干旱-复水对不同玉米品种冠层结构与水分利用效率的影响

Effects of Drought Stress and Re-watering on Canopy Architecture and Water use Efficiency of Two Maize Genotypes

以抗旱性不同的二个玉米品种(‘郑单958’和‘户单四号’)为材料,采用防雨池栽的方式控制土壤水分,研究扬花期干旱-复水对玉米冠层结构、产量、耗水量和水分利用效率的影响。结果表明,扬花期干旱-复水后二个玉米品种的叶面积指数和株高均出现补偿效应,‘郑单958’补偿效应优于‘户单四号’;‘郑单958’的群体透光系数在干旱-复水中变化不大,而‘户单四号’的群体透光系数在干旱-复水后均增加,二个玉米品种平均叶倾角和消光系数成负相关;‘郑单958’干旱-复水处理的水分利用效率无变化,而‘户单四号’降低,是由于‘郑单958’在产量降低的同时减少了耗水量,而‘户单四号’耗水量相对于产量减少幅度较小。

Two maize genotypes（＇Zhengdan958＇ and ＇Hudan4＇） in different drought tolerance were screened to study the effects of canopy architecture,yield,Water consumption and water use efficiency（WUE） under drought stress and re-watering during flowering stage.The results showed that compensation could happen on the plant height,leaf area index（LAI） of two maize varieties after rewatering but that of ＇Zhengdan958＇ was significantly stronger;Transmission coefficient for diffuse penetration（TCDP） and radiation penetration（TCRP） of ＇Zhengdan958＇ had no obvious change under drought stress and re-watering but ＇Hudan4＇＇s increased.Mean leaf inclination angle（MLIA） and extinction coefficient of two varieties were negative correlation.Owing to the reduction both in yield and water consumption,the WUE of ＇Zhengdan958＇ had no change under drought stress and re-watering.Comparing to the yield the water consumption had little reduction,so the WUE of ＇Hudan4＇ dropped.