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| Effects of drought-waterlogging stress and environmental factor on sap flow of tomato under rain shelter |
| DENG Sheng1, YU Lei1, SHAO Guangcheng2, KONG Qiongju1, LU Jianghai1 |
| 1.Institute of Rural Water, Jiangxi Institute of Hydraulic Research, Nanchang, Jiangxi 330029, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract Based on pot cultivation experimental data of tomato under rain shelter, the diurnal variation of sap flow velocity is analyzed at different irrigation amounts and under various weather conditions. The environmental factor, i.e. independent variable, includes solar radiation, ambient temperature, air relative humidity and soil moisture. The sap flow velocity is correlated to these factors by using path analysis and grey relational analysis, the correlation coefficient, coefficient of determination and grey relational degree have been determined. The results indicate that the diurnal variation of sap flow changes significantly under different weather conditions. Particularly, it presents a single-peak curve on sunny day, but bimodal peak one at 10:00 and 14:00 on cloudy day. The sap flow is small and shows a little fluctuation in the rain. A diurnal variation curve of sap flow of at different irrigation amounts can reflect the status of drought hardening and waterlogging, and a slight deficit can resist waterlogging to improve sap flow. Unfortunately, once the deficit is beyond a certain limit, it can reduce the flow significantly. Solar radiation is the most sensitive factor affecting the sap flow because its coefficient of determination is as high as 0.91. Both methods have achieved consistent results.
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Received: 22 August 2015
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