中国农业气象

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LED绿光对生菜生长和品质的影响

王晓晶,陈晓丽,郭文忠,李海平,李灵芝   

  1. 1.山西农业大学园艺学院,太谷 030801;2.北京农业智能装备技术研究中心,北京 100097
  • 出版日期:2019-01-20 发布日期:2019-01-22
  • 作者简介:王晓晶(1993?),女,硕士生,研究方向为蔬菜栽培与生理。E-mail:wangxj0229@163.com
  • 基金资助:

    北京市自然科学基金项目(6174041);国家重点研发计划(2017YFD0201503)

Effects of LED Green Light on Growth and Quality of Lettuce

WANG Xiao-jing, CHEN Xiao-li, GUO Wen-zhong, LI Hai-ping, LI Ling-zhi   

  1. 1.College of Horticulture, Shanxi Agricultural University, Taigu 030801, China; 2.Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097
  • Online:2019-01-20 Published:2019-01-22

摘要:

在全人工光型植物工厂内以水培奶油生菜(Lactuca sativa L.)为试验材料,运用光质及光强可调节的LED植物生长灯,以8:00-24:00照射强度为200μmol·m-2·s-1的白光为基础光(对照W),依次以强度为50(WG50)、100(WG100)、150μmol·m?2·s?1(WG150)的绿光取代相等强度的白光照射生菜,并测定生菜叶片生物量、形态、叶片数以及叶绿素、硝态氮、维生素C、可溶性糖、粗纤维和淀粉的含量,以探究绿光对生菜生长及品质的影响,为LED绿光的供光策略提供参考。结果表明:(1)在50μmol·m-2·s-1的绿光处理下,生菜地上部叶绿素含量显著高于对照,地上部干重较对照提高3.69%。(2)随着绿光强度的增加和基础白光强度的减弱,生菜地上部可溶性糖和维生素C含量均呈现先升高后降低的趋势,二者均在WG50处理下达到最高,并显著高于对照(P<0.05),而在WG150处理下达到最低,并显著低于对照(P<0.05)。(3)与对照相比,绿光处理均降低了生菜叶片中淀粉、粗纤维以及硝酸盐的含量,其中硝酸盐含量在WG50处理下达到最低。说明50μmol·m-2·s-1强度的绿光有促进生菜干物质积累以及提升生菜品质的作用。

关键词: 植物工厂, LED, 绿光, 白光, 生菜

Abstract:

The experiment was conducted in a closed plant factory with artificial light. Lettuce (Lactuca sativa L.) hydroponically cultured was used as materials, and the light intensity and quality were both adjustable. White light provided at 8:00-24:00 with light intensity of 200μmol·m-2·s-1 was regarded as control (W), and green light with light intensity of 50 (WG50), 100 (WG100) and 150μmol·m-2·s-1 (WG150) was respectively used instead of equal white light. Lettuce biomass, morphology, leaf number, and the contents of chlorophyll, nitrate nitrogen, vitamin C, soluble sugar, crude fiber and starch were determined, to investigate the effects of green light on the growth and quality of lettuce and explore better supply modes for green light. The results showed that: (1)the WG50 treatment significantly increased the chlorophyll content in lettuce shoot and also enhanced the dry weight of lettuce shoot by 3.69% compared with the control. (2) With the increase of green light and the decrease of basic white light, the soluble sugar and vitamin C contents in lettuce shoot rose first and then declined. The highest and lowest content of both the two indices were respectively detected under WG50 and WG150 treatment, the differences in comparison of the control reaching significant level (P<0.05). (3) Compared with the control, all the treatments with green light reduced the contents of starch, crude fiber and nitrate in lettuce leaves. The lowest nitrate content was observed in lettuce treated with WG50. In summary, green light with the intensity of 50μmol·m-2·s-1 might promote the accumulation of dry matter in lettuce and improve the quality of lettuce.

Key words: Plant factory, LED, Green light, White light, Lettuce