摘要
控制交替沟灌是通过调节作物生理过程实现节水的一项新技术.试验结果表明,在控制交替沟灌条件下,叶片蒸腾速率随着土壤含水量的降低而下降,而叶片光合速率则在土壤含水量降到某一数值以前没有显著的变化,从而造成叶片水分利用效率在较轻的水分胁迫下会有一定程度的提高.从叶片水分利用效率的角度分析,控制交替沟灌的灌水下限控制在田间持水量的70%左右效果最好.与对照相比,此时光合产物积累量下降2.1%,而蒸腾耗水量减少9.8%,叶片水分利用效率提高8.8%.
Controlled alternative furrow irrigation(CAFI)is a new technique of saving water by adjusting plant physiological process. Experimental results showed that under CAFI, leaf transpiration rate decreases linearly as irrigation low limit drops, but leaf photosynthetic rate reduces little before the irrigation low limit drops to a critical level. Therefore, leaf water use efficiency will be raised in some content with light water stress. On the view point of leaf water use efficiency, the suitable irrigation low limit is 70% of field capacity under CAFI. Compared with the traditional irrigation treatment, transpiration consumption reduced 9. 8%, photosynthetic yield declined only 2.1%, and leaf water use efficiency raised 8. 8%.
出处
《作物学报》
CAS
CSCD
北大核心
1999年第6期766-771,共6页
Acta Agronomica Sinica
基金
国家"九五"攻关项目96-006-02-02
关键词
玉米
控制交替沟灌
灌水下限
水分利用效率
Maize
Controlled alternative furrow irrigation
Irrigation low limit
Water use efficiency
