| Ecophysiological responses of summer maize to drought and waterlogging in Huang-Huai-Hai plain |
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| DOI：10.7606/j.issn.1000-7601.2016.04.13 |
| Key Words: drought waterlogging summer maize physiological ecology yield |
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| Abstract: |
| Quantitative effect of drought and waterlogging on photosynthetic capacity, dry matter partition, leaf area growth, yield structure and yield of maize was analyzed by using water control field test in Huang-Huai-Hai plain. The influence mechanism of drought and waterlogging on the growth of summer maize was then discussed. The results showed that drought slowed the development rate of summer maize during the vegetative growth stage, while it increased the development rate during the reproductive growth stage. Waterlogging had little effect on summer maize development. Maximum photosynthetic rate was decreased by 0.54 mol·m-2·s-1 and specific leaf area of summer maize became increased by 8×10-6 hm2·kg-1, while soil moisture from the appropriate humidity during the whole growth period was reduced by 1%. The total above ground dry weight and dry weight of spike of summer maize would be decreased by 0.55% and the yield would be reduced by 155 kg·hm-2, while soil relative moisture during the whole growth period was decreased by 1%. Drought not only shortened the filling period, but also reduced the leaf photosynthetic capacity. Drought made additional dry matter allocated to stems during the vegetative growth stage, which resulted in source shortage of leaf area expansion. It reduced the allocation to storage organs at the reproductive growth stage, which affected yield components. In general, drought casted a negative influence on the growth of maize, although it made thinner leaf and promoted its expansion. Drought finally reduced maize yield. Waterlogging decreased photosynthetic capacity and reduced the distribution of dry matter to spike, which caused reduction of maize yield. |
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