| 陈飞,李鸿平,崔宁博.滴灌水分亏缺对柑橘前期光合特性的影响[J].干旱地区农业研究,2021,39(3):42~50 |
| 滴灌水分亏缺对柑橘前期光合特性的影响 |
| The effect of water deficit on photosynthesis of citrus under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2021.03.06 |
| 中文关键词: 柑橘 水分亏缺 复水 光合特性 滴灌 |
| 英文关键词:citrus water deficit re\|watering photosynthetic characteristics drip irrigation |
| 基金项目:“十三五”国家重点研发计划（2016YFC0400206-03）；国家自然科学基金委优秀青年科学基金项目（51922072）；国家自然科学基金（51779161,51009101）；中央高校基本科研业务费专项资金（2018CDPZH-10，2016CDDY-S04-SCU，2017CDLZ-N22） |
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| 中文摘要: |
| 为揭示滴灌水分亏缺及复水对柑橘叶片光合特性的调控效应，以9 a生‘不知火’柑橘为试材，在抽梢开花期（I期）、幼果期（II期）各设置4个亏水处理，即轻度亏水（LD）、中度亏水（MD1）、偏重度亏水（MD2）和重度亏水（SD）处理，灌水定额分别为对照的85%、70%、55%和40%，并设置1个对照处理（CK），分析柑橘叶片光合特性对滴灌水分亏缺及复水的响应规律。结果表明：与CK相比，I期和II期不同水分亏缺处理下的Pn分别下降了4.5%~28.4%和6.2%~42.9%，除轻度亏水（LD）外差异显著（P＜0.05）；瞬时水分利用效率（WUEi）均高于CK，分别在I-MD1和II-LD取得最大值，与CK相比分别提高14.0%和14.4%，差异显著（P＜0.05)。复水后不同处理Pn、Gs、Tr均有明显的提高；与亏水状态时比，I期和II期Pn分别增加了68.2%~85.1%和22.1%~44.0%；轻度亏水（I-LD和II-LD）后复水出现了超补偿效应，Pn、WUEi均高于CK，分别增加了6.4%、16.2%和5.8%、16.1%（P＜0.05）。因此，滴灌柑橘I期和II期进行轻度亏水（LD）处理在保证较高Pn和WUEi条件下可节约15%灌溉用水，是柑橘早期适宜的滴灌水分亏缺模式。 |
| 英文摘要: |
| In order to reveal the regulation effect of drip irrigation on photosynthetic characteristics of citrus leaves, 9-year-old ‘Shiranui’ citrus was used as the test material. A total of 4 water deficit treatments were designed in 2 stages of citrus, flowering stage (I) and young fruit stage (II). Meanwhile, the treatment without water deficit was considered as the control. The 4 water deficit treatments included 85% of irrigation amount (slight water deficit, LD), 70% of irrigation amount (moderate water deficit, MD1), 55% of irrigation amount (mild water deficit, MD2), and 40% of irrigation amount (severe water deficit, SD) of control. The response of photosynthetic characteristics of citrus leaves to water deficit and re\|watering was analyzed. Compared with the control treatment, Pn decreased significantly by 4.5%~28.4% and 6.2%~42.9% in stages I and II, respectively,except with LD (P<0.05). WUEi of different treatments was higher than that of CK, and the maximum values were obtained at I-MD1 and II-LD, respectively, which were 14.0% and 14.4% higher than that of CK（P＜0.05). After re\|watering, Pn, Gs, and Tr of different treatments were significantly increased. Compared with the state of water deficit, Pn in phases I and II increased by 68.2%~85.1% and 22.1%~44.0%, respectively. Re\|watering after slight water deficit had over compensation effect. Pn and WUEi of slight water deficit (I-LD and II-LD)were higher than that of CK, increased by 6.4% and 16.2%(I-LD), and 5.8% and 16.1%(I-LD), respectively.Therefore, slight water deficit (LD) treatment in stages I and II of citrus not only ensured high Pn and WUEi but also saved 15% irrigation water, which is a suitable water deficit model for citrus. |
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