| 引用本文: | 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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| 摘要: |
| 【目的】探明滴灌芹菜的叶片膨压变化特征及其影响因素。【方法】采用叶片膨压探针在线监测充分灌溉（FI）和非充分灌溉（NI）下的滴灌芹菜叶片膨压变化参数（Pp、Pp*），同步记录相关温室环境因子与植物典型水分生理指标，分析膨压变化参数（Pp、Pp*）在不同灌水条件下的变化特征，并利用多元回归、通径分析和时间错位法探讨叶片膨压变化对各影响因素的响应。【结果】1）不同处理及不同生育期的典型晴日下，芹菜叶片Pp*均呈昼高夜低的单峰型日变化趋势，但NI处理的Pp*启动时间较FI处理提前，且其峰值较FI处理高39.3%~66.7%。2）不同灌水处理下，Pp*与气孔导度（Gs）、蒸腾速率（Tr）的日变化趋势相同，且呈正相关；Pp*与叶水势（Ψ）呈负相关。3）灌溉能显著影响芹菜叶片膨压变化，不同处理灌水前Pp峰值和谷值逐渐上升，灌水后二者迅速下降，但NI处理下的Pp变化幅度更剧烈。4）典型晴日不同处理下，芹菜叶片Pp*与大气温度（TA）、饱和水汽压差（VPD）显著正相关，与相对湿度（RH）、风速（WS）显著负相关。通径分析显示，TA对Pp*的直接影响最显著，VPD对Pp*的间接影响最显著。而逐步回归结果表明，WS对Pp*的影响只在NI处理下显著。各生育期Pp*与TA间均存在时滞效应，但NI处理下二者的时滞时间较FI处理增长了10~30 min，形成的时滞圈面积增大4%~9.5%。【结论】综上，芹菜叶片膨压变化特征与灌溉条件、气象因子密切相关，水分供应不足时膨压变化参数的峰值增大，与温度的时滞效应增强。 |
| 关键词: 芹菜；膨压探针；气孔导度；叶水势；气象因子 |
| DOI： |
| 分类号:S274.3 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）；山西省水利发展中心项目 |
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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 |
