| Diurnal change and influencing factors of winter wheat's leaf water potential during grain filling stage under sprinkler irrigation condition |
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| DOI：10.7606/j.issn.1000-7601.2009.04.01 |
| Key Words: sprinkler irrigation surface irrigation leaf water potential ecological factor physiological factor |
| Author Name | Affiliation | | YAO Sumei | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China
School of Life Science and Technology, He'nan Institute of Science and Technology, Xinxiang, He'nan 453003, China | | KANG Yaohu | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China | | LIU Haijun | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: |
| Using Zhongyou 9507 as experiment material，the diurnal change of leaf water potential of winter wheat during grain filling stage under sprinkler irrigation and surface irrigation conditions was studied, and the relationships between leaf water potential and ecological factors(including canopy air temperature, relative humidity), physiological factors(including stomatic conductance, the transpiration rate，intercellular CO2 concentration, and the photosynthesis rate) were analyzed. The results were as follows: Compared with that under surface irrigation condition, the variability pattern of diurnal curve of leaf water potential under sprinkler irrigation condition was not significantly changed. However, the v
alues of leaf water potential were remarkably higher under sprinkler irrigation than those under surface irrigation condition. In the early and middle grain filling stage, the highest difference of leaf water potential during 8∶00～18∶00 between sprinkler irrigation and surface irrigation conditions appeared on 8∶00 and 12∶00～16∶00, respectively, while in the late grain filling stage, the differences during 8∶00～18∶00 were not significant. Compared with those under surface irrigation condition, the major influencing factors of winter wheat's leaf water potential under sprinkler irrigation condition were not changed. Stepwise analysis showed that canopy air temperature, relative humidity were the primary influencing factors for the leaf water potential during early grain filling stage, and canopy air temperature, relative humidity, the transpiration rate were the primary influencing factors during middle grain filling stage, while the photosynthesis rate were the primary influencing factor during late grain filling stage. The primary influencing factors' impacting degree for the leaf water potential declined under sprinkler irrigation compared with surface irrigation, which indicated that the sensitivity of the leaf water potential to the variation of the primary influencing factors decreased. |
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