LED光照强度对高羊茅生长及生理特性的影响

Effects of the light intensity of LEDs on the growth and physiological characteristics of tall fescue

为通过LED光源在适宜光照强度下培育高质量草坪,本研究以高羊茅(Festuca arundinacea)品种‘交战4’为试验材料,在LED红蓝光源下设置100(L100)、150(L150)、200(L200)、250(L250)、300(L300)、350(L350)μmol·(m^(2)·s)^(-1)的光照强度处理,研究不同光照强度对高羊茅形态建成、生理特性和电能利用效率的影响。结果表明,光照强度低于200μmol·(m^(2)·s)^(-1)时,明显抑制高羊茅形态建成、营养物质积累和抗氧化能力。随着光照强度的增加,高羊茅归一化植被指数和色泽逐渐提升,根系生长更为强壮,有利于高羊茅的生物量积累和抗氧化能力增强。但当光照强度增加至300μmol·(m^(2)·s)^(-1)时,光照强度对高羊茅生长的促进效果减弱。利用LED培育高羊茅电能利用效率在L350处理显著低于L100、L150、L300处理。回归分析显示,在光照强度为291.25μmol·(m^(2)·s)^(-1)时[接近300μmol·(m^(2)·s)^(-1)],高羊茅归一化植被指数最大。因此,综合认为选择光照强度为300μmol·(m^(2)·s)^(-1)时,可以满足高羊茅的正常生长,保持较高的草坪质量,减少能源的消耗。

To determine the optimal conditions for cultivating high-quality lawn under suitable light intensity using an LED light source,the effects of different light intensities on the morphology,physiological characteristics and power utilization efficiency of tall fescue were studied.To this end,tall fescue variety‘Battle 4’was used as the test material,with light intensity treatments of 100(L100),150(L150),200(L200),250(L250),300(L300),and 350(L350)μmol·(m^(2)·s)^(-1) under a red and blue LED light source.The results showed that when the light intensity was lower than 200μmol·(m^(2)·s)^(-1),the morphology,nutrient accumulation,and antioxidant capacity of tall fescue was significantly inhibited.As the light intensity increased,the normalized difference vegetation index(NDVI)and color of tall fescue gradually increased.In addition,root growth became stronger,which is conducive to biomass accumulation and the antioxidant capacity of tall fescue.However,when the light intensity was increased to 300μmol·(m^(2)·s)^(-1),the effect of light intensity on the growth of tall fescue was weakened.The high power utilization efficiency of using LED cultivation was significantly lower in L350 processing than that of L100,L150,and L300.Regression analysis indicated that the normalized vegetation index of tall fescue was highest at a light intensity of 291.25μmol·(m^(2)·s)^(-1)[close to 300μmol·(m^(2)·s)^(-1)].These results suggest that a light intensity of 300μmol·(m^(2)·s)^(-1) is sufficient to ensure the normal growth of tall fescue and maintain high turf quality while reducing energy consumption.