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,(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
  
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)
作者单位
陈飞 State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China 
李鸿平 State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China 
崔宁博 State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China 
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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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