欧美杨幼苗对不同光照时长的响应
Growth of Populus×euramericana Plantlet under Different Light Durations
[目的]为了明确不同光照时长在杨树早期育苗过程中对其幼苗生长的影响。[方法]本文以16个欧美杨无性系幼苗为研究对象,利用全光谱LED灯设计11 h、12 h、13 h、14 h、15 h和自然光(CK)六个光照处理。进行了150 d的光照处理实验,每隔15 d对幼苗的苗高(H),地径(GD),节数(NN),叶片数(NL)和叶片相对叶绿素含量(SPAD值)进行调查和测量。通过建立并筛选生长模型的方式展示欧美杨幼苗对不同光照时长的响应,同时对其生长节律和SPAD值进行统计学分析。[结果]结果表明:光照时长对欧美杨幼苗的苗高和地径存在显著影响,它们的生长与光照时长存在正相关关系。短的全光谱LED光照时长会影响节律进而使高生长提前停止,地径的生长则不会因光照时长的减少而停止。对比不同的生长曲线拟合模型发现,对于LED灯下的欧美杨幼苗生长,Gomperz模型的拟合效果最好,R2 均在 0.89 以上,表明该拟合模型对不同光照时长下的欧美杨幼苗生长的解释度较高。长光照时长处理下的欧美杨生长潜力更大,速生持续时间也变的更长。节数增加的停止时间随光照时间的延长而延后。与自然光相比,LED光会致使欧美杨幼苗的叶片数量减少。14 h及以上的光照时长会降低欧美杨幼苗的SPAD值。[结论]光照质量和光照时间都是温室育苗过程中应该注意的环境因素。在实际生产时,自然光条件下适当的增加和补充人工光可以更好的提高欧美杨的早期育苗效率。
[Objective]The aim of this study was to investigate the effect of different light duration on the growth of Populus plantlets during the early seedling raising process.[Method]In this paper,16 seedlings of Populus×euramericana clones were taken as research objects,using full-spectrum LED lights,six light treatments of 11 h,12 h,13 h,14 h,15 h,and CK(greenhouse natural light)were designed to examine the response of Populus×euramericana plantlets to light duration in the greenhouse.Every 15 days during the 150-day experiment,plantlet height(H),ground diameter(GD),number of nodes(NN),number of leaves(NL),and the relative chlorophyll content(SPAD)of Populus×euramericana plantlets were measured.The response of plantlets to different light durations was demonstrated by establishing and screening growth models,and rhythm and relative chlorophyll content were statistically analyzed.[Result]The light duration had a significant effect on the H and GD of Populus×euramericana plantlets,and their growth was positively correlated with light duration.The short fullspectrum LED lighting duration will affect the rhythm and prematurely halt the growth of H,but the GD will continue to expand.Comparing the fitting models of different growth curves,it was found that the Gomperz model has the best fitting effect for the growth of Populus×euramericana plantlets under LED lighting,with all R2s values greater than 0.89.The results showed that the Gomperz fitting model explained the growth of Populus×euramericana plantlets under different light durations.Long light duration has a greater growth potential,and the rapid growth lasts longer.The delay in the cessation of the increase in the NN was a result of the increased illumination time.Compared with natural light,LED light lessens the NL.Populus×euramericana plantlets will have a lower SPAD value if the light duration exceeds 14 h.[Conclusion]In the process of growing plantlets in the greenhouse,both light quality and light duration should be considered.In actual production,appropriate increase and supplement of artificial light under natural light conditions can better improve the early seedling efficiency of Populus×euramericana.
刘成功;刘宁;丁昌俊;刘粉粉;苏晓华;黄秦军;
中国林业科学研究院林业研究所 北京 100091##国家林业和草原局林木育种与培育重点实验室 北京 100091;中国林业科学研究院林业研究所 北京 100091;中国林业科学研究院林业研究所 北京 100091##国家林业和草原局林木育种与培育重点实验室 北京 100091;中国林业科学研究院林业研究所 北京 100091##国家林业和草原局林木育种与培育重点实验室 北京 100091;中国林业科学研究院林业研究所 北京 100091##国家林业和草原局林木育种与培育重点实验室 北京 100091;中国林业科学研究院林业研究所 北京 100091##国家林业和草原局林木育种与培育重点实验室 北京 100091;
Populus×euramericana light duration plantlets growth model rhythm SPAD value.
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