A Study On The Response And Recovery Models Of Rice Growth Processes To Waterlogging Disaster

Flooding was one of the main meteorological disasters which lead to great yieldloss in rice production. In order to explore the quantitative effect of flooding on ricegrowth processes and modify existing rice growth models, Nanjing46andYanglianyou8were treated with different durations (1d、3d、6d) and submergencelevel (total submergence and half submergence) during tillering, booting and fillinggrain stages, and the dynamic change of dry matter partition was analyzed during andafter flooding, and the effect of submergence on yield and its components was alsodiscussed in this study. The results showed submergence would increase the partitionindex of yellow leaf and reduce the partition index of green leaf. The most significanteffect was at tillering stage and the lest effect at filling grain stage. The partitionindex of yellow leaf under total submergence was obvious greater that under halfsubmergence. The effect of half submergence on yield was small, but that of totalsubmergence was marked, especially at booting stage because of the obvious decreaseof seed set-rate. The yield loss was aggravated with the increase of duration ofsubmergence. Finally, the quantitative and recovery model on the effect of floodingwas developed.