| Cite this article: | 许全悦,郑利剑,孙西欢,等.滴灌条件下芹菜叶片膨压变化特征及其影响因素研究[J].灌溉排水学报,2022,(12):-. |
| XuQuanyue,ZhengLijian,SunXihuan,et al.滴灌条件下芹菜叶片膨压变化特征及其影响因素研究[J].灌溉排水学报,2022,(12):-. |
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| Characteristics and Influencing Factors of Celery Leaf Turgor Pressure under Drip Irrigation |
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XuQuanyue1, ZhengLijian1, SunXihuan1, LiXiaojian2, MaJuanjuan1, GuoXianghong1, GuoYong1
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1.Taiyuan University of Technology;2.Shanxi Water Conservancy Development Center
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| Abstract: |
| 【Objective】 This research was to investigate the characteristics and influencing factors of leaf turgor pressure of greenhouse celery under drip irrigation. Then it could provide a theoretical basis for the construction of diagnostic method for moisture condition of celery. 【Method】 This study was focused on greenhouse celery under different drip irrigation treatments, which set as full irrigation (FI) and non-full irrigation (NI). Leaf turgor pressure probes were used to continuously measure the turgor pressure variable parameters (Pp, Pp*) during the celery-growing season. Besides, environment factors and typical plant water physiological indexes were measured simultaneously. Then, the variation characteristics of Pp/Pp* under different irrigation conditions were analyzed, and the response of leaf turgor pressure to influencing factors was explored by multiple regression, path analysis and time warping method.【Result】 (1) The Pp* of celery reached its maximum at daytime and reached the minimum at night on typical sunny days. The Pp* values of celery leaf exhibited a single-peak curves with different growth stages for both irrigation treatments. However, the start-up time in Pp* was earlier for NI treatment than in FI treatment, and the peak value in Pp* of NI was 39.3%~66.7% higher. (2) Under different irrigation conditions, the diurnal trend of Pp* was similar with stomatal conductance (Gs) and transpiration rate (Tr), and Pp* had positively relationship to Gs and Tr. But Pp* negatively correlated with leaf water potential (Ψ). (3) The changed characteristic of leaf turgor pressure was obviously different among irrigation treatments. The peak and valley values of Pp increased gradually before irrigation and decreased rapidly after irrigation, and the variation amplitude of Pp in NI was more drastic. (4) There was a remarkable positively correlation between Pp* and atmospheric temperature (TA), vapour pressure deficit (VPD), while relative humidity (RH) and windspeed (WS) were negatively effected Pp* of celery. Path analysis showed that the highest correlation coefficient was found between Pp* and TA, and VPD was the indirect factor affecting Pp*. The results of stepwise regression analysis indicated that WS had significant effect on Pp* only in NI. In addition, the hysteresis effect between TA and Pp* was existed in different growth stage. But the hysteresis time of NI was 10~30 min longer than FI, and the area of hysteresis loop in NI was 4%~9.5% larger than FI. 【Conclusion】 In conclusion, variation of leaf turgor pressure in celery is closely related to irrigation conditions and meteorological factors, and peak value of turgor pressure variation parameter and hysteresis effect of atmospheric temperature were reinforced under insufficient irrigation condition. |
| Key words: celery; turgor probe; stomatal conductance; leaf water potential; meteorological factors |
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