| Effects of different drought stresses and re-watering on sap flow dynamic of spring maize Danyu 39 |
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| DOI：10.7606/j.issn.1000-7601.2016.02.27 |
| Key Words: maize drought stress rewatering sap flow rate |
| Author Name | Affiliation | | YU Wen-ying | Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110166, China | | JI Rui-peng | Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110166, China | | FENG Rui | Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110166, China | | WU Jin-wen | Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110166, China | | ZHANG Yu-shu | Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110166, China | | WANG Peng | Meteorological Observatory of Liaoning Province, Shenyang, Liaoning 110166, China | | WANG Ting | Institute of Meteorological Science of Liaoning, Shenyang, Liaoning 110166, China |
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| Abstract: |
| A field experiment of water stress and rewatering for maize was carried out using the large moving water-proof shed. The effects of different water stresses and rewatering on the sap flow rate of maize and its response to environmental factors were revealed by analyzing the variations of sap flow rates. The results showed that the daily dynamic of maize sap flow under different water conditions exhibited a single peak curve in sunny days, and displayed multiple peak curves in cloudy days. The sap flow rates were significantly decreased by drought and the peak value appeared early with drought. Sap flow after rewatering showed minor difference from the control, but the values were lower than those of the control and the peak value appeared earlier than the control. In addition, the average sap flow rate at jointing to silking stage was highest in the control, followed by under severe stress and then under moderate stress; At silking to milk and milk to mature stages, it was the highest in the control, followed by under moderate stress and then under severe stress. Also, the plant sap flow of maize showed good response to environmental factors such as net radiation, air temperature and relative humidity. The stress of soil moisture affected the sap flow rate, and reduced the effect of relative humidity on the sap flow rate. |
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