低,无肥的为最高,花期夜间和上午群体内不同层次叶片相应部位的Rs是由冠层上部向下至中部在花期逐渐减小,下午正相反.在结英期Rs均增大,但无规律.大豆群体内叶片Rs的日变化规律为在下午17～19时出现峰值,上午Rs较低.图4,参7。

Based on the measurement in the field, this paper mainly analyses the difference of stor-matal resistance (R.) at four nutritional levels:no fertilizer, middle fertilizer, high fertilizer, organic and inorgainc fertilizer at different time of a day in the canopy and the diurnal variation of different period. The soil moisture was controlled at adaptable level. The result shows,that in the canopy, the lowest R, is the middle fertilizer. the highest R, is the no fertilizer, during night and morning of blooming period, the R, of different layers of leaves decreased from the top to the middle of the canopy, during afternonn, it was contrary. But during odding period, all the R. was increased, but no regularity, the highest R, was found at 17~19 o'clock, the R, in the morning was low.