摘要
LED光源以其节能环保、光参数可控等优势成为植物生长首选补光光源,在水培牧草培养箱中得到有效利用。本文利用水培技术在植物生长培育中的优势,以大麦草为试验对象,开展光强和光周期的试验研究。牧草培育过程分为种子萌发和麦草生长两个阶段,其中种子萌发期间培养箱内温度设为28℃,相对湿度控制在80%以上,黑暗条件下催芽3 d;麦草生长期间培养箱内温度设为26℃,相对湿度控制在60%~80%,采用峰值波长分别为660 nm和445 nm大功率红、蓝LED光源,其红光与蓝光的光强比为7∶3,采用控制变量法,分别探究不同光强和光周期对大麦草生长速率的影响。试验结果表明:当光周期固定为12 h·d^-1,光强从150~900μmol·m^-2·s^-1逐渐增加的过程中,大麦草生长速率的各项评价指标均呈现先升高后降低的趋势,其中株高、平均叶面积、鲜重、干重和叶绿素含量均在600μmol·m^-2·s^-1达到最大值;当光强固定为600μmol·m^-2·s^-1,分别在4 h·d^-1、8 h·d^-1、12 h·d^-1、16 h·d^-1、20 h·d^-1、24 h·d^-1的光周期下进行试验,发现16 h·d^-1的光周期下大麦草生长速率评价指标值最高、长势最好。据此可以确定适合大麦草高效生长的LED光照环境,此试验结果将为大规模、全天候、自动化牧草培养箱的设计提供数据支持。
With its advantages of energy saving,environmental protection,and controllable light parameters,LED light source has become the preferred light source for plant growth and is effectively used in hydroponic pasture incubators.In this paper,the advantages of hydroponic technology in plant growth and cultivation are used,and barley grass is used as the test object to carry out the experimental study of light intensity and photoperiod.The forage planting process is divided into two stages:seed germination and wheat straw growth.During germination of seeds,the temperature in the incubator was set to 28℃,the relative humidity was controlled above 80%,and germination was induced for 3 days in the dark.During the growth of wheat stalks,the temperature of the incubator is set to 26℃,the relative humidity is controlled at 60 to 80%,high-power red and blue LED light sources with peak wavelengths of 660 nm and 445 nm are used.The intensity ratio of red light to blue light is 7∶3.Using the method of controlling variables to explore the effect of different light intensity and photoperiod on the growth rate of barley grass.When the photoperiod is fixed at 12 h·d^-1 and the light intensity increases from 150μmol·m^-2·s^-1 to 900μmol·m^-2·s^-1,all the indicators related to the growth rate of barley grass are showed a trend of increasing first and then decreasing.The plant height,average leaf area,fresh weight,dry weight and chlorophyll content all reached the maximum when the light intensity was 600μmol·m^-2·s^-1;when the light intensity was fixed at 600μmol·m^-2·s^-1,the experiments were conducted under the photoperiods of 4,8,12,16,20 h·d^-1 and 24 h·d^-1,respectively.Experiments show that under the photoperiod of 16 h·d^-1,the index values related to the growth rate of barley grass are the highest,and the growth of barley grass is the best.Based on this,the LED lighting environment suitable for the efficient growth of barley grass can be determined,and the experimental results will provide data support for the design of large-scale,all-weather,automated forage grass incubators.
作者
万茂科
苗洪利
程广壮
孙九胜
杨金钰
乔小燕
WAN Maoke;MIAO Hongli;CHENG Guangzhuang;SUN Jiusheng;YANG Jinyu;QIAO Xiaoyan(College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China;Institute of Soil Fertilizer and Agricultural Water Conservation, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China)
出处
《照明工程学报》
2020年第4期145-151,共7页
China Illuminating Engineering Journal
基金
国家重点研发计划——政府间国际科技创新合作重点专项《全可控环境条件下水培牧草高效生产技术引进试验与示范》(编号:2016YFE0109100)。
关键词
LED
光质
光强
光周期
大麦草
培养箱
LED
light quality
light intensity
photoperiod
barley grass
incubator
作者简介
通讯作者:苗洪利,E-mail:oumhl@ouc.edu.cn。
